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From "Zhanwei.Wang (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3179) failed to append data, DataStreamer throw an exception, "nodes.length != original.length + 1" on single datanode cluster
Date Tue, 03 Apr 2012 17:10:23 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13245501#comment-13245501
] 

Zhanwei.Wang commented on HDFS-3179:
------------------------------------

@Uma and amith
Another question, in this test script, I first create a new EMPTY file and append to the file
twice.
The first append succeed because file is empty, to create a pipeline, the "stage" is PIPELINE_SETUP_CREATE
and the policy will not be checked.
The second append failed because the "stage" is PIPELINE_SETPU_APPEND and the policy will
be checked.

So from the view of user, the first append succeed while the second fail, is that a good idea?

{code}
          // get new block from namenode
          if (stage == BlockConstructionStage.PIPELINE_SETUP_CREATE) {
            if(DFSClient.LOG.isDebugEnabled()) {
              DFSClient.LOG.debug("Allocating new block");
            }
            nodes = nextBlockOutputStream(src);
            initDataStreaming();
          } else if (stage == BlockConstructionStage.PIPELINE_SETUP_APPEND) {
            if(DFSClient.LOG.isDebugEnabled()) {
              DFSClient.LOG.debug("Append to block " + block);
            }
            setupPipelineForAppendOrRecovery();  //check the policy here
            initDataStreaming();
          }
{code}
                
> failed to append data, 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: Bug
>          Components: data-node
>    Affects Versions: 0.23.2
>            Reporter: Zhanwei.Wang
>            Priority: Critical
>
> 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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