Appy created HBASE-15959:
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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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