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- <?xml version="1.0"?>
- <!-- This is the configuration file for the resource manager in Hadoop. -->
- <!-- You can configure various scheduling parameters related to queues. -->
- <!-- The properties for a queue follow a naming convention,such as, -->
- <!-- mapred.capacity-scheduler.queue.<queue-name>.property-name. -->
- <configuration>
- <property>
- <name>mapred.capacity-scheduler.maximum-system-jobs</name>
- <value>3000</value>
- <description>Maximum number of jobs in the system which can be initialized,
- concurrently, by the CapacityScheduler.
- </description>
- </property>
- <!-- New Config -->
- <property>
- <name>mapred.capacity-scheduler.queue.myqueue1.capacity</name>
- <value>25</value>
- </property>
- <property>
- <name>mapred.capacity-scheduler.queue.myqueue1.maximum-capacity</name>
- <value>50</value>
- </property>
- <property>
- <name>mapred.capacity-scheduler.queue.myqueue2.capacity</name>
- <value>75</value>
- </property>
- <property>
- <name>mapred.capacity-scheduler.queue.myqueue2.maximum-capacity</name>
- <value>80</value>
- </property>
- <!--
- <property>
- <name>mapred.capacity-scheduler.queue.default.capacity</name>
- <value>100</value>
- <description>Percentage of the number of slots in the cluster that are
- to be available for jobs in this queue.
- </description>
- </property>
- <property>
- <name>mapred.capacity-scheduler.queue.default.maximum-capacity</name>
- <value>-1</value>
- <description>
- maximum-capacity defines a limit beyond which a queue cannot use the capacity of the cluster.
- This provides a means to limit how much excess capacity a queue can use. By default, there is no limit.
- The maximum-capacity of a queue can only be greater than or equal to its minimum capacity.
- Default value of -1 implies a queue can use complete capacity of the cluster.
- This property could be to curtail certain jobs which are long running in nature from occupying more than a
- certain percentage of the cluster, which in the absence of pre-emption, could lead to capacity guarantees of
- other queues being affected.
- One important thing to note is that maximum-capacity is a percentage , so based on the cluster's capacity
- the max capacity would change. So if large no of nodes or racks get added to the cluster , max Capacity in
- absolute terms would increase accordingly.
- </description>
- </property>
- <property>
- <name>mapred.capacity-scheduler.queue.default.supports-priority</name>
- <value>false</value>
- <description>If true, priorities of jobs will be taken into
- account in scheduling decisions.
- </description>
- </property>
- <property>
- <name>mapred.capacity-scheduler.queue.default.minimum-user-limit-percent</name>
- <value>100</value>
- <description> Each queue enforces a limit on the percentage of resources
- allocated to a user at any given time, if there is competition for them.
- This user limit can vary between a minimum and maximum value. The former
- depends on the number of users who have submitted jobs, and the latter is
- set to this property value. For example, suppose the value of this
- property is 25. If two users have submitted jobs to a queue, no single
- user can use more than 50% of the queue resources. If a third user submits
- a job, no single user can use more than 33% of the queue resources. With 4
- or more users, no user can use more than 25% of the queue's resources. A
- value of 100 implies no user limits are imposed.
- </description>
- </property>
- <property>
- <name>mapred.capacity-scheduler.queue.default.user-limit-factor</name>
- <value>1</value>
- <description>The multiple of the queue capacity which can be configured to
- allow a single user to acquire more slots.
- </description>
- </property>
- <property>
- <name>mapred.capacity-scheduler.queue.default.maximum-initialized-active-tasks</name>
- <value>200000</value>
- <description>The maximum number of tasks, across all jobs in the queue,
- which can be initialized concurrently. Once the queue's jobs exceed this
- limit they will be queued on disk.
- </description>
- </property>
- <property>
- <name>mapred.capacity-scheduler.queue.default.maximum-initialized-active-tasks-per-user</name>
- <value>100000</value>
- <description>The maximum number of tasks per-user, across all the of the
- user's jobs in the queue, which can be initialized concurrently. Once the
- user's jobs exceed this limit they will be queued on disk.
- </description>
- </property>
- <property>
- <name>mapred.capacity-scheduler.queue.default.init-accept-jobs-factor</name>
- <value>10</value>
- <description>The multipe of (maximum-system-jobs * queue-capacity) used to
- determine the number of jobs which are accepted by the scheduler.
- </description>
- </property>
- -->
- <!-- The default configuration settings for the capacity task scheduler -->
- <!-- The default values would be applied to all the queues which don't have -->
- <!-- the appropriate property for the particular queue -->
- <property>
- <name>mapred.capacity-scheduler.default-supports-priority</name>
- <value>false</value>
- <description>If true, priorities of jobs will be taken into
- account in scheduling decisions by default in a job queue.
- </description>
- </property>
- <property>
- <name>mapred.capacity-scheduler.default-minimum-user-limit-percent</name>
- <value>100</value>
- <description>The percentage of the resources limited to a particular user
- for the job queue at any given point of time by default.
- </description>
- </property>
- <property>
- <name>mapred.capacity-scheduler.default-user-limit-factor</name>
- <value>1</value>
- <description>The default multiple of queue-capacity which is used to
- determine the amount of slots a single user can consume concurrently.
- </description>
- </property>
- <property>
- <name>mapred.capacity-scheduler.default-maximum-active-tasks-per-queue</name>
- <value>200000</value>
- <description>The default maximum number of tasks, across all jobs in the
- queue, which can be initialized concurrently. Once the queue's jobs exceed
- this limit they will be queued on disk.
- </description>
- </property>
- <property>
- <name>mapred.capacity-scheduler.default-maximum-active-tasks-per-user</name>
- <value>100000</value>
- <description>The default maximum number of tasks per-user, across all the of
- the user's jobs in the queue, which can be initialized concurrently. Once
- the user's jobs exceed this limit they will be queued on disk.
- </description>
- </property>
- <property>
- <name>mapred.capacity-scheduler.default-init-accept-jobs-factor</name>
- <value>10</value>
- <description>The default multipe of (maximum-system-jobs * queue-capacity)
- used to determine the number of jobs which are accepted by the scheduler.
- </description>
- </property>
- <!-- Capacity scheduler Job Initialization configuration parameters -->
- <property>
- <name>mapred.capacity-scheduler.init-poll-interval</name>
- <value>5000</value>
- <description>The amount of time in miliseconds which is used to poll
- the job queues for jobs to initialize.
- </description>
- </property>
- <property>
- <name>mapred.capacity-scheduler.init-worker-threads</name>
- <value>5</value>
- <description>Number of worker threads which would be used by
- Initialization poller to initialize jobs in a set of queue.
- If number mentioned in property is equal to number of job queues
- then a single thread would initialize jobs in a queue. If lesser
- then a thread would get a set of queues assigned. If the number
- is greater then number of threads would be equal to number of
- job queues.
- </description>
- </property>
- </configuration>
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