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https://issues.apache.org/jira/browse/HBASE-6647?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jean-Daniel Cryans updated HBASE-6647:
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Attachment: HBASE-6647-0.94-v2.patch
Patch with comments.
I started reading more about what's going on since HBASE-4528 and I was this
close to doing a massive refactoring. Just look at HLog.doWrite and tell me
it's doing something that's actually a write operation. It's not anymore. I'm
also wondering what we should do with the coprocs. I'll leave that for another
jira.
> [performance regression] appendNoSync/HBASE-4528 doesn't take deferred log
> flush into account
> ---------------------------------------------------------------------------------------------
>
> Key: HBASE-6647
> URL: https://issues.apache.org/jira/browse/HBASE-6647
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.94.0
> Reporter: Jean-Daniel Cryans
> Fix For: 0.96.0, 0.94.2
>
> Attachments: HBASE-6647-0.94.patch, HBASE-6647-0.94-v2.patch
>
>
> Since we upgraded to 0.94.1 from 0.92 I saw that our ICVs are about twice as
> slow as they were. jstack'ing I saw that most of the time we are waiting on
> sync()... but those tables have deferred log flush turned on so they
> shouldn't even be calling it.
> HTD.isDeferredLogFlush is currently only called in the append() methods which
> are pretty much not in use anymore.
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