cassandra.yaml

 # Cassandra storage config YAML
   2
   3 # NOTE:
   4 #   See http://wiki.apache.org/cassandra/StorageConfiguration for
   5 #   full explanations of configuration directives
   6 # /NOTE
   7
   8 # The name of the cluster. This is mainly used to prevent machines in
   9 # one logical cluster from joining another.
  10 cluster_name: 'Test Cluster'
  11
  12 # This defines the number of tokens randomly assigned to this node on the ring
  13 # The more tokens, relative to other nodes, the larger the proportion of data
  14 # that this node will store. You probably want all nodes to have the same number
  15 # of tokens assuming they have equal hardware capability.
  16 #
  17 # If you leave this unspecified, Cassandra will use the default of 1 token for legacy compatibility,
  18 # and will use the initial_token as described below.
  19 #
  20 # Specifying initial_token will override this setting on the node's initial start,
  21 # on subsequent starts, this setting will apply even if initial token is set.
  22 #
  23 # If you already have a cluster with 1 token per node, and wish to migrate to
  24 # multiple tokens per node, see http://wiki.apache.org/cassandra/Operations
  25 num_tokens: 256
  26
  27 # Triggers automatic allocation of num_tokens tokens for this node. The allocation
  28 # algorithm attempts to choose tokens in a way that optimizes replicated load over
  29 # the nodes in the datacenter for the replication strategy used by the specified
  30 # keyspace.
  31 #
  32 # The load assigned to each node will be close to proportional to its number of
  33 # vnodes.
  34 #
  35 # Only supported with the Murmur3Partitioner.
  36 # allocate_tokens_for_keyspace: KEYSPACE
  37
  38 # initial_token allows you to specify tokens manually.  While you can use it with
  39 # vnodes (num_tokens > 1, above) -- in which case you should provide a
  40 # comma-separated list -- it's primarily used when adding nodes to legacy clusters
  41 # that do not have vnodes enabled.
  42 # initial_token:
  43
  44 # See http://wiki.apache.org/cassandra/HintedHandoff
  45 # May either be "true" or "false" to enable globally
  46 hinted_handoff_enabled: true
  47
  48 # When hinted_handoff_enabled is true, a black list of data centers that will not
  49 # perform hinted handoff
  50 # hinted_handoff_disabled_datacenters:
  51 #    - DC1
  52 #    - DC2
  53
  54 # this defines the maximum amount of time a dead host will have hints
  55 # generated.  After it has been dead this long, new hints for it will not be
  56 # created until it has been seen alive and gone down again.
  57 max_hint_window_in_ms: 10800000 # 3 hours
  58
  59 # Maximum throttle in KBs per second, per delivery thread.  This will be
  60 # reduced proportionally to the number of nodes in the cluster.  (If there
  61 # are two nodes in the cluster, each delivery thread will use the maximum
  62 # rate; if there are three, each will throttle to half of the maximum,
  63 # since we expect two nodes to be delivering hints simultaneously.)
  64 hinted_handoff_throttle_in_kb: 1024
  65
  66 # Number of threads with which to deliver hints;
  67 # Consider increasing this number when you have multi-dc deployments, since
  68 # cross-dc handoff tends to be slower
  69 max_hints_delivery_threads: 2
  70
  71 # Directory where Cassandra should store hints.
  72 # If not set, the default directory is $CASSANDRA_HOME/data/hints.
  73 # hints_directory: /var/lib/cassandra/hints
  74
  75 # How often hints should be flushed from the internal buffers to disk.
  76 # Will *not* trigger fsync.
  77 hints_flush_period_in_ms: 10000
  78
  79 # Maximum size for a single hints file, in megabytes.
  80 max_hints_file_size_in_mb: 128
  81
  82 # Compression to apply to the hint files. If omitted, hints files
  83 # will be written uncompressed. LZ4, Snappy, and Deflate compressors
  84 # are supported.
  85 #hints_compression:
  86 #   - class_name: LZ4Compressor
  87 #     parameters:
  88 #         -
  89
  90 # Maximum throttle in KBs per second, total. This will be
  91 # reduced proportionally to the number of nodes in the cluster.
  92 batchlog_replay_throttle_in_kb: 1024
  93
  94 # Authentication backend, implementing IAuthenticator; used to identify users
  95 # Out of the box, Cassandra provides org.apache.cassandra.auth.{AllowAllAuthenticator,
  96 # PasswordAuthenticator}.
  97 #
  98 # - AllowAllAuthenticator performs no checks - set it to disable authentication.
  99 # - PasswordAuthenticator relies on username/password pairs to authenticate
 100 #   users. It keeps usernames and hashed passwords in system_auth.credentials table.
 101 #   Please increase system_auth keyspace replication factor if you use this authenticator.
 102 #   If using PasswordAuthenticator, CassandraRoleManager must also be used (see below)
 103 authenticator: AllowAllAuthenticator
 104
 105 # Authorization backend, implementing IAuthorizer; used to limit access/provide permissions
 106 # Out of the box, Cassandra provides org.apache.cassandra.auth.{AllowAllAuthorizer,
 107 # CassandraAuthorizer}.
 108 #
 109 # - AllowAllAuthorizer allows any action to any user - set it to disable authorization.
 110 # - CassandraAuthorizer stores permissions in system_auth.permissions table. Please
 111 #   increase system_auth keyspace replication factor if you use this authorizer.
 112 authorizer: AllowAllAuthorizer
 113
 114 # Part of the Authentication & Authorization backend, implementing IRoleManager; used
 115 # to maintain grants and memberships between roles.
 116 # Out of the box, Cassandra provides org.apache.cassandra.auth.CassandraRoleManager,
 117 # which stores role information in the system_auth keyspace. Most functions of the
 118 # IRoleManager require an authenticated login, so unless the configured IAuthenticator
 119 # actually implements authentication, most of this functionality will be unavailable.
 120 #
 121 # - CassandraRoleManager stores role data in the system_auth keyspace. Please
 122 #   increase system_auth keyspace replication factor if you use this role manager.
 123 role_manager: CassandraRoleManager
 124
 125 # Validity period for roles cache (fetching granted roles can be an expensive
 126 # operation depending on the role manager, CassandraRoleManager is one example)
 127 # Granted roles are cached for authenticated sessions in AuthenticatedUser and
 128 # after the period specified here, become eligible for (async) reload.
 129 # Defaults to 2000, set to 0 to disable caching entirely.
 130 # Will be disabled automatically for AllowAllAuthenticator.
 131 roles_validity_in_ms: 2000
 132
 133 # Refresh interval for roles cache (if enabled).
 134 # After this interval, cache entries become eligible for refresh. Upon next
 135 # access, an async reload is scheduled and the old value returned until it
 136 # completes. If roles_validity_in_ms is non-zero, then this must be
 137 # also.
 138 # Defaults to the same value as roles_validity_in_ms.
