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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5930) Periodically flush the Memstore?
Date Thu, 25 Apr 2013 04:02:16 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5930?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-5930:
---------------------------------

    Attachment: 5930-track-oldest-sample.txt

Here's a sample patch of what I mean.
                
> Periodically flush 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: 0.95.1
>
>         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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