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hologres_worker_compute_nodes

  • Workers are the compute nodes in Hologres that process queries and manage hologres_storage_engines
  • Each worker handles multiple hologres_shard
  • Each worker creates multiple internal storage engines and each storage engine reads data from and writes data to a shard
NOTE

If you do not specify the number of table groups and shard count when you create a database, Hologres creates a default table group for you and sets the default shard count for the table group

For more information, see Instance types

Resource Allocation​

  • Hologres Shards are distributed evenly across workers to ensure balanced resource usage
  • Prevents uneven resource allocation where a table group is allocated to one worker and other workers are idle
WARNING

If the shard count is not proportional to the number of workers, some workers may become idle

Failover Handling​

  • If a worker fails, its shards are reallocated to healthy workers to maintain even distribution
  • The query engine can access data on shards by calling these operations to implement high-performance data writes or reads

References