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https://issues.apache.org/jira/browse/HBASE-18560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16122388#comment-16122388
 ] 

Umesh Agashe commented on HBASE-18560:
--------------------------------------

Here is the stack trace:
{code}
Exception in thread "AssignmentThread" java.lang.NullPointerException
        at 
org.apache.hadoop.hbase.util.VersionInfo.compareVersion(VersionInfo.java:117)
        at 
org.apache.hadoop.hbase.master.assignment.AssignmentManager.lambda$getExcludedServersForSystemTable$4(AssignmentManager.java:1794)
        at java.util.Collections.max(Collections.java:712)
        at 
org.apache.hadoop.hbase.master.assignment.AssignmentManager.getExcludedServersForSystemTable(AssignmentManager.java:1793)
        at 
org.apache.hadoop.hbase.master.assignment.AssignmentManager.processAssignQueue(AssignmentManager.java:1687)
        at 
org.apache.hadoop.hbase.master.assignment.AssignmentManager.access$300(AssignmentManager.java:105)
        at 
org.apache.hadoop.hbase.master.assignment.AssignmentManager$2.run(AssignmentManager.java:1582)
{code}

> Test master.assignment.TestAssignmentManager hangs on master and its in flaky 
> list
> ----------------------------------------------------------------------------------
>
>                 Key: HBASE-18560
>                 URL: https://issues.apache.org/jira/browse/HBASE-18560
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.0
>            Reporter: Umesh Agashe
>            Assignee: Umesh Agashe
>             Fix For: 2.0.0
>
>         Attachments: hbase-18560.master.001.patch
>
>
> Test master.assignment.TestAssignmentManager hangs on master and showing up 
> in flaky list



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