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From "Roman Shaposhnik (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4600) HDFS file append failing in multinode cluster
Date Thu, 14 Mar 2013 02:42:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13601986#comment-13601986
] 

Roman Shaposhnik commented on HDFS-4600:
----------------------------------------

It is indeed a 2 nodes cluster. That said, the first write to the file actually succeeds and
it is only the append call that fails. The cluster is also fully functional wrt. the hadoop
fs use. I can copy stuff in/out of it.
                
> HDFS file append failing in multinode cluster
> ---------------------------------------------
>
>                 Key: HDFS-4600
>                 URL: https://issues.apache.org/jira/browse/HDFS-4600
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.3-alpha
>            Reporter: Roman Shaposhnik
>            Priority: Blocker
>             Fix For: 2.0.4-alpha
>
>         Attachments: core-site.xml, hdfs-site.xml, X.java
>
>
> NOTE: the following only happens in a fully distributed setup (core-site.xml and hdfs-site.xml
are attached)
> Steps to reproduce:
> {noformat}
> $ javac -cp /usr/lib/hadoop/client/\* X.java
> $ echo aaaaa > a.txt
> $ hadoop fs -ls /tmp/a.txt
> ls: `/tmp/a.txt': No such file or directory
> $ HADOOP_CLASSPATH=`pwd` hadoop X /tmp/a.txt
> 13/03/13 16:05:14 WARN hdfs.DFSClient: DataStreamer Exception
> java.io.IOException: Failed to replace a bad datanode on the existing pipeline due to
no more good datanodes being available to try. (Nodes: current=[10.10.37.16:50010, 10.80.134.126:50010],
original=[10.10.37.16:50010, 10.80.134.126:50010]). The current failed datanode replacement
policy is DEFAULT, and a client may configure this via 'dfs.client.block.write.replace-datanode-on-failure.policy'
in its configuration.
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.findNewDatanode(DFSOutputStream.java:793)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:858)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:964)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:470)
> Exception in thread "main" java.io.IOException: Failed to replace a bad datanode on the
existing pipeline due to no more good datanodes being available to try. (Nodes: current=[10.10.37.16:50010,
10.80.134.126:50010], original=[10.10.37.16:50010, 10.80.134.126:50010]). The current failed
datanode replacement policy is DEFAULT, and a client may configure this via 'dfs.client.block.write.replace-datanode-on-failure.policy'
in its configuration.
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.findNewDatanode(DFSOutputStream.java:793)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:858)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:964)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:470)
> 13/03/13 16:05:14 ERROR hdfs.DFSClient: Failed to close file /tmp/a.txt
> java.io.IOException: Failed to replace a bad datanode on the existing pipeline due to
no more good datanodes being available to try. (Nodes: current=[10.10.37.16:50010, 10.80.134.126:50010],
original=[10.10.37.16:50010, 10.80.134.126:50010]). The current failed datanode replacement
policy is DEFAULT, and a client may configure this via 'dfs.client.block.write.replace-datanode-on-failure.policy'
in its configuration.
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.findNewDatanode(DFSOutputStream.java:793)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:858)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:964)
> 	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:470)
> {noformat}
> Given that the file actually does get created:
> {noformat}
> $ hadoop fs -ls /tmp/a.txt
> Found 1 items
> -rw-r--r--   3 root hadoop          6 2013-03-13 16:05 /tmp/a.txt
> {noformat}
> this feels like a regression in APPEND's functionality.

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