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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15837) More gracefully handle a negative memstoreSize
Date Tue, 17 May 2016 18:43:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15287248#comment-15287248
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Josh Elser commented on HBASE-15837:
------------------------------------

bq. I was also looking at this to understand what may have happened. The memstore size discrepancy
happens when the index update fails for Phoenix. I also have a patch that should fix the root
cause. 

Great findings! Your patch makes sense to me.

> More gracefully handle a negative memstoreSize
> ----------------------------------------------
>
>                 Key: HBASE-15837
>                 URL: https://issues.apache.org/jira/browse/HBASE-15837
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>             Fix For: 2.0.0
>
>         Attachments: HBASE-15837.001.patch, hbase-memstore-size-accounting.patch
>
>
> Over in PHOENIX-2883, I've been trying to figure out how to track down the root cause
of an issue we were seeing where a negative memstoreSize was ultimately causing an RS to abort.
The tl;dr version is
> * Something causes memstoreSize to be negative (not sure what is doing this yet)
> * All subsequent flushes short-circuit and don't run because they think there is no data
to flush
> * The region is eventually closed (commonly, for a move).
> * A final flush is attempted on each store before closing (which also short-circuit for
the same reason), leaving unflushed data in each store.
> * The sanity check that each store's size is zero fails and the RS aborts.
> I have a little patch which I think should improve our failure case around this, preventing
the RS abort safely (forcing a flush when memstoreSize is negative) and logging a calltrace
when an update to memstoreSize make it negative (to find culprits in the future).



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