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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5930) Periodically flush the Memstore?
Date Thu, 24 Jan 2013 07:15:14 GMT

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

Devaraj Das updated HBASE-5930:
-------------------------------

    Attachment: 5930-1.patch

Simplified the logic that checks whether to do flush or not (HRegion.shouldFlush()).
                
> 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: 0.96.0
>
>         Attachments: 5930-1.patch, 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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