[jira] [Created] (HBASE-15837) More gracefully handle a negative memstoreSize

["Josh Elser (JIRA)" <ji...@apache.org>]

Josh Elser created HBASE-15837:
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             Summary: 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


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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