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From "Matt Corgan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5930) Periodically flush the Memstore?
Date Thu, 03 May 2012 21:26:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267812#comment-13267812
] 

Matt Corgan commented on HBASE-5930:
------------------------------------

Maybe add a boolean to the memstore to track if it contains edits that were not written to
the WAL.  No need to auto-flush in the frequent case where all edits are in the WAL.
                
> Periodically flush the Memstore?
> --------------------------------
>
>                 Key: HBASE-5930
>                 URL: https://issues.apache.org/jira/browse/HBASE-5930
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Lars Hofhansl
>            Priority: Minor
>
> 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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