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From "Billy Pearson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-69) [hbase] Make cache flush triggering less simplistic
Date Tue, 05 Feb 2008 01:55:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-69?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565624#action_12565624
] 

Billy Pearson commented on HBASE-69:
------------------------------------

example of hlog above

Region server log
{code}
2008-02-04 19:36:50,813 FATAL org.apache.hadoop.hbase.HRegionServer: unable to report to master
for 34439 milliseconds - aborting server
{code}

Master Server Log
{code}
2008-02-04 19:47:45,456 DEBUG org.apache.hadoop.hbase.HLog: Applied 15820000 edits
{code}

The file for the region
oldlogfile.log = 3.46GB

> [hbase] Make cache flush triggering less simplistic
> ---------------------------------------------------
>
>                 Key: HBASE-69
>                 URL: https://issues.apache.org/jira/browse/HBASE-69
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: stack
>            Assignee: Jim Kellerman
>         Attachments: patch.txt, patch.txt, patch.txt, patch.txt, patch.txt, patch.txt,
patch.txt, patch.txt, patch.txt
>
>
> When flusher runs -- its triggered when the sum of all Stores in a Region > a configurable
max size -- we flush all Stores though a Store memcache might have but a few bytes.
> I would think Stores should only dump their memcache disk if they have some substance.
> The problem becomes more acute, the more families you have in a Region.
> Possible behaviors would be to dump the biggest Store only, or only those Stores >
50% of max memcache size.  Behavior would vary dependent on the prompt that provoked the flush.
 Would also log why the flush is running: optional or > max size.
> This issue comes out of HADOOP-2621.

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