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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3530) Do not start LogSyncer when not in deferred flush mode
Date Mon, 14 Feb 2011 18:09:57 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12994399#comment-12994399
] 

Jonathan Gray commented on HBASE-3530:
--------------------------------------

In some of the HLog improvements that Dhruba and I have been working on, we've become dependent
on the LogSyncer thread.  However, this is also still using an HBase-side group commit.  Just
an FYI (alternative implementations of HLog might be a neat idea, there are lots of different
ways to optimize depending on the use case)... don't let it hold you up.

Expect some patches this week around this stuff.  Currently tracking down a pesky race condition.

> Do not start LogSyncer when not in deferred flush mode
> ------------------------------------------------------
>
>                 Key: HBASE-3530
>                 URL: https://issues.apache.org/jira/browse/HBASE-3530
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 0.90.0
>            Reporter: Lars George
>            Priority: Minor
>             Fix For: 0.92.0
>
>
> Currently we always start the LogSyncer thread, even when not necessary because the "deferred
flush" is set to false and the sync() is called on every record. We could disable the thread
and not have it flush every n secs unnecessarily.

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