It calculates the expected node configuration, i. e., the list of keepers and sentinels expected to run and their configurations, from the shardman/cluster0/data/ladle and shardman/cluster0/data/cluster values.

It receives the list of running keepers and sentinels with their configurations from the internal process manager.

It stops processes that are not expected to run. This can be a process that belongs to a cluster with the same name, but a different UUID, or a process whose description is no longer present in the expected node configuration. For keeper processes, shardmand purges their data directory.

If a process should be running, but its settings are different from the expected ones, shardmand updates the configuration and restarts the process. If a process should be running, but it is not running, shardmand starts it.

/shardmand/v1/replica — returns 200 status code if a secondary instance is running on node, 500 status code if a primary instance is running on node, /shardmand/v1/master — returns 200 status code if a primary instance is running on node, 500 status code if a secondary instance is running on node, /shardmand/v1/referee — returns 200 status code if the only instance running on node is referee, 500 status code if the only instance running on node is primary or secondary, 404 if more than one instance is running. If node both primary and secondary instances are running on node /shardmand/v1/replica and shardmand/v1/master endpoints return 404 status code.

/shardmand/v1/status — getting information about shardmand status, including boot_uuid.

/shardmand/v1/tables — returns a list of information about sharded and global tables in the following format:

[
  {
    "table": "schema.table",
    "type": "sharded",
    "distributed_by": [
      {
        "number": 1,
        "field": "key",
        "type": "integer"
      }
    ],
    "colocate_with": "schema.table",
    "partitions": [
      {
        "shard": "shard-1",
        "code": 0
      }
    ],
    "fields": [
      {
        "name": "key",
        "type": "integer",
        "nullable": false
      }
    ]
   }
]