memstore_limit_percentage

Description

memstore_limit_percentage specifies the percentage of the total available memory that is used for MemStore.

Attributes

Considerations

• The memstore_limit_percentage parameter is used to calculate the value of memstore_limit. The calculation formula is as follows:

  memstore_limit_percentage = memstore_limit / memory_size

  Here, memory_size is the value specified when the tenant is created, indicating the amount of memory available to the tenant. For more information about memstore_limit, see memory_limit.

• In V4.3.x, you can also configure the percentage of tenant MemStore to the total tenant memory by using the tenant-level hidden parameter _memstore_limit_percentage, starting from V4.3.0. The functionality and default value of _memstore_limit_percentage are the same as those of the cluster-level parameter memstore_limit_percentage. However, the effective scope is different. When configuring these parameters, note the following:

  • If you configure only _memstore_limit_percentage or memstore_limit_percentage (not the default value), the configured value (not the default value) takes precedence.
  • If you configure both the tenant-level hidden parameter _memstore_limit_percentage (not the default value) and the cluster-level parameter memstore_limit_percentage (not the default value), the value of _memstore_limit_percentage takes precedence.
  • If neither parameter is configured or both are configured with the default value, the system adopts the following adaptive strategy:
    • Tenants with 8 GB (real memory) or less are configured with a MemStore ratio of 40%.
    • Tenants with more than 8 GB of memory are configured with a MemStore ratio of 50%.

Examples

Set the percentage of tenant MemStore to 60% of the total available memory.

obclient> ALTER SYSTEM SET memstore_limit_percentage = 60;

References

• Minor freeze and compaction
• Modify the dump configuration
• Tenant memory full
• Memory management within a tenant