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https://issues.apache.org/jira/browse/HBASE-26874?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Duo Zhang resolved HBASE-26874.
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Resolution: Fixed
> VerifyReplication recompare async
> ---------------------------------
>
> Key: HBASE-26874
> URL: https://issues.apache.org/jira/browse/HBASE-26874
> Project: HBase
> Issue Type: Improvement
> Reporter: Bryan Beaudreault
> Assignee: Hernan Gelaf-Romer
> Priority: Major
> Fix For: 3.0.0-beta-1, 2.6.0
>
>
> VerifyReplication includes an option "sleepMsBeforeReCompare". This is useful
> for helping work around replication lag. However, adding a sleep in a hadoop
> job can drastically slow that job down if there is anything more than a small
> number of invalid results.
> We can mitigate this by doing the recompare in a separate thread. We can
> limit the thread pool and fallback to doing the recompare in the main thread
> if the thread pool is full. This way we offload some of the slowness but
> still retain the same validation guarantees. A configuration can be added to
> control how many threads per mapper.
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