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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4647) llegalStateException in put with nested snapshottable directories
Date Fri, 29 Mar 2013 01:29:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13616953#comment-13616953
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Jing Zhao commented on HDFS-4647:
---------------------------------

This is caused by rename - the put command will first write data to a temp file then rename
it to the given path. I have tried removing the rename step of the put operation and the illegalStateException
is gone. 

I also added more debug information to all the Preconditions.checkState statement. With the
current rename code (with HDFS-4534 and HDFS-4611), the illegalStateException is thrown from
ChildrenDiff#replace, in the "Preconditions.checkState(removed == oldChild" statement. Seems
the oldChild is an INodeFile while the removed inode is an INodeReference. 
                
> llegalStateException in put with nested snapshottable directories
> -----------------------------------------------------------------
>
>                 Key: HDFS-4647
>                 URL: https://issues.apache.org/jira/browse/HDFS-4647
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: Snapshot (HDFS-2802)
>            Reporter: Arpit Agarwal
>             Fix For: Snapshot (HDFS-2802)
>
>
> To repro:
> hadoop fs -mkdir -p /1/2/3
> hdfs dfsadmin -allowSnapsot /1
> hdfs dfsadmin -allowSnapsot /2
> hadoop fs -createSnapshot /1 snap1
> hadoop fs -put f1 /1/2/3
> Final command throws:
> put: java.lang.IllegalStateException

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