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https://issues.apache.org/jira/browse/HBASE-24545?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Stack resolved HBASE-24545.
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Fix Version/s: 2.3.0
3.0.0-alpha-1
Hadoop Flags: Reviewed
Assignee: Michael Stack
Resolution: Fixed
Merged to branch-2.3+. Thanks for reviews [~zhangduo]
> Add backoff to SCP check on WAL split completion
> ------------------------------------------------
>
> Key: HBASE-24545
> URL: https://issues.apache.org/jira/browse/HBASE-24545
> Project: HBase
> Issue Type: Bug
> Reporter: Michael Stack
> Assignee: Michael Stack
> Priority: Major
> Fix For: 3.0.0-alpha-1, 2.3.0
>
>
> Crashed cluster. Lots of backed up WALs. Startup. Recover hundreds of
> servers; each has a running SCP. Taking a thread dump during recovery, I
> noticed that there were 160 threads each in SCP waiting on split WAL
> completion. Each thread was scanning zk splitWAL directory every 100ms. The
> dir had thousands of entries in it so each check was pulling down MB from
> zk... * 160 (max configured PE threads (16) * 10 for the KeepAlive factor
> that has us do 10 * configured PEs as max for PE worker pool).
> If lots of remaining WALs to split, have the SCP backoff on its wait so it
> checks less frequently.
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