[jira] [Commented] (HBASE-15959) Fix flaky test TestRegionServerMetrics.testMobMetrics

["Jonathan Hsieh (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-15959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15315047#comment-15315047 ] 

Jonathan Hsieh commented on HBASE-15959:
----------------------------------------

I will try to take a look at this in the next week or so.

> 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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