 139 # roles_update_interval_in_ms: 2000
 140
 141 # Validity period for permissions cache (fetching permissions can be an
 142 # expensive operation depending on the authorizer, CassandraAuthorizer is
 143 # one example). Defaults to 2000, set to 0 to disable.
 144 # Will be disabled automatically for AllowAllAuthorizer.
 145 permissions_validity_in_ms: 2000
 146
 147 # Refresh interval for permissions cache (if enabled).
 148 # After this interval, cache entries become eligible for refresh. Upon next
 149 # access, an async reload is scheduled and the old value returned until it
 150 # completes. If permissions_validity_in_ms is non-zero, then this must be
 151 # also.
 152 # Defaults to the same value as permissions_validity_in_ms.
 153 # permissions_update_interval_in_ms: 2000
 154
 155 # Validity period for credentials cache. This cache is tightly coupled to
 156 # the provided PasswordAuthenticator implementation of IAuthenticator. If
 157 # another IAuthenticator implementation is configured, this cache will not
 158 # be automatically used and so the following settings will have no effect.
 159 # Please note, credentials are cached in their encrypted form, so while
 160 # activating this cache may reduce the number of queries made to the
 161 # underlying table, it may not  bring a significant reduction in the
 162 # latency of individual authentication attempts.
 163 # Defaults to 2000, set to 0 to disable credentials caching.
 164 credentials_validity_in_ms: 2000
 165
 166 # Refresh interval for credentials cache (if enabled).
 167 # After this interval, cache entries become eligible for refresh. Upon next
 168 # access, an async reload is scheduled and the old value returned until it
 169 # completes. If credentials_validity_in_ms is non-zero, then this must be
 170 # also.
 171 # Defaults to the same value as credentials_validity_in_ms.
 172 # credentials_update_interval_in_ms: 2000
 173
 174 # The partitioner is responsible for distributing groups of rows (by
 175 # partition key) across nodes in the cluster.  You should leave this
 176 # alone for new clusters.  The partitioner can NOT be changed without
 177 # reloading all data, so when upgrading you should set this to the
 178 # same partitioner you were already using.
 179 #
 180 # Besides Murmur3Partitioner, partitioners included for backwards
 181 # compatibility include RandomPartitioner, ByteOrderedPartitioner, and
 182 # OrderPreservingPartitioner.
 183 #
 184 partitioner: org.apache.cassandra.dht.Murmur3Partitioner
 185
 186 # Directories where Cassandra should store data on disk.  Cassandra
 187 # will spread data evenly across them, subject to the granularity of
 188 # the configured compaction strategy.
 189 # If not set, the default directory is $CASSANDRA_HOME/data/data.
 190 # data_file_directories:
 191 #     - /var/lib/cassandra/data
 192
 193 # commit log.  when running on magnetic HDD, this should be a
 194 # separate spindle than the data directories.
 195 # If not set, the default directory is $CASSANDRA_HOME/data/commitlog.
 196 # commitlog_directory: /var/lib/cassandra/commitlog
 197
 198 # Enable / disable CDC functionality on a per-node basis. This modifies the logic used
 199 # for write path allocation rejection (standard: never reject. cdc: reject Mutation
 200 # containing a CDC-enabled table if at space limit in cdc_raw_directory).
 201 cdc_enabled: false
 202
 203 # CommitLogSegments are moved to this directory on flush if cdc_enabled: true and the
 204 # segment contains mutations for a CDC-enabled table. This should be placed on a
 205 # separate spindle than the data directories. If not set, the default directory is
 206 # $CASSANDRA_HOME/data/cdc_raw.
 207 # cdc_raw_directory: /var/lib/cassandra/cdc_raw
 208
 209 # Policy for data disk failures:
 210 #
 211 # die
 212 #   shut down gossip and client transports and kill the JVM for any fs errors or
 213 #   single-sstable errors, so the node can be replaced.
 214 #
 215 # stop_paranoid
 216 #   shut down gossip and client transports even for single-sstable errors,
 217 #   kill the JVM for errors during startup.
 218 #
 219 # stop
 220 #   shut down gossip and client transports, leaving the node effectively dead, but
 221 #   can still be inspected via JMX, kill the JVM for errors during startup.
 222 #
 223 # best_effort
 224 #    stop using the failed disk and respond to requests based on
 225 #    remaining available sstables.  This means you WILL see obsolete
 226 #    data at CL.ONE!
 227 #
 228 # ignore
 229 #    ignore fatal errors and let requests fail, as in pre-1.2 Cassandra
 230 disk_failure_policy: stop
 231
 232 # Policy for commit disk failures:
 233 #
 234 # die
 235 #   shut down gossip and Thrift and kill the JVM, so the node can be replaced.
 236 #
 237 # stop
 238 #   shut down gossip and Thrift, leaving the node effectively dead, but
 239 #   can still be inspected via JMX.
 240 #
 241 # stop_commit
 242 #   shutdown the commit log, letting writes collect but
 243 #   continuing to service reads, as in pre-2.0.5 Cassandra
 244 #
 245 # ignore
 246 #   ignore fatal errors and let the batches fail
 247 commit_failure_policy: stop
 248
 249 # Maximum size of the native protocol prepared statement cache
 250 #
 251 # Valid values are either "auto" (omitting the value) or a value greater 0.
 252 #
 253 # Note that specifying a too large value will result in long running GCs and possbily
 254 # out-of-memory errors. Keep the value at a small fraction of the heap.
 255 #
 256 # If you constantly see "prepared statements discarded in the last minute because
 257 # cache limit reached" messages, the first step is to investigate the root cause
 258 # of these messages and check whether prepared statements are used correctly -
 259 # i.e. use bind markers for variable parts.
 260 #
 261 # Do only change the default value, if you really have more prepared statements than
 262 # fit in the cache. In most cases it is not neccessary to change this value.
 263 # Constantly re-preparing statements is a performance penalty.
 264 #
 265 # Default value ("auto") is 1/256th of the heap or 10MB, whichever is greater
 266 prepared_statements_cache_size_mb:
 267
 268 # Maximum size of the Thrift prepared statement cache
 269 #
 270 # If you do not use Thrift at all, it is safe to leave this value at "auto".
 271 #
 272 # See description of 'prepared_statements_cache_size_mb' above for more information.
 273 #
 274 # Default value ("auto") is 1/256th of the heap or 10MB, whichever is greater
 275 thrift_prepared_statements_cache_size_mb:
 276
 277 # Maximum size of the key cache in memory.
 278 #
 279 # Each key cache hit saves 1 seek and each row cache hit saves 2 seeks at the
 280 # minimum, sometimes more. The key cache is fairly tiny for the amount of
 281 # time it saves, so it's worthwhile to use it at large numbers.
 282 # The row cache saves even more time, but must contain the entire row,
 283 # so it is extremely space-intensive. It's best to only use the
 284 # row cache if you have hot rows or static rows.
 285 #
 286 # NOTE: if you reduce the size, you may not get you hottest keys loaded on startup.
