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https://issues.apache.org/jira/browse/HBASE-5930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269116#comment-13269116
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stack commented on HBASE-5930:
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I like idea of client saying whether to put it on deferred flush queue or 
whether its to be flushed immediately.
                
> 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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