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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