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Date: Wed, 11 Apr 2012 17:55:20 +0000 (UTC)
From: "Tsz Wo (Nicholas), SZE (Updated) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-3179) Improve the error message:
 DataStreamer throw an exception, "nodes.length != original.length + 1" on
 single datanode cluster
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     [ https://issues.apache.org/jira/browse/HDFS-3179?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE updated HDFS-3179:
-----------------------------------------

       Resolution: Fixed
    Fix Version/s: 2.0.0
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

Uma, thanks for the review.

I have committed this.
                
> Improve the error message: DataStreamer throw an exception, "nodes.length != original.length + 1" on single datanode cluster
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3179
>                 URL: https://issues.apache.org/jira/browse/HDFS-3179
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client
>    Affects Versions: 0.23.2
>            Reporter: Zhanwei.Wang
>            Assignee: Tsz Wo (Nicholas), SZE
>             Fix For: 2.0.0
>
>         Attachments: h3179_20120403.patch
>
>
> Create a single datanode cluster
> disable permissions
> enable webhfds
> start hdfs
> run the test script
> expected result:
> a file named "test" is created and the content is "testtest"
> the result I got:
> hdfs throw an exception on the second append operation.
> {code}
> ./test.sh 
> {"RemoteException":{"exception":"IOException","javaClassName":"java.io.IOException","message":"Failed to add a datanode: nodes.length != original.length + 1, nodes=[127.0.0.1:50010], original=[127.0.0.1:50010]"}}
> {code}
> Log in datanode:
> {code}
> 2012-04-02 14:34:21,058 WARN org.apache.hadoop.hdfs.DFSClient: DataStreamer Exception
> java.io.IOException: Failed to add a datanode: nodes.length != original.length + 1, nodes=[127.0.0.1:50010], original=[127.0.0.1:50010]
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.findNewDatanode(DFSOutputStream.java:778)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:834)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:930)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:461)
> 2012-04-02 14:34:21,059 ERROR org.apache.hadoop.hdfs.DFSClient: Failed to close file /test
> java.io.IOException: Failed to add a datanode: nodes.length != original.length + 1, nodes=[127.0.0.1:50010], original=[127.0.0.1:50010]
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.findNewDatanode(DFSOutputStream.java:778)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:834)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:930)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:461)
> {code}
> test.sh
> {code}
> #!/bin/sh
> echo "test" > test.txt
> curl -L -X PUT "http://localhost:50070/webhdfs/v1/test?op=CREATE"
> curl -L -X POST -T test.txt "http://localhost:50070/webhdfs/v1/test?op=APPEND"
> curl -L -X POST -T test.txt "http://localhost:50070/webhdfs/v1/test?op=APPEND"
> {code}

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