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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16093) Splits failed before creating daughter regions leave meta inconsistent
Date Thu, 30 Jun 2016 00:30:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15356252#comment-15356252
] 

Hudson commented on HBASE-16093:
--------------------------------

SUCCESS: Integrated in HBase-1.1-JDK7 #1737 (See [https://builds.apache.org/job/HBase-1.1-JDK7/1737/])
HBASE-16093 Fix splits failed before creating daughter regions leave (busbey: rev 45a6d8403cdaed06133dba6fa74e6f80603d2ba5)
* hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java


> Splits failed before creating daughter regions leave meta inconsistent
> ----------------------------------------------------------------------
>
>                 Key: HBASE-16093
>                 URL: https://issues.apache.org/jira/browse/HBASE-16093
>             Project: HBase
>          Issue Type: Bug
>          Components: master, Region Assignment
>    Affects Versions: 1.3.0, 1.2.1
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>            Priority: Critical
>             Fix For: 1.3.0, 1.4.0, 1.2.2, 1.1.6
>
>         Attachments: HBASE-16093.branch-1.patch
>
>
> This is on branch-1 based code only.
> Here's the sequence of events.
> # A regionserver opens a new region. That regions looks like it should split.
> # So the regionserver starts a split transaction.
> # Split transaction starts execute
> # Split transaction encounters an error in stepsBeforePONR
> # Split transaction starts rollback
> # Split transaction notifies master that it's rolling back using HMasterRpcServices#reportRegionStateTransition
> # AssignmentManager#onRegionTransition is called with SPLIT_REVERTED
> # AssignmentManager#onRegionSplitReverted is called.
> # That onlines the parent region and offlines the daughter regions.
> However the daughter regions were never created in meta so all that gets done is that
state for those rows gets OFFLINE. Now all clients trying to get the parent instead get the
offline daughter.



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