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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5930) Periodically flush the Memstore?
Date Sun, 18 Nov 2012 04:52:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13499603#comment-13499603
] 

Lars Hofhansl commented on HBASE-5930:
--------------------------------------

I would like to pick this up again and add a flag to Mutation to indicate deferred WAL sync.
If HRegion receives a batch of Mutation of which at least one is not marked as deferred the
log is sync'ed. Otherwise it is deferred.
This will mingle well later with HBASE-5954.
                
> 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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