 287 #
 288 # Default value is empty to make it "auto" (min(5% of Heap (in MB), 100MB)). Set to 0 to disable key cache.
 289 key_cache_size_in_mb:
 290
 291 # Duration in seconds after which Cassandra should
 292 # save the key cache. Caches are saved to saved_caches_directory as
 293 # specified in this configuration file.
 294 #
 295 # Saved caches greatly improve cold-start speeds, and is relatively cheap in
 296 # terms of I/O for the key cache. Row cache saving is much more expensive and
 297 # has limited use.
 298 #
 299 # Default is 14400 or 4 hours.
 300 key_cache_save_period: 14400
 301
 302 # Number of keys from the key cache to save
 303 # Disabled by default, meaning all keys are going to be saved
 304 # key_cache_keys_to_save: 100
 305
 306 # Row cache implementation class name. Available implementations:
 307 #
 308 # org.apache.cassandra.cache.OHCProvider
 309 #   Fully off-heap row cache implementation (default).
 310 #
 311 # org.apache.cassandra.cache.SerializingCacheProvider
 312 #   This is the row cache implementation availabile
 313 #   in previous releases of Cassandra.
 314 # row_cache_class_name: org.apache.cassandra.cache.OHCProvider
 315
 316 # Maximum size of the row cache in memory.
 317 # Please note that OHC cache implementation requires some additional off-heap memory to manage
 318 # the map structures and some in-flight memory during operations before/after cache entries can be
 319 # accounted against the cache capacity. This overhead is usually small compared to the whole capacity.
 320 # Do not specify more memory that the system can afford in the worst usual situation and leave some
 321 # headroom for OS block level cache. Do never allow your system to swap.
 322 #
 323 # Default value is 0, to disable row caching.
 324 row_cache_size_in_mb: 0
 325
 326 # Duration in seconds after which Cassandra should save the row cache.
 327 # Caches are saved to saved_caches_directory as specified in this configuration file.
 328 #
 329 # Saved caches greatly improve cold-start speeds, and is relatively cheap in
 330 # terms of I/O for the key cache. Row cache saving is much more expensive and
 331 # has limited use.
 332 #
 333 # Default is 0 to disable saving the row cache.
 334 row_cache_save_period: 0
 335
 336 # Number of keys from the row cache to save.
 337 # Specify 0 (which is the default), meaning all keys are going to be saved
 338 # row_cache_keys_to_save: 100
 339
 340 # Maximum size of the counter cache in memory.
 341 #
 342 # Counter cache helps to reduce counter locks' contention for hot counter cells.
 343 # In case of RF = 1 a counter cache hit will cause Cassandra to skip the read before
 344 # write entirely. With RF > 1 a counter cache hit will still help to reduce the duration
 345 # of the lock hold, helping with hot counter cell updates, but will not allow skipping
 346 # the read entirely. Only the local (clock, count) tuple of a counter cell is kept
 347 # in memory, not the whole counter, so it's relatively cheap.
 348 #
 349 # NOTE: if you reduce the size, you may not get you hottest keys loaded on startup.
 350 #
 351 # Default value is empty to make it "auto" (min(2.5% of Heap (in MB), 50MB)). Set to 0 to disable counter cache.
 352 # NOTE: if you perform counter deletes and rely on low gcgs, you should disable the counter cache.
 353 counter_cache_size_in_mb:
 354
 355 # Duration in seconds after which Cassandra should
 356 # save the counter cache (keys only). Caches are saved to saved_caches_directory as
 357 # specified in this configuration file.
 358 #
 359 # Default is 7200 or 2 hours.
 360 counter_cache_save_period: 7200
 361
 362 # Number of keys from the counter cache to save
 363 # Disabled by default, meaning all keys are going to be saved
 364 # counter_cache_keys_to_save: 100
 365
 366 # saved caches
 367 # If not set, the default directory is $CASSANDRA_HOME/data/saved_caches.
 368 # saved_caches_directory: /var/lib/cassandra/saved_caches
 369
 370 # commitlog_sync may be either "periodic" or "batch."
 371 #
 372 # When in batch mode, Cassandra won't ack writes until the commit log
 373 # has been fsynced to disk.  It will wait
 374 # commitlog_sync_batch_window_in_ms milliseconds between fsyncs.
 375 # This window should be kept short because the writer threads will
 376 # be unable to do extra work while waiting.  (You may need to increase
 377 # concurrent_writes for the same reason.)
 378 #
 379 # commitlog_sync: batch
 380 # commitlog_sync_batch_window_in_ms: 2
 381 #
 382 # the other option is "periodic" where writes may be acked immediately
 383 # and the CommitLog is simply synced every commitlog_sync_period_in_ms
 384 # milliseconds.
 385 commitlog_sync: periodic
 386 commitlog_sync_period_in_ms: 10000
 387
 388 # The size of the individual commitlog file segments.  A commitlog
 389 # segment may be archived, deleted, or recycled once all the data
 390 # in it (potentially from each columnfamily in the system) has been
 391 # flushed to sstables.
 392 #
 393 # The default size is 32, which is almost always fine, but if you are
 394 # archiving commitlog segments (see commitlog_archiving.properties),
 395 # then you probably want a finer granularity of archiving; 8 or 16 MB
 396 # is reasonable.
 397 # Max mutation size is also configurable via max_mutation_size_in_kb setting in
 398 # cassandra.yaml. The default is half the size commitlog_segment_size_in_mb * 1024.
 399 #
 400 # NOTE: If max_mutation_size_in_kb is set explicitly then commitlog_segment_size_in_mb must
 401 # be set to at least twice the size of max_mutation_size_in_kb / 1024
 402 #
 403 commitlog_segment_size_in_mb: 32
 404
 405 # Compression to apply to the commit log. If omitted, the commit log
 406 # will be written uncompressed.  LZ4, Snappy, and Deflate compressors
 407 # are supported.
 408 # commitlog_compression:
 409 #   - class_name: LZ4Compressor
 410 #     parameters:
 411 #         -
 412
 413 # any class that implements the SeedProvider interface and has a
 414 # constructor that takes a Map<String, String> of parameters will do.
 415 seed_provider:
 416     # Addresses of hosts that are deemed contact points.
 417     # Cassandra nodes use this list of hosts to find each other and learn
 418     # the topology of the ring.  You must change this if you are running
 419     # multiple nodes!
 420     - class_name: org.apache.cassandra.locator.SimpleSeedProvider
 421       parameters:
 422           # seeds is actually a comma-delimited list of addresses.
 423           # Ex: "<ip1>,<ip2>,<ip3>"
 424           - seeds: "172.15.81.249,172.15.14.106"
 425
 426 # For workloads with more data than can fit in memory, Cassandra's
 427 # bottleneck will be reads that need to fetch data from
 428 # disk. "concurrent_reads" should be set to (16 * number_of_drives) in
 429 # order to allow the operations to enqueue low enough in the stack
 430 # that the OS and drives can reorder them. Same applies to
 431 # "concurrent_counter_writes", since counter writes read the current
 432 # values before incrementing and writing them back.
