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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15102) HeapMemoryTuner can "overtune" memstore size and suddenly drop it into blocking zone
Date Wed, 20 Jan 2016 01:22:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15107790#comment-15107790
] 

Hudson commented on HBASE-15102:
--------------------------------

FAILURE: Integrated in HBase-1.3 #501 (See [https://builds.apache.org/job/HBase-1.3/501/])
HBASE-15102 Fix HeapMemoryTuner overtuning memstore (eclark: rev a61f3ecc8b3dad256b7ec5258e1ec4aa811cb606)
* hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHeapMemoryManager.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/DefaultHeapMemoryTuner.java


> HeapMemoryTuner can "overtune" memstore size and suddenly drop it into blocking zone
> ------------------------------------------------------------------------------------
>
>                 Key: HBASE-15102
>                 URL: https://issues.apache.org/jira/browse/HBASE-15102
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 2.0.0, 1.2.0, 1.3.0
>            Reporter: Ashu Pachauri
>            Assignee: Ashu Pachauri
>            Priority: Critical
>             Fix For: 2.0.0, 1.2.0, 1.3.0
>
>         Attachments: HBASE-15102-V0.patch, HBASE-15102-V1.patch, HBASE-15102-V2.patch,
HBASE-15102-V3.patch
>
>
> DefaultHeapMemoryTuner often resets the maximum step size for tuning to 8% of total heap
size. Often, when the size of memstore is to be decreased while tuning, the 8% tuning can
suddenly drop the memstore size below the low water mark of the previous memstore size (which
could potentially be  the used size of the memstore)
> This is problematic because suddenly it blocks all the updates by suddenly causing a
situation where memstore used size is above high water mark. This has a very bad performance
impact on an otherwise fine HBase cluster. 



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