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From "Zhanwei.Wang (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3179) failed to append data, DataStreamer throw an exception, "nodes.length != original.length + 1" on single datanode cluster
Date Mon, 02 Apr 2012 20:55:25 GMT
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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