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https://issues.apache.org/jira/browse/HDFS-13212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16387468#comment-16387468
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Weiwei Wu commented on HDFS-13212:
----------------------------------

MountTableResolver will add a locationCache with null sourcePath, this will 
cause a null pointer exception when invalidateLocationCache try to remove it.

Add some code to fix this bug. 

> RBF: Fix router location cache issue
> ------------------------------------
>
>                 Key: HDFS-13212
>                 URL: https://issues.apache.org/jira/browse/HDFS-13212
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: federation, hdfs
>            Reporter: Weiwei Wu
>            Priority: Major
>         Attachments: HDFS-13212-001.patch, HDFS-13212-002.patch, 
> HDFS-13212-003.patch
>
>
> The MountTableResolver refreshEntries function have a bug when add a new 
> mount table entry which already have location cache. The old location cache 
> will never be invalid until this mount point change again.
> Need to invalid the location cache when add the mount table entries.



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