[jira] Updated: (HBASE-3283) NPE in AssignmentManager if processing shutdown of RS who doesn't have any regions assigned to it

["Jonathan Gray (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-3283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Gray updated HBASE-3283:
---------------------------------

    Status: Patch Available  (was: Open)

> NPE in AssignmentManager if processing shutdown of RS who doesn't have any regions assigned to it
> -------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-3283
>                 URL: https://issues.apache.org/jira/browse/HBASE-3283
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.90.0
>            Reporter: Jonathan Gray
>            Assignee: Jonathan Gray
>             Fix For: 0.90.0, 0.92.0
>
>         Attachments: HBASE-3283-v1.patch
>
>
> When doing server shutdown, we do the following:
> {noformat}
> deadRegions = new TreeSet<HRegionInfo>(this.servers.remove(hsi));
> {noformat}
> This removes the list of regions currently assigned to the specified server from the master in-memory state.  But it's possible that the remove returns null (have seen it in running production cluster).
> We should check if this is null and just return if so.

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