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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2105) All appends are serialized in HLog
Date Mon, 11 Jan 2010 19:33:54 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12798812#action_12798812

ryan rawson commented on HBASE-2105:

I think the underlying sequence file is synchronized, so I'm not sure how much this would

> All appends are serialized in HLog
> ----------------------------------
>                 Key: HBASE-2105
>                 URL: https://issues.apache.org/jira/browse/HBASE-2105
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.20.2
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>            Priority: Blocker
>             Fix For: 0.20.4, 0.21.0
> duiod on IRC was asking about locks on the write path so I reviewed it a bit and saw
that we are very good at not locking except on row level in HRegion and others but in HLog
we actually synchronize everything on updateLock. I'm pretty sure that's not what we want.
I guess a RWLock would be more useful.

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