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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2975) Rename with overwrite flag true can make NameNode to stuck in safemode on NN (crash + restart).
Date Wed, 03 Sep 2014 13:41:51 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uma Maheswara Rao G updated HDFS-2975:
--------------------------------------
       Resolution: Fixed
    Fix Version/s: 2.6.0
                   3.0.0
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

I have just committed this to trunk and branch-2. Thanks a lot for the patch Yi.
Also thanks a lot, Vinay for the review!

> Rename with overwrite flag true can make NameNode to stuck in safemode on NN (crash +
restart).
> -----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-2975
>                 URL: https://issues.apache.org/jira/browse/HDFS-2975
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Uma Maheswara Rao G
>            Assignee: Yi Liu
>             Fix For: 3.0.0, 2.6.0
>
>         Attachments: HDFS-2975.001.patch, HDFS-2975.002.patch
>
>
> When we rename the file with overwrite flag as true, it will delete the destination file
blocks. After deleting the blocks, whenever it releases the fsNameSystem lock, NN can give
the invalidation work to corresponding DNs to delete the blocks.
> Parallaly it will sync the rename related edits to editlog file. At this step before
NN sync the edits if NN crashes, NN can stuck into safemode on restart. This is because block
already deleted from the DN as part of invalidations. But dst file still exist as rename edits
not persisted in log file and no DN will report that blocks now.
> This is similar to HDFS-2815
>  



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