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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4273) java.lang.NullPointerException when a table is being disabled and HMaster restarts
Date Mon, 29 Aug 2011 11:41:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13092778#comment-13092778
] 

ramkrishna.s.vasudevan commented on HBASE-4273:
-----------------------------------------------

@MingMa
bq.For some reason, the regionLocation isn't set in .META. table for some regions
May be we need to find how to handle such scenarios.
Need to get a new regionLocation and allocate to that RS.

> java.lang.NullPointerException when a table is being disabled and HMaster restarts
> ----------------------------------------------------------------------------------
>
>                 Key: HBASE-4273
>                 URL: https://issues.apache.org/jira/browse/HBASE-4273
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>
> This bug occurs in following scenario. 
> 1. For some reason, the regionLocation isn't set in .META. table for some regions. Perhaps
createTable didn't complete successfully.
> 1. The table of those regions is being disabled.
> 2. HMaster restarted.
> 3. At HMaster startup, it tries to transition from disabling to disabled state. It got
the following exception.
> java.lang.NullPointerException: Passed server is null
>         at
> org.apache.hadoop.hbase.master.ServerManager.sendRegionClose(ServerManager.
> java:581)
>         at
> org.apache.hadoop.hbase.master.AssignmentManager.unassign(AssignmentManager
> .java:1093)
>         at
> org.apache.hadoop.hbase.master.AssignmentManager.unassign(AssignmentManager
> .java:1040)
>         at
> org.apache.hadoop.hbase.master.handler.DisableTableHandler$BulkDisabler$1.r
> un(DisableTableHandler.java:132)
>         at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.j
> ava:886)
> In AssignmentManager.rebuildUserRegions, it added such regions to its regions list,
>       if (regionLocation == null) {
>         // Region not being served, add to region map with no assignment
>         // If this needs to be assigned out, it will also be in ZK as RIT
>         // add if the table is not in disabled and enabling state
>         if (false == checkIfRegionBelongsToDisabled(regionInfo)
>             && false == checkIfRegionsBelongsToEnabling(regionInfo)) {
>           regions.put(regionInfo, regionLocation);
>         }
> Perhaps, it should be
>       if (regionLocation == null) {
>         // Region not being served, add to region map with no assignment
>         // If this needs to be assigned out, it will also be in ZK as RIT
>         // add if the table is not in disabled and enabling state
>         if (true == checkIfRegionBelongsToEnabled(regionInfo) {
>           regions.put(regionInfo, regionLocation);
>         }

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