 433 #
 434 # On the other hand, since writes are almost never IO bound, the ideal
 435 # number of "concurrent_writes" is dependent on the number of cores in
 436 # your system; (8 * number_of_cores) is a good rule of thumb.
 437 concurrent_reads: 32
 438 concurrent_writes: 32
 439 concurrent_counter_writes: 32
 440
 441 # For materialized view writes, as there is a read involved, so this should
 442 # be limited by the less of concurrent reads or concurrent writes.
 443 concurrent_materialized_view_writes: 32
 444
 445 # Maximum memory to use for sstable chunk cache and buffer pooling.
 446 # 32MB of this are reserved for pooling buffers, the rest is used as an
 447 # cache that holds uncompressed sstable chunks.
 448 # Defaults to the smaller of 1/4 of heap or 512MB. This pool is allocated off-heap,
 449 # so is in addition to the memory allocated for heap. The cache also has on-heap
 450 # overhead which is roughly 128 bytes per chunk (i.e. 0.2% of the reserved size
 451 # if the default 64k chunk size is used).
 452 # Memory is only allocated when needed.
 453 # file_cache_size_in_mb: 512
 454
 455 # Flag indicating whether to allocate on or off heap when the sstable buffer
 456 # pool is exhausted, that is when it has exceeded the maximum memory
 457 # file_cache_size_in_mb, beyond which it will not cache buffers but allocate on request.
 458
 459 # buffer_pool_use_heap_if_exhausted: true
 460
 461 # The strategy for optimizing disk read
 462 # Possible values are:
 463 # ssd (for solid state disks, the default)
 464 # spinning (for spinning disks)
 465 # disk_optimization_strategy: ssd
 466
 467 # Total permitted memory to use for memtables. Cassandra will stop
 468 # accepting writes when the limit is exceeded until a flush completes,
 469 # and will trigger a flush based on memtable_cleanup_threshold
 470 # If omitted, Cassandra will set both to 1/4 the size of the heap.
 471 # memtable_heap_space_in_mb: 2048
 472 # memtable_offheap_space_in_mb: 2048
 473
 474 # Ratio of occupied non-flushing memtable size to total permitted size
 475 # that will trigger a flush of the largest memtable. Larger mct will
 476 # mean larger flushes and hence less compaction, but also less concurrent
 477 # flush activity which can make it difficult to keep your disks fed
 478 # under heavy write load.
 479 #
 480 # memtable_cleanup_threshold defaults to 1 / (memtable_flush_writers + 1)
 481 # memtable_cleanup_threshold: 0.11
 482
 483 # Specify the way Cassandra allocates and manages memtable memory.
 484 # Options are:
 485 #
 486 # heap_buffers
 487 #   on heap nio buffers
 488 #
 489 # offheap_buffers
 490 #   off heap (direct) nio buffers
 491 #
 492 # offheap_objects
 493 #    off heap objects
 494 memtable_allocation_type: heap_buffers
 495
 496 # Total space to use for commit logs on disk.
 497 #
 498 # If space gets above this value, Cassandra will flush every dirty CF
 499 # in the oldest segment and remove it.  So a small total commitlog space
 500 # will tend to cause more flush activity on less-active columnfamilies.
 501 #
 502 # The default value is the smaller of 8192, and 1/4 of the total space
 503 # of the commitlog volume.
 504 #
 505 # commitlog_total_space_in_mb: 8192
 506
 507 # This sets the amount of memtable flush writer threads.  These will
 508 # be blocked by disk io, and each one will hold a memtable in memory
 509 # while blocked.
 510 #
 511 # memtable_flush_writers defaults to one per data_file_directory.
 512 #
 513 # If your data directories are backed by SSD, you can increase this, but
 514 # avoid having memtable_flush_writers * data_file_directories > number of cores
 515 #memtable_flush_writers: 1
 516
 517 # Total space to use for change-data-capture logs on disk.
 518 #
 519 # If space gets above this value, Cassandra will throw WriteTimeoutException
 520 # on Mutations including tables with CDC enabled. A CDCCompactor is responsible
 521 # for parsing the raw CDC logs and deleting them when parsing is completed.
 522 #
 523 # The default value is the min of 4096 mb and 1/8th of the total space
 524 # of the drive where cdc_raw_directory resides.
 525 # cdc_total_space_in_mb: 4096
 526
 527 # When we hit our cdc_raw limit and the CDCCompactor is either running behind
 528 # or experiencing backpressure, we check at the following interval to see if any
 529 # new space for cdc-tracked tables has been made available. Default to 250ms
 530 # cdc_free_space_check_interval_ms: 250
 531
 532 # A fixed memory pool size in MB for for SSTable index summaries. If left
 533 # empty, this will default to 5% of the heap size. If the memory usage of
 534 # all index summaries exceeds this limit, SSTables with low read rates will
 535 # shrink their index summaries in order to meet this limit.  However, this
 536 # is a best-effort process. In extreme conditions Cassandra may need to use
 537 # more than this amount of memory.
 538 index_summary_capacity_in_mb:
 539
 540 # How frequently index summaries should be resampled.  This is done
 541 # periodically to redistribute memory from the fixed-size pool to sstables
 542 # proportional their recent read rates.  Setting to -1 will disable this
 543 # process, leaving existing index summaries at their current sampling level.
 544 index_summary_resize_interval_in_minutes: 60
 545
 546 # Whether to, when doing sequential writing, fsync() at intervals in
 547 # order to force the operating system to flush the dirty
 548 # buffers. Enable this to avoid sudden dirty buffer flushing from
 549 # impacting read latencies. Almost always a good idea on SSDs; not
 550 # necessarily on platters.
 551 trickle_fsync: false
 552 trickle_fsync_interval_in_kb: 10240
 553
 554 # TCP port, for commands and data
 555 # For security reasons, you should not expose this port to the internet.  Firewall it if needed.
 556 storage_port: 7000
 557
 558 # SSL port, for encrypted communication.  Unused unless enabled in
 559 # encryption_options
 560 # For security reasons, you should not expose this port to the internet.  Firewall it if needed.
 561 ssl_storage_port: 7001
 562
 563 # Address or interface to bind to and tell other Cassandra nodes to connect to.
 564 # You _must_ change this if you want multiple nodes to be able to communicate!
 565 #
 566 # Set listen_address OR listen_interface, not both.
 567 #
 568 # Leaving it blank leaves it up to InetAddress.getLocalHost(). This
 569 # will always do the Right Thing _if_ the node is properly configured
 570 # (hostname, name resolution, etc), and the Right Thing is to use the
 571 # address associated with the hostname (it might not be).
 572 #
 573 # Setting listen_address to 0.0.0.0 is always wrong.
 574 #
 575 listen_address: 172.15.14.106
 576
 577 # Set listen_address OR listen_interface, not both. Interfaces must correspond
 578 # to a single address, IP aliasing is not supported.
