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From "Appy (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15959) Fix flaky test TestRegionServerMetrics.testMobMetrics
Date Fri, 03 Jun 2016 22:23:59 GMT
Appy created HBASE-15959:
----------------------------

             Summary: Fix flaky test TestRegionServerMetrics.testMobMetrics
                 Key: HBASE-15959
                 URL: https://issues.apache.org/jira/browse/HBASE-15959
             Project: HBase
          Issue Type: Bug
            Reporter: Appy


It flakes [here|https://github.com/apache/hbase/blob/b557f0bec62a48753e5d01d7a47f3c9e5a6b3ee8/hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionServerMetrics.java#L460].
There are two weird things i identified:
1. In second compaction, [scanner|https://github.com/apache/hbase/blob/b557f0bec62a48753e5d01d7a47f3c9e5a6b3ee8/hbase-server/src/main/java/org/apache/hadoop/hbase/mob/DefaultMobStoreCompactor.java#L173]
has 10 storefiles. Shouldn't there be 6? 5 from recent flushes and 1 from earlier compaction.
Probably because mob cleaner doesn't clean old hfiles. Does this needs fixing?
2. Across runs, same cell (ie. same key) may or may not be considered mob reference cell.
[here|https://github.com/apache/hbase/blob/b557f0bec62a48753e5d01d7a47f3c9e5a6b3ee8/hbase-server/src/main/java/org/apache/hadoop/hbase/mob/DefaultMobStoreCompactor.java#L213].
This at least happens with row keys 0 - 4 (which got compacted earlier). [~jmhsieh] Any ideas
why this would happen.



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