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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5930) Periodically flush the Memstore?
Date Thu, 03 May 2012 19:56:49 GMT
Lars Hofhansl created HBASE-5930:
------------------------------------

             Summary: 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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