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From Íñigo Goiri (JIRA) <j...@apache.org>
Subject [jira] [Commented] (HDFS-13212) RBF: Fix router location cache issue
Date Thu, 08 Mar 2018 17:55:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16391628#comment-16391628
] 

Íñigo Goiri commented on HDFS-13212:
------------------------------------

After a deeper look, the part that concerns me is the following:
{code}
485	    // Add the default location and test location cache
486	    assertEquals("null->/testlocationcache",
487	            mountTable.getDestinationForPath("/testlocationcache").toString());
{code}
The fact that is returning null is weird.
My guess is that the default location is {{null}} but we should have some other as default
and verify that once we remove the entry, we go to that default.
So I would make say 0 the default and then assert we point there.

> 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
>            Assignee: Weiwei Wu
>            Priority: Major
>         Attachments: HDFS-13212-001.patch, HDFS-13212-002.patch, HDFS-13212-003.patch,
HDFS-13212-004.patch, HDFS-13212-005.patch, HDFS-13212-006.patch, HDFS-13212-007.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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