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hologres_shard

  • A shard is a physical storage unit in Hologres, where data is stored and processed.
  • Shards are managed by pangu

Relationship diagram

Shard Allocation​

  • When a table is created, it is assigned to a table group, and data is distributed to specific shards.
  • Each shard has a unique ID within an instance.

Shard Count and Workers​

  • Shards are distributed across worker compute nodes for parallel processing.
  • The number of shards should be proportional to the number of workers to ensure balanced resource allocation.

Failover Handling​

  • If a worker fails, its shards are reallocated to healthy workers to maintain even distribution.

References