connected to unix/:/var/run/tarantool/tarantool.sock
unix/:/var/run/tarantool/tarantool.sock> _TARANTOOL
---
- 1.7.7-227-g33980fc59
...

unix/:/var/run/tarantool/tarantool.sock> box.cfg
---
- log_nonblock: true
  vinyl_run_count_per_level: 2
  rows_per_wal: 500000
  vinyl_range_size: 1073741824
  readahead: 16320
  log_level: 5
  checkpoint_interval: 3600
  vinyl_page_size: 8192
  coredump: false
  vinyl_run_size_ratio: 3.5
  replication_timeout: 1
  wal_max_size: 268435456
  slab_alloc_factor: 1.05
  background: false
  vinyl_dir: /var/lib/tarantool
  vinyl_cache: 134217728
  vinyl_read_threads: 1
  vinyl_timeout: 60
  memtx_min_tuple_size: 16
  listen: '3301'
  too_long_threshold: 0.5
  vinyl_max_tuple_size: 1048576
  vinyl_write_threads: 2
  vinyl_bloom_fpr: 0.05
  log_format: plain
  memtx_max_tuple_size: 1048576
  memtx_dir: /var/lib/tarantool
  hot_standby: false
  vinyl_memory: 134217728
  wal_mode: none
  worker_pool_threads: 4
  wal_dir: /var/lib/tarantool
  read_only: false
  pid_file: /var/run/tarantool/tarantool.pid
  memtx_memory: 268435456
  force_recovery: false
  replication_sync_lag: 10
  checkpoint_count: 2
  wal_dir_rescan_delay: 2
...

unix/:/var/run/tarantool/tarantool.sock> box.space._space.index.name:select{'MySpace'}
---
- - [528, 1, 'MySpace', 'memtx', 0, {}, [{
    'index': 1,      'type': 'unsigned',   'isIndexable': true, 'name': 'id',      }, {
    'index': 2,      'type': 'integer',    'is_nullable': true, 'name': 'deletedAt'}, {
    'index': 3,      'type': 'integer',    'is_nullable': true, 'name': 'createdAt'}, {
    'index': 4,      'type': 'unsigned',   'isIndexable': true, 'name': 'field1', 'defaultValue': 0}, {
    'index': 5,      'type': 'unsigned',   'isIndexable': true, 'name': 'field2', 'defaultValue': 0}, {
    'index': 6,      'type': 'integer',    'is_nullable': true, 'name': 'updatedAt'}, {
    'index': 7,      'type': 'number',     'is_nullable': true, 'name': 'field3', 'defaultValue': 0}, {
    'index': 8,      'type': 'unsigned',   'isIndexable': true, 'name': 'field4', 'defaultValue': 0}, {
    'name': 'field5', 'is_nullable': true}, {
    'name': 'field6', 'is_nullable': true}, {
    'name': 'field7', 'is_nullable': true}]
]

unix/:/var/run/tarantool/tarantool.sock> box.space.MySpace.index
---
- 0: &0
    unique: true
    parts:
    - type: unsigned
      is_nullable: false
      fieldno: 1
    sequence_id: 16
    id: 0
    space_id: 528
    name: id
    type: TREE
  1: &1
    unique: true
    parts:
    - type: unsigned
      is_nullable: false
      fieldno: 5
    - type: unsigned
      is_nullable: false
      fieldno: 8
    id: 1
    space_id: 528
    name: secondaryIndex
    type: TREE
  2: &2
    unique: false
    parts:
    - type: unsigned
      is_nullable: false
      fieldno: 8
    id: 2
    space_id: 528
    name: field4index
    type: TREE
  3: &3
    unique: false
    parts:
    - type: unsigned
      is_nullable: false
      fieldno: 4
    id: 3
    space_id: 528
    name: field1index
    type: TREE
  secondaryIndex: *1
  id: *0
  field1index: *3
  field4index: *2
...

--LUA FUNCTION
function createOrUpdate(space_name, value)
    local one = box.space.MySpace.index.secondaryIndex:get{value.field2, value.field4}
    if one then
        box.space.MySpace:update(one[1], {{'=', 7, value.field3}})
    else
        box.space.MySpace:auto_increment{0, 0, value.field1, value.field2, 0, value.field3, value.field4} --This code was executed only once long long ago in a galaxy far far away
    end
    return value
end


//JAVA CODE

//Connector.java
    private static TarantoolClient client;

    public Connector(String host, int port, String username, String password) throws IOException {
        //Initializing config
        client = new TarantoolClientImpl(socketChannelProvider, config);
    }

    public<T> void createOrUpdate(T t, Class<T> tClass) {
        try {
            client.asyncOps().call("createOrUpdate", getSpaceName(tClass.getSimpleName()), objectMapper.convertValue(t, Map.class)).get();
        } catch (...) { ... }
    }

//MySpace.java
public class MySpace {
    public int field1;
    public int field2;
    public double field3;
    public int field4;

    //Constructors, toString and so on
}

//In psvm
    List<MySpace> objects = get();
    System.out.println(objects.size());    //1_194_285
    objects.parallelStream().forEach(object -> connector.createOrUpdate(object, MySpace.class));


$ docker ps
CONTAINER ID        IMAGE                       COMMAND                  CREATED             STATUS                PORTS                      NAMES
645ebd1bc754        progaudi/tarantool:1.7.7    "docker-entrypoint..."   3 weeks ago         Up 2 days (healthy)   0.0.0.0:3303->3301/tcp     tarantool

//crontab
0 * * * * java -jar java.jar localhost 3303 username password "<params>" >> /root/log.txt