Yan Zhao created ZOOKEEPER-4794:
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Summary: Reduce the ZKDatabase#committedLog memory usage
Key: ZOOKEEPER-4794
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4794
Project: ZooKeeper
Issue Type: Improvement
Components: server
Affects Versions: 3.9.1
Reporter: Yan Zhao
In ZKDatabase, after a quorum request is committed successfully, the ZKDatabase
will wrap the request into a proposal and store it in the committedLog.
The wrap operation: Serialize the request to a byte array and wrap the byte
array in the QuorumPacket, so if the request payload size is 1M, the Proposal
will occupy 2M memory, which will increase the memory pressure.
The committedLog is used for fast follower synchronization, so we can serialize
the request in the synchronization of the processes, no need to serialize the
request in advance.
It can reduce half of the memory for committedLog
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