 579 # listen_interface: eth0
 580
 581 # If you choose to specify the interface by name and the interface has an ipv4 and an ipv6 address
 582 # you can specify which should be chosen using listen_interface_prefer_ipv6. If false the first ipv4
 583 # address will be used. If true the first ipv6 address will be used. Defaults to false preferring
 584 # ipv4. If there is only one address it will be selected regardless of ipv4/ipv6.
 585 # listen_interface_prefer_ipv6: false
 586
 587 # Address to broadcast to other Cassandra nodes
 588 # Leaving this blank will set it to the same value as listen_address
 589 # broadcast_address: 1.2.3.4
 590
 591 # When using multiple physical network interfaces, set this
 592 # to true to listen on broadcast_address in addition to
 593 # the listen_address, allowing nodes to communicate in both
 594 # interfaces.
 595 # Ignore this property if the network configuration automatically
 596 # routes  between the public and private networks such as EC2.
 597 # listen_on_broadcast_address: false
 598
 599 # Internode authentication backend, implementing IInternodeAuthenticator;
 600 # used to allow/disallow connections from peer nodes.
 601 # internode_authenticator: org.apache.cassandra.auth.AllowAllInternodeAuthenticator
 602
 603 # Whether to start the native transport server.
 604 # Please note that the address on which the native transport is bound is the
 605 # same as the rpc_address. The port however is different and specified below.
 606 start_native_transport: true
 607 # port for the CQL native transport to listen for clients on
 608 # For security reasons, you should not expose this port to the internet.  Firewall it if needed.
 609 native_transport_port: 9042
 610 # Enabling native transport encryption in client_encryption_options allows you to either use
 611 # encryption for the standard port or to use a dedicated, additional port along with the unencrypted
 612 # standard native_transport_port.
 613 # Enabling client encryption and keeping native_transport_port_ssl disabled will use encryption
 614 # for native_transport_port. Setting native_transport_port_ssl to a different value
 615 # from native_transport_port will use encryption for native_transport_port_ssl while
 616 # keeping native_transport_port unencrypted.
 617 # native_transport_port_ssl: 9142
 618 # The maximum threads for handling requests when the native transport is used.
 619 # This is similar to rpc_max_threads though the default differs slightly (and
 620 # there is no native_transport_min_threads, idle threads will always be stopped
 621 # after 30 seconds).
 622 # native_transport_max_threads: 128
 623 #
 624 # The maximum size of allowed frame. Frame (requests) larger than this will
 625 # be rejected as invalid. The default is 256MB. If you're changing this parameter,
 626 # you may want to adjust max_value_size_in_mb accordingly.
 627 # native_transport_max_frame_size_in_mb: 256
 628
 629 # The maximum number of concurrent client connections.
 630 # The default is -1, which means unlimited.
 631 # native_transport_max_concurrent_connections: -1
 632
 633 # The maximum number of concurrent client connections per source ip.
 634 # The default is -1, which means unlimited.
 635 # native_transport_max_concurrent_connections_per_ip: -1
 636
 637 # Whether to start the thrift rpc server.
 638 start_rpc: true
 639
 640 # The address or interface to bind the Thrift RPC service and native transport
 641 # server to.
 642 #
 643 # Set rpc_address OR rpc_interface, not both.
 644 #
 645 # Leaving rpc_address blank has the same effect as on listen_address
 646 # (i.e. it will be based on the configured hostname of the node).
 647 #
 648 # Note that unlike listen_address, you can specify 0.0.0.0, but you must also
 649 # set broadcast_rpc_address to a value other than 0.0.0.0.
 650 #
 651 # For security reasons, you should not expose this port to the internet.  Firewall it if needed.
 652 rpc_address: 172.15.14.106
 653
 654 # Set rpc_address OR rpc_interface, not both. Interfaces must correspond
 655 # to a single address, IP aliasing is not supported.
 656 # rpc_interface: eth1
 657
 658 # If you choose to specify the interface by name and the interface has an ipv4 and an ipv6 address
 659 # you can specify which should be chosen using rpc_interface_prefer_ipv6. If false the first ipv4
 660 # address will be used. If true the first ipv6 address will be used. Defaults to false preferring
 661 # ipv4. If there is only one address it will be selected regardless of ipv4/ipv6.
 662 # rpc_interface_prefer_ipv6: false
 663
 664 # port for Thrift to listen for clients on
 665 rpc_port: 9160
 666
 667 # RPC address to broadcast to drivers and other Cassandra nodes. This cannot
 668 # be set to 0.0.0.0. If left blank, this will be set to the value of
 669 # rpc_address. If rpc_address is set to 0.0.0.0, broadcast_rpc_address must
 670 # be set.
 671 # broadcast_rpc_address: 1.2.3.4
 672
 673 # enable or disable keepalive on rpc/native connections
 674 rpc_keepalive: true
 675
 676 # Cassandra provides two out-of-the-box options for the RPC Server:
 677 #
 678 # sync
 679 #   One thread per thrift connection. For a very large number of clients, memory
 680 #   will be your limiting factor. On a 64 bit JVM, 180KB is the minimum stack size
 681 #   per thread, and that will correspond to your use of virtual memory (but physical memory
 682 #   may be limited depending on use of stack space).
 683 #
 684 # hsha
 685 #   Stands for "half synchronous, half asynchronous." All thrift clients are handled
 686 #   asynchronously using a small number of threads that does not vary with the amount
 687 #   of thrift clients (and thus scales well to many clients). The rpc requests are still
 688 #   synchronous (one thread per active request). If hsha is selected then it is essential
 689 #   that rpc_max_threads is changed from the default value of unlimited.
 690 #
 691 # The default is sync because on Windows hsha is about 30% slower.  On Linux,
 692 # sync/hsha performance is about the same, with hsha of course using less memory.
 693 #
 694 # Alternatively,  can provide your own RPC server by providing the fully-qualified class name
 695 # of an o.a.c.t.TServerFactory that can create an instance of it.
 696 rpc_server_type: sync
 697
 698 # Uncomment rpc_min|max_thread to set request pool size limits.
 699 #
 700 # Regardless of your choice of RPC server (see above), the number of maximum requests in the
 701 # RPC thread pool dictates how many concurrent requests are possible (but if you are using the sync
 702 # RPC server, it also dictates the number of clients that can be connected at all).
 703 #
 704 # The default is unlimited and thus provides no protection against clients overwhelming the server. You are
 705 # encouraged to set a maximum that makes sense for you in production, but do keep in mind that
 706 # rpc_max_threads represents the maximum number of client requests this server may execute concurrently.
