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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5428) under construction files deletion after snapshot+checkpoint+nn restart leads nn safemode
Date Tue, 19 Nov 2013 19:47:22 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5428?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jing Zhao updated HDFS-5428:
----------------------------

            Priority: Blocker  (was: Major)
    Target Version/s: 2.2.1

> under construction files deletion after snapshot+checkpoint+nn restart leads nn safemode
> ----------------------------------------------------------------------------------------
>
>                 Key: HDFS-5428
>                 URL: https://issues.apache.org/jira/browse/HDFS-5428
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: snapshots
>    Affects Versions: 3.0.0, 2.2.0
>            Reporter: Vinay
>            Assignee: Jing Zhao
>            Priority: Blocker
>             Fix For: 2.3.0
>
>         Attachments: HDFS-5428-v2.patch, HDFS-5428.000.patch, HDFS-5428.001.patch, HDFS-5428.002.patch,
HDFS-5428.003.patch, HDFS-5428.004.patch, HDFS-5428.patch
>
>
> 1. allow snapshots under dir /foo
> 2. create a file /foo/test/bar and start writing to it
> 3. create a snapshot s1 under /foo after block is allocated and some data has been written
to it
> 4. Delete the directory /foo/test
> 5. wait till checkpoint or do saveNameSpace
> 6. restart NN.
> NN enters to safemode.
> Analysis:
> Snapshot nodes loaded from fsimage are always complete and all blocks will be in COMPLETE
state. 
> So when the Datanode reports RBW blocks those will not be updated in blocksmap.
> Some of the FINALIZED blocks will be marked as corrupt due to length mismatch.



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