setOLAPCacheEngineSize

setOLAPCacheEngineSize(memSize)

Alias: setCacheEngineMemSize

memSize is a numeric scalar (in GB). It must be greater than 0 and less than maxMemSize * 0.75.

Modify the capacity of the OLAP cache engine online. In a cluster, this command can only be executed by the admin on a data node or compute node. Please make sure the cache engine is enabled by specifying configuration parameter chunkCacheEngineMemSize before execution.

• Scenario: If the cache engine is enabled, the system will first write the data to the cache. Only when the amount of cached data reaches 30% of chunkCacheEngineMemSize will it be written to disk. If the configuration parameter is set too low, massive concurrent writes may take up the cache engine capacity quickly and cause the writing process stuck. In this case, execute the command to online modify the cache engine capacity to ensure that the writes continue.

• You can obtain the real-time status of the cache engine with function getOLAPCacheEngineSize to check if the modification takes effect online.

Related function: getOLAPCacheEngineSize