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Date: Thu, 25 Apr 2013 20:08:16 +0000 (UTC)
From: "Lars Hofhansl (JIRA)" <jira@apache.org>
To: dev@hbase.apache.org
Message-ID: <JIRA.12553819.1336074918418.226042.1366920496479@arcas>
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Subject: [jira] [Reopened] (HBASE-5930) Limits the amount of time an edit
 can live in the memstore.
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     [ https://issues.apache.org/jira/browse/HBASE-5930?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl reopened HBASE-5930:
----------------------------------


Let me keep that open until I have the 0.94 patch.
                
> Limits the amount of time an edit can live in the memstore.
> -----------------------------------------------------------
>
>                 Key: HBASE-5930
>                 URL: https://issues.apache.org/jira/browse/HBASE-5930
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Lars Hofhansl
>            Assignee: Devaraj Das
>            Priority: Minor
>             Fix For: 0.98.0, 0.95.1
>
>         Attachments: 5930-1.patch, 5930-2.1.patch, 5930-2.2.patch, 5930-2.3.patch, 5930-2.4.patch, 5930-track-oldest-sample.txt, 5930-wip.patch
>
>
> A colleague of mine ran into an interesting issue.
> He inserted some data with the WAL disabled, which happened to fit in the aggregate Memstores memory.
> Two weeks later he a had problem with the HDFS cluster, which caused the region servers to abort. He found that his data was lost. Looking at the log we found that the Memstores were not flushed at all during these two weeks.
> Should we have an option to flush memstores periodically. There are obvious downsides to this, like many small storefiles, etc.

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