 707 #
 708 # rpc_min_threads: 16
 709 # rpc_max_threads: 2048
 710
 711 # uncomment to set socket buffer sizes on rpc connections
 712 # rpc_send_buff_size_in_bytes:
 713 # rpc_recv_buff_size_in_bytes:
 714
 715 # Uncomment to set socket buffer size for internode communication
 716 # Note that when setting this, the buffer size is limited by net.core.wmem_max
 717 # and when not setting it it is defined by net.ipv4.tcp_wmem
 718 # See also:
 719 # /proc/sys/net/core/wmem_max
 720 # /proc/sys/net/core/rmem_max
 721 # /proc/sys/net/ipv4/tcp_wmem
 722 # /proc/sys/net/ipv4/tcp_wmem
 723 # and 'man tcp'
 724 # internode_send_buff_size_in_bytes:
 725
 726 # Uncomment to set socket buffer size for internode communication
 727 # Note that when setting this, the buffer size is limited by net.core.wmem_max
 728 # and when not setting it it is defined by net.ipv4.tcp_wmem
 729 # internode_recv_buff_size_in_bytes:
 730
 731 # Frame size for thrift (maximum message length).
 732 thrift_framed_transport_size_in_mb: 15
 733
 734 # Set to true to have Cassandra create a hard link to each sstable
 735 # flushed or streamed locally in a backups/ subdirectory of the
 736 # keyspace data.  Removing these links is the operator's
 737 # responsibility.
 738 incremental_backups: false
 739
 740 # Whether or not to take a snapshot before each compaction.  Be
 741 # careful using this option, since Cassandra won't clean up the
 742 # snapshots for you.  Mostly useful if you're paranoid when there
 743 # is a data format change.
 744 snapshot_before_compaction: false
 745
 746 # Whether or not a snapshot is taken of the data before keyspace truncation
 747 # or dropping of column families. The STRONGLY advised default of true
 748 # should be used to provide data safety. If you set this flag to false, you will
 749 # lose data on truncation or drop.
 750 auto_snapshot: true
 751
 752 # Granularity of the collation index of rows within a partition.
 753 # Increase if your rows are large, or if you have a very large
 754 # number of rows per partition.  The competing goals are these:
 755 #
 756 # - a smaller granularity means more index entries are generated
 757 #   and looking up rows withing the partition by collation column
 758 #   is faster
 759 # - but, Cassandra will keep the collation index in memory for hot
 760 #   rows (as part of the key cache), so a larger granularity means
 761 #   you can cache more hot rows
 762 column_index_size_in_kb: 64
 763
 764 # Per sstable indexed key cache entries (the collation index in memory
 765 # mentioned above) exceeding this size will not be held on heap.
 766 # This means that only partition information is held on heap and the
 767 # index entries are read from disk.
 768 #
 769 # Note that this size refers to the size of the
 770 # serialized index information and not the size of the partition.
 771 column_index_cache_size_in_kb: 2
 772
 773 # Number of simultaneous compactions to allow, NOT including
 774 # validation "compactions" for anti-entropy repair.  Simultaneous
 775 # compactions can help preserve read performance in a mixed read/write
 776 # workload, by mitigating the tendency of small sstables to accumulate
 777 # during a single long running compactions. The default is usually
 778 # fine and if you experience problems with compaction running too
 779 # slowly or too fast, you should look at
 780 # compaction_throughput_mb_per_sec first.
 781 #
 782 # concurrent_compactors defaults to the smaller of (number of disks,
 783 # number of cores), with a minimum of 2 and a maximum of 8.
 784 #
 785 # If your data directories are backed by SSD, you should increase this
 786 # to the number of cores.
 787 #concurrent_compactors: 1
 788
 789 # Throttles compaction to the given total throughput across the entire
 790 # system. The faster you insert data, the faster you need to compact in
 791 # order to keep the sstable count down, but in general, setting this to
 792 # 16 to 32 times the rate you are inserting data is more than sufficient.
 793 # Setting this to 0 disables throttling. Note that this account for all types
 794 # of compaction, including validation compaction.
 795 compaction_throughput_mb_per_sec: 16
 796
  797 # When compacting, the replacement sstable(s) can be opened before they
 798 # are completely written, and used in place of the prior sstables for
 799 # any range that has been written. This helps to smoothly transfer reads
 800 # between the sstables, reducing page cache churn and keeping hot rows hot
 801 sstable_preemptive_open_interval_in_mb: 50
 802
 803 # Throttles all outbound streaming file transfers on this node to the
 804 # given total throughput in Mbps. This is necessary because Cassandra does
 805 # mostly sequential IO when streaming data during bootstrap or repair, which
 806 # can lead to saturating the network connection and degrading rpc performance.
 807 # When unset, the default is 200 Mbps or 25 MB/s.
 808 # stream_throughput_outbound_megabits_per_sec: 200
 809
 810 # Throttles all streaming file transfer between the datacenters,
 811 # this setting allows users to throttle inter dc stream throughput in addition
 812 # to throttling all network stream traffic as configured with
 813 # stream_throughput_outbound_megabits_per_sec
 814 # When unset, the default is 200 Mbps or 25 MB/s
 815 # inter_dc_stream_throughput_outbound_megabits_per_sec: 200
 816
 817 # How long the coordinator should wait for read operations to complete
 818 read_request_timeout_in_ms: 5000
 819 # How long the coordinator should wait for seq or index scans to complete
 820 range_request_timeout_in_ms: 10000
 821 # How long the coordinator should wait for writes to complete
 822 write_request_timeout_in_ms: 2000
 823 # How long the coordinator should wait for counter writes to complete
 824 counter_write_request_timeout_in_ms: 5000
 825 # How long a coordinator should continue to retry a CAS operation
 826 # that contends with other proposals for the same row
 827 cas_contention_timeout_in_ms: 1000
 828 # How long the coordinator should wait for truncates to complete
 829 # (This can be much longer, because unless auto_snapshot is disabled
 830 # we need to flush first so we can snapshot before removing the data.)
 831 truncate_request_timeout_in_ms: 60000
 832 # The default timeout for other, miscellaneous operations
 833 request_timeout_in_ms: 10000
 834
 835 # Enable operation timeout information exchange between nodes to accurately
 836 # measure request timeouts.  If disabled, replicas will assume that requests
 837 # were forwarded to them instantly by the coordinator, which means that
 838 # under overload conditions we will waste that much extra time processing
 839 # already-timed-out requests.
 840 #
 841 # Warning: before enabling this property make sure to ntp is installed
 842 # and the times are synchronized between the nodes.
 843 cross_node_timeout: false
 844
 845 # Set socket timeout for streaming operation.
 846 # The stream session is failed if no data/ack is received by any of the participants
 847 # within that period, which means this should also be sufficient to stream a large
 848 # sstable or rebuild table indexes.
 849 # Default value is 86400000ms, which means stale streams timeout after 24 hours.
 850 # A value of zero means stream sockets should never time out.
 851 # streaming_socket_timeout_in_ms: 86400000
 852
 853 # phi value that must be reached for a host to be marked down.
 854 # most users should never need to adjust this.
