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From "Yi Liang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16234) Expect and handle nulls when assigning replicas
Date Tue, 26 Jul 2016 23:43:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15394780#comment-15394780

Yi Liang commented on HBASE-16234:

Hi [~chenheng], 
    thanks for reviewing, i just read through the AssignmentManager.java file. I found there
are same problem at other places in this file, some place handle the exception, some place
not (nullpointer not belong to IOException). So in V2, I fix all the similar problems and
make all the fix consistency. Could you take a look, thanks.   

> Expect and handle nulls when assigning replicas
> -----------------------------------------------
>                 Key: HBASE-16234
>                 URL: https://issues.apache.org/jira/browse/HBASE-16234
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>    Affects Versions: 2.0.0
>            Reporter: Harsh J
>            Assignee: Yi Liang
>         Attachments: HBASE-16234-V1.patch, HBASE-16234-V1.patch, HBASE-16234-V2.patch
> Observed this on a cluster:
> {code}
> FATAL org.apache.hadoop.hbase.master.HMaster: Unhandled exception. Starting shutdown.

> java.lang.NullPointerException 
> at org.apache.hadoop.hbase.master.AssignmentManager.replicaRegionsNotRecordedInMeta(AssignmentManager.java:2799)

> at org.apache.hadoop.hbase.master.AssignmentManager.assignAllUserRegions(AssignmentManager.java:2778)

> at org.apache.hadoop.hbase.master.AssignmentManager.processDeadServersAndRegionsInTransition(AssignmentManager.java:638)

> at org.apache.hadoop.hbase.master.AssignmentManager.joinCluster(AssignmentManager.java:485)

> at org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:723)

> at org.apache.hadoop.hbase.master.HMaster.access$500(HMaster.java:169) 
> at org.apache.hadoop.hbase.master.HMaster$1.run(HMaster.java:1481) 
> at java.lang.Thread.run(Thread.java:745) 
> {code}
> It looks like {{FSTableDescriptors#get(…)}} can be expected to return null in some
cases, but {{AssignmentManager.replicaRegionsNotRecordedInMeta(…)}} does not currently have
any handling for such a possibility.

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