Fangmin Lv created ZOOKEEPER-3110:
-------------------------------------
Summary: Improve the closeSession throughput in
PrepRequestProcessor
Key: ZOOKEEPER-3110
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3110
Project: ZooKeeper
Issue Type: Improvement
Components: quorum
Reporter: Fangmin Lv
Assignee: Fangmin Lv
Fix For: 3.6.0
On leader every expired global session will add 3 lines of logs, which is
pretty heavy and if the log file is more than a few GB, the log for the
closeSession in PrepRequestProcessor will slow down the whole ensemble's
throughput.
>From some use case, we found the prep request processor will be a bottleneck
>when there are constantly high number of expired session or closing session
>explicitly.
This patch is going to remove one of the useless log when prepare close session
txns, which
should give us higher throughput during processing large number of expire
sessions.
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