 855 # phi_convict_threshold: 8
 856
 857 # endpoint_snitch -- Set this to a class that implements
 858 # IEndpointSnitch.  The snitch has two functions:
 859 #
 860 # - it teaches Cassandra enough about your network topology to route
 861 #   requests efficiently
 862 # - it allows Cassandra to spread replicas around your cluster to avoid
 863 #   correlated failures. It does this by grouping machines into
 864 #   "datacenters" and "racks."  Cassandra will do its best not to have
  865 #   more than one replica on the same "rack" (which may not actually
 866 #   be a physical location)
 867 #
 868 # CASSANDRA WILL NOT ALLOW YOU TO SWITCH TO AN INCOMPATIBLE SNITCH
 869 # ONCE DATA IS INSERTED INTO THE CLUSTER.  This would cause data loss.
 870 # This means that if you start with the default SimpleSnitch, which
 871 # locates every node on "rack1" in "datacenter1", your only options
 872 # if you need to add another datacenter are GossipingPropertyFileSnitch
 873 # (and the older PFS).  From there, if you want to migrate to an
 874 # incompatible snitch like Ec2Snitch you can do it by adding new nodes
 875 # under Ec2Snitch (which will locate them in a new "datacenter") and
 876 # decommissioning the old ones.
 877 #
 878 # Out of the box, Cassandra provides:
 879 #
 880 # SimpleSnitch:
 881 #    Treats Strategy order as proximity. This can improve cache
 882 #    locality when disabling read repair.  Only appropriate for
 883 #    single-datacenter deployments.
 884 #
 885 # GossipingPropertyFileSnitch
 886 #    This should be your go-to snitch for production use.  The rack
 887 #    and datacenter for the local node are defined in
 888 #    cassandra-rackdc.properties and propagated to other nodes via
 889 #    gossip.  If cassandra-topology.properties exists, it is used as a
 890 #    fallback, allowing migration from the PropertyFileSnitch.
 891 #
 892 # PropertyFileSnitch:
 893 #    Proximity is determined by rack and data center, which are
 894 #    explicitly configured in cassandra-topology.properties.
 895 #
 896 # Ec2Snitch:
 897 #    Appropriate for EC2 deployments in a single Region. Loads Region
 898 #    and Availability Zone information from the EC2 API. The Region is
 899 #    treated as the datacenter, and the Availability Zone as the rack.
 900 #    Only private IPs are used, so this will not work across multiple
 901 #    Regions.
 902 #
 903 # Ec2MultiRegionSnitch:
 904 #    Uses public IPs as broadcast_address to allow cross-region
 905 #    connectivity.  (Thus, you should set seed addresses to the public
 906 #    IP as well.) You will need to open the storage_port or
 907 #    ssl_storage_port on the public IP firewall.  (For intra-Region
 908 #    traffic, Cassandra will switch to the private IP after
 909 #    establishing a connection.)
 910 #
 911 # RackInferringSnitch:
 912 #    Proximity is determined by rack and data center, which are
 913 #    assumed to correspond to the 3rd and 2nd octet of each node's IP
 914 #    address, respectively.  Unless this happens to match your
 915 #    deployment conventions, this is best used as an example of
 916 #    writing a custom Snitch class and is provided in that spirit.
 917 #
 918 # You can use a custom Snitch by setting this to the full class name
 919 # of the snitch, which will be assumed to be on your classpath.
 920
 921 endpoint_snitch: GossipingPropertyFileSnitch
 922
 923 # controls how often to perform the more expensive part of host score
 924 # calculation
 925 dynamic_snitch_update_interval_in_ms: 100
 926 # controls how often to reset all host scores, allowing a bad host to
 927 # possibly recover
 928 dynamic_snitch_reset_interval_in_ms: 600000
 929 # if set greater than zero and read_repair_chance is < 1.0, this will allow
 930 # 'pinning' of replicas to hosts in order to increase cache capacity.
 931 # The badness threshold will control how much worse the pinned host has to be
 932 # before the dynamic snitch will prefer other replicas over it.  This is
  933 # expressed as a double which represents a percentage.  Thus, a value of
 934 # 0.2 means Cassandra would continue to prefer the static snitch values
 935 # until the pinned host was 20% worse than the fastest.
 936 dynamic_snitch_badness_threshold: 0.1
 937
 938 # request_scheduler -- Set this to a class that implements
 939 # RequestScheduler, which will schedule incoming client requests
 940 # according to the specific policy. This is useful for multi-tenancy
 941 # with a single Cassandra cluster.
 942 # NOTE: This is specifically for requests from the client and does
 943 # not affect inter node communication.
 944 # org.apache.cassandra.scheduler.NoScheduler - No scheduling takes place
 945 # org.apache.cassandra.scheduler.RoundRobinScheduler - Round robin of
 946 # client requests to a node with a separate queue for each
 947 # request_scheduler_id. The scheduler is further customized by
 948 # request_scheduler_options as described below.
 949 request_scheduler: org.apache.cassandra.scheduler.NoScheduler
 950
 951 # Scheduler Options vary based on the type of scheduler
 952 #
 953 # NoScheduler
 954 #   Has no options
 955 #
 956 # RoundRobin
 957 #   throttle_limit
 958 #     The throttle_limit is the number of in-flight
 959 #     requests per client.  Requests beyond
 960 #     that limit are queued up until
 961 #     running requests can complete.
 962 #     The value of 80 here is twice the number of
 963 #     concurrent_reads + concurrent_writes.
 964 #   default_weight
 965 #     default_weight is optional and allows for
 966 #     overriding the default which is 1.
 967 #   weights
 968 #     Weights are optional and will default to 1 or the
 969 #     overridden default_weight. The weight translates into how
 970 #     many requests are handled during each turn of the
 971 #     RoundRobin, based on the scheduler id.
 972 #
 973 # request_scheduler_options:
 974 #    throttle_limit: 80
 975 #    default_weight: 5
 976 #    weights:
 977 #      Keyspace1: 1
 978 #      Keyspace2: 5
 979
 980 # request_scheduler_id -- An identifier based on which to perform
 981 # the request scheduling. Currently the only valid option is keyspace.
 982 # request_scheduler_id: keyspace
 983
 984 # Enable or disable inter-node encryption
 985 # JVM defaults for supported SSL socket protocols and cipher suites can
 986 # be replaced using custom encryption options. This is not recommended
 987 # unless you have policies in place that dictate certain settings, or
 988 # need to disable vulnerable ciphers or protocols in case the JVM cannot
 989 # be updated.
