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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17658) Bookkeeping issue in BaseLoadBalancer for Table Skew
Date Fri, 17 Feb 2017 15:38:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15871993#comment-15871993
] 

Ted Yu commented on HBASE-17658:
--------------------------------

{code}
testMobGetAtomicity[1](org.apache.hadoop.hbase.TestAcidGuarantees)  Time elapsed: 21.968 sec
 <<< ERROR!
java.lang.RuntimeException: Deferred
	at org.apache.hadoop.hbase.MultithreadedTestUtil$TestContext.checkException(MultithreadedTestUtil.java:79)
	at org.apache.hadoop.hbase.MultithreadedTestUtil$TestContext.waitFor(MultithreadedTestUtil.java:72)
	at org.apache.hadoop.hbase.TestAcidGuarantees.runTestAtomicity(TestAcidGuarantees.java:388)
	at org.apache.hadoop.hbase.TestAcidGuarantees.testMobGetAtomicity(TestAcidGuarantees.java:435)
{code}
Not related to patch.

> Bookkeeping issue in BaseLoadBalancer for Table Skew
> ----------------------------------------------------
>
>                 Key: HBASE-17658
>                 URL: https://issues.apache.org/jira/browse/HBASE-17658
>             Project: HBase
>          Issue Type: Bug
>          Components: Balancer
>            Reporter: Tim Brown
>            Assignee: Tim Brown
>         Attachments: JIRA-17658.master.001.patch
>
>
> Currently when numMaxRegionsPerTable of a given table increases above the current maximum,
the value is not properly updated. This means that the cost for Table Skew cannot get worse
for a given region move during the balancer process leading to an imbalanced cluster with
respect to Table Skew.



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