[jira] [Work started] (HBASE-19365) FSTableDescriptors#get() can return null reference, in some cases, it is not checked

["Josh Elser (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-19365?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HBASE-19365 started by Josh Elser.
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> FSTableDescriptors#get() can return null reference, in some cases, it is not checked
> ------------------------------------------------------------------------------------
>
>                 Key: HBASE-19365
>                 URL: https://issues.apache.org/jira/browse/HBASE-19365
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.2.6
>            Reporter: Hua Xiang
>            Assignee: Josh Elser
>            Priority: Minor
>
> In one of our cases, 1.2.0 based master could not start because the null reference is not checked. Master crashed because of the following exception.
> {code}
> 2017-11-20 08:30:20,178 FATAL org.apache.hadoop.hbase.master.HMaster: Failed to become active master
> java.lang.NullPointerException
> at org.apache.hadoop.hbase.master.AssignmentManager.rebuildUserRegions(AssignmentManager.java:2993)
> at org.apache.hadoop.hbase.master.AssignmentManager.joinCluster(AssignmentManager.java:494)
> at org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:821)
> at org.apache.hadoop.hbase.master.HMaster.access$500(HMaster.java:192)
> at org.apache.hadoop.hbase.master.HMaster$1.run(HMaster.java:1827)
> at java.lang.Thread.run(Thread.java:745)
> {code}



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