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From "Sahil Aggarwal (JIRA)" <j...@apache.org>
Subject [jira] [Work stopped] (HBASE-17104) Improve cryptic error message "Memstore size is" on region close
Date Wed, 02 Aug 2017 03:44:00 GMT

     [ https://issues.apache.org/jira/browse/HBASE-17104?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on HBASE-17104 stopped by Sahil Aggarwal.
----------------------------------------------
> Improve cryptic error message "Memstore size is" on region close
> ----------------------------------------------------------------
>
>                 Key: HBASE-17104
>                 URL: https://issues.apache.org/jira/browse/HBASE-17104
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: Matteo Bertozzi
>            Assignee: Sahil Aggarwal
>            Priority: Trivial
>              Labels: beginner, noob
>             Fix For: 2.0.0
>
>         Attachments: HBASE-17104.master.001 (1).patch, HBASE-17104.master.001.patch
>
>
> while grepping my RS log for ERROR I found a cryptic
> {noformat}
> ERROR [RS_CLOSE_REGION-u1604vm:35021-1] regionserver.HRegion(1601): Memstore size is
33744
> {noformat}
> from the code looks like we seems to want to notify the user about the fact that on close
the rs was not able to flush and there were things in the RS. 
> https://github.com/apache/hbase/blob/c3685760f004450667920144f926383eb307de53/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java#L1601
> {code}
> if (!canFlush) {
>   this.decrMemstoreSize(new MemstoreSize(memstoreDataSize.get(), getMemstoreHeapOverhead()));
> } else if (memstoreDataSize.get() != 0) {
>   LOG.error("Memstore size is " + memstoreDataSize.get());
> }
> {code}
> this should probably not even be an error but a warn or even info, unless we have puts
that specifically asked to not be written to the wal,  otherwise the data in the memstore
should be safe in the wals. 
> In any case it will be nice to have a message describing what is going on and why we
are notifying about the memstore size.



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