Shashikant Banerjee created RATIS-829:
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Summary: Add an StateMachine API to evict stateMachineData from
cache when both followers catch up
Key: RATIS-829
URL: https://issues.apache.org/jira/browse/RATIS-829
Project: Ratis
Issue Type: Bug
Reporter: Shashikant Banerjee
Assignee: Shashikant Banerjee
Fix For: 0.6.0
Currently, the data in the StateMachineCache is evicted as soon as the
applyTransaction call is issued for a transaction in Ratis in ozone. In our
testing with keys in few kbs of size, it was figured that the data is evicted
from the cache before append requests can be processed in a slightly slow
follower thereby making leader read the chunk data from underlying fs/disk very
frequently. This leads to slowing down the leader as well as well as overall
throughput of the pipeline.
The idea here is to ensure the data is evicted from the cache only when both
followers have caught up with the match index and for that, it will call into
stateMachine if the data is cached in the stateMachine.
This is required for https://issues.apache.org/jira/browse/HDDS-3227.
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