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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-6647) [performance regression] appendNoSync/HBASE-4528 doesn't take deferred log flush into account
Date Mon, 27 Aug 2012 20:37:08 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6647?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jean-Daniel Cryans updated HBASE-6647:
--------------------------------------

    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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