 990 # FIPS compliant settings can be configured at JVM level and should not
 991 # involve changing encryption settings here:
 992 # https://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/FIPS.html
 993 # *NOTE* No custom encryption options are enabled at the moment
 994 # The available internode options are : all, none, dc, rack
 995 #
 996 # If set to dc cassandra will encrypt the traffic between the DCs
 997 # If set to rack cassandra will encrypt the traffic between the racks
 998 #
 999 # The passwords used in these options must match the passwords used when generating
1000 # the keystore and truststore.  For instructions on generating these files, see:
1001 # http://download.oracle.com/javase/6/docs/technotes/guides/security/jsse/JSSERefGuide.html#CreateKeystore
1002 #
1003 server_encryption_options:
1004     internode_encryption: none
1005     keystore: conf/.keystore
1006     keystore_password: cassandra
1007     truststore: conf/.truststore
1008     truststore_password: cassandra
1009     # More advanced defaults below:
1010     # protocol: TLS
1011     # algorithm: SunX509
1012     # store_type: JKS
1013     # cipher_suites: [TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_256_CBC_SHA,TLS_DHE_RSA_WITH_AES_128_CBC_SHA,TLS_DHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA]
1014     # require_client_auth: false
1015     # require_endpoint_verification: false
1016
1017 # enable or disable client/server encryption.
1018 client_encryption_options:
1019     enabled: false
1020     # If enabled and optional is set to true encrypted and unencrypted connections are handled.
1021     optional: false
1022     keystore: conf/.keystore
1023     keystore_password: cassandra
1024     # require_client_auth: false
1025     # Set trustore and truststore_password if require_client_auth is true
1026     # truststore: conf/.truststore
1027     # truststore_password: cassandra
1028     # More advanced defaults below:
1029     # protocol: TLS
1030     # algorithm: SunX509
1031     # store_type: JKS
1032     # cipher_suites: [TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_256_CBC_SHA,TLS_DHE_RSA_WITH_AES_128_CBC_SHA,TLS_DHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA]
1033
1034 # internode_compression controls whether traffic between nodes is
1035 # compressed.
1036 # Can be:
1037 #
1038 # all
1039 #   all traffic is compressed
1040 #
1041 # dc
1042 #   traffic between different datacenters is compressed
1043 #
1044 # none
1045 #   nothing is compressed.
1046 internode_compression: dc
1047
1048 # Enable or disable tcp_nodelay for inter-dc communication.
1049 # Disabling it will result in larger (but fewer) network packets being sent,
1050 # reducing overhead from the TCP protocol itself, at the cost of increasing
1051 # latency if you block for cross-datacenter responses.
1052 inter_dc_tcp_nodelay: false
1053
1054 # TTL for different trace types used during logging of the repair process.
1055 tracetype_query_ttl: 86400
1056 tracetype_repair_ttl: 604800
1057
1058 # By default, Cassandra logs GC Pauses greater than 200 ms at INFO level
1059 # This threshold can be adjusted to minimize logging if necessary
1060 # gc_log_threshold_in_ms: 200
1061
1062 # If unset, all GC Pauses greater than gc_log_threshold_in_ms will log at
1063 # INFO level
1064 # UDFs (user defined functions) are disabled by default.
1065 # As of Cassandra 3.0 there is a sandbox in place that should prevent execution of evil code.
1066 enable_user_defined_functions: false
1067
1068 # Enables scripted UDFs (JavaScript UDFs).
1069 # Java UDFs are always enabled, if enable_user_defined_functions is true.
1070 # Enable this option to be able to use UDFs with "language javascript" or any custom JSR-223 provider.
1071 # This option has no effect, if enable_user_defined_functions is false.
1072 enable_scripted_user_defined_functions: false
1073
1074 # The default Windows kernel timer and scheduling resolution is 15.6ms for power conservation.
1075 # Lowering this value on Windows can provide much tighter latency and better throughput, however
1076 # some virtualized environments may see a negative performance impact from changing this setting
1077 # below their system default. The sysinternals 'clockres' tool can confirm your system's default
1078 # setting.
1079 windows_timer_interval: 1
1080
1081
1082 # Enables encrypting data at-rest (on disk). Different key providers can be plugged in, but the default reads from
1083 # a JCE-style keystore. A single keystore can hold multiple keys, but the one referenced by
1084 # the "key_alias" is the only key that will be used for encrypt opertaions; previously used keys
1085 # can still (and should!) be in the keystore and will be used on decrypt operations
1086 # (to handle the case of key rotation).
1087 #
1088 # It is strongly recommended to download and install Java Cryptography Extension (JCE)
1089 # Unlimited Strength Jurisdiction Policy Files for your version of the JDK.
1090 # (current link: http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html)
1091 #
1092 # Currently, only the following file types are supported for transparent data encryption, although
1093 # more are coming in future cassandra releases: commitlog, hints
1094 transparent_data_encryption_options:
1095     enabled: false
1096     chunk_length_kb: 64
1097     cipher: AES/CBC/PKCS5Padding
1098     key_alias: testing:1
1099     # CBC IV length for AES needs to be 16 bytes (which is also the default size)
1100     # iv_length: 16
1101     key_provider:
1102       - class_name: org.apache.cassandra.security.JKSKeyProvider
1103         parameters:
1104           - keystore: conf/.keystore
1105             keystore_password: cassandra
1106             store_type: JCEKS
1107             key_password: cassandra
1108
1109
1110 #####################
1111 # SAFETY THRESHOLDS #
1112 #####################
1113
1114 # When executing a scan, within or across a partition, we need to keep the
1115 # tombstones seen in memory so we can return them to the coordinator, which
1116 # will use them to make sure other replicas also know about the deleted rows.
1117 # With workloads that generate a lot of tombstones, this can cause performance
1118 # problems and even exaust the server heap.
1119 # (http://www.datastax.com/dev/blog/cassandra-anti-patterns-queues-and-queue-like-datasets)
1120 # Adjust the thresholds here if you understand the dangers and want to
1121 # scan more tombstones anyway.  These thresholds may also be adjusted at runtime
1122 # using the StorageService mbean.
1123 tombstone_warn_threshold: 1000
1124 tombstone_failure_threshold: 100000
1125
1126 # Log WARN on any batch size exceeding this value. 5kb per batch by default.
1127 # Caution should be taken on increasing the size of this threshold as it can lead to node instability.
1128 batch_size_warn_threshold_in_kb: 5
1129
1130 # Fail any batch exceeding this value. 50kb (10x warn threshold) by default.
1131 batch_size_fail_threshold_in_kb: 50
1132
1133 # Log WARN on any batches not of type LOGGED than span across more partitions than this limit
1134 unlogged_batch_across_partitions_warn_threshold: 10
1135
1136 # Log a warning when compacting partitions larger than this value
1137 compaction_large_partition_warning_threshold_mb: 100
1138
1139 # GC Pauses greater than gc_warn_threshold_in_ms will be logged at WARN level
1140 # Adjust the threshold based on your application throughput requirement
1141 # By default, Cassandra logs GC Pauses greater than 200 ms at INFO level
1142 gc_warn_threshold_in_ms: 1000
1143
1144 # Maximum size of any value in SSTables. Safety measure to detect SSTable corruption
1145 # early. Any value size larger than this threshold will result into marking an SSTable
1146 # as corrupted.
1147 # max_value_size_in_mb: 256
1148 #
1149 auto_bootstrap: false