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https://issues.apache.org/jira/browse/TEPHRA-299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16842802#comment-16842802
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Andreas Neumann commented on TEPHRA-299:
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Please go ahead. Looks like [~poornachandra] already reviewed and approved it.
> Executing a large batch delete is very slow
> -------------------------------------------
>
> Key: TEPHRA-299
> URL: https://issues.apache.org/jira/browse/TEPHRA-299
> Project: Tephra
> Issue Type: Bug
> Affects Versions: 0.15.0-incubating
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Priority: Major
> Attachments: 299-DOES-NOT_WORK.txt, 299-client-v2.txt,
> 299-client-v3.txt, 299-client.txt
>
>
> I noticed that batch deletes are quire slow. In the profiler I found that
> almost all of the time is spent in
> org.apache.hadoop.hbase.regionserver.wal.FSHLog.blockOnSync().
> Looking at TransactionProcessor.preDelete it is obvious why:
> The batch delete is translated into *single* puts that are added to the
> region one by one, so each time the WAL is flushed.
>
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