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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4850) fix OfflineImageViewer to work on fsimages with empty files or snapshots
Date Fri, 31 May 2013 17:12:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13671660#comment-13671660
] 

Jing Zhao commented on HDFS-4850:
---------------------------------

I ran TestSnapshot 200 times last night and they all passed.
                
> fix OfflineImageViewer to work on fsimages with empty files or snapshots
> ------------------------------------------------------------------------
>
>                 Key: HDFS-4850
>                 URL: https://issues.apache.org/jira/browse/HDFS-4850
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: tools
>            Reporter: Stephen Chu
>            Assignee: Jing Zhao
>              Labels: snapshot
>         Attachments: datadirs.tar.gz, fsimage_0000000000000000004, fsimage_0000000000000000008,
HDFS-4850.000.patch, HDFS-4850.001.patch, oiv_out_1, oiv_out_2
>
>
> I deployed hadoop-trunk HDFS and created _/user/schu/_. I then forced a checkpoint, fetched
the fsimage, and ran the default OfflineImageViewer successfully on the fsimage.
> {code}
> schu-mbp:~ schu$ hdfs oiv -i fsimage_0000000000000000004 -o oiv_out_1
> schu-mbp:~ schu$ cat oiv_out_1
> drwxr-xr-x  -     schu supergroup          0 2013-05-24 16:59 /
> drwxr-xr-x  -     schu supergroup          0 2013-05-24 16:59 /user
> drwxr-xr-x  -     schu supergroup          0 2013-05-24 16:59 /user/schu
> schu-mbp:~ schu$ 
> {code}
> I then touched an empty file _/user/schu/testFile1_
> {code}
> schu-mbp:~ schu$ hadoop fs -lsr /
> lsr: DEPRECATED: Please use 'ls -R' instead.
> drwxr-xr-x   - schu supergroup          0 2013-05-24 16:59 /user
> drwxr-xr-x   - schu supergroup          0 2013-05-24 17:00 /user/schu
> -rw-r--r--   1 schu supergroup          0 2013-05-24 17:00 /user/schu/testFile1
> {code}
> and forced another checkpoint, fetched the fsimage, and reran the OfflineImageViewer.
I encountered a NegativeArraySizeException:
> {code}
> schu-mbp:~ schu$ hdfs oiv -i fsimage_0000000000000000008 -o oiv_out_2
> Input ended unexpectedly.
> 2013-05-24 17:01:13,622 ERROR [main] offlineImageViewer.OfflineImageViewer (OfflineImageViewer.java:go(140))
- image loading failed at offset 402
> Exception in thread "main" java.lang.NegativeArraySizeException
> 	at org.apache.hadoop.io.Text.readString(Text.java:458)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.ImageLoaderCurrent.processPermission(ImageLoaderCurrent.java:370)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.ImageLoaderCurrent.processINode(ImageLoaderCurrent.java:671)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.ImageLoaderCurrent.processChildren(ImageLoaderCurrent.java:557)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.ImageLoaderCurrent.processDirectoryWithSnapshot(ImageLoaderCurrent.java:464)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.ImageLoaderCurrent.processDirectoryWithSnapshot(ImageLoaderCurrent.java:470)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.ImageLoaderCurrent.processDirectoryWithSnapshot(ImageLoaderCurrent.java:470)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.ImageLoaderCurrent.processLocalNameINodesWithSnapshot(ImageLoaderCurrent.java:444)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.ImageLoaderCurrent.processINodes(ImageLoaderCurrent.java:398)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.ImageLoaderCurrent.loadImage(ImageLoaderCurrent.java:199)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.OfflineImageViewer.go(OfflineImageViewer.java:136)
> 	at org.apache.hadoop.hdfs.tools.offlineImageViewer.OfflineImageViewer.main(OfflineImageViewer.java:260)
> {code}
> This is reproducible. I've reproduced this scenario after formatting HDFS and restarting
and touching an empty file _/testFile1_.
> Attached are the data dirs, the fsimage before creating the empty file (fsimage_0000000000000000004)
and the fsimage afterwards (fsimage_0000000000000000004) and their outputs, oiv_out_1 and
oiv_out_2 respectively.
> The oiv_out_2 does not include the empty _/user/schu/testFile1_.
> I don't run into this problem using hadoop-2.0.4-alpha.

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