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From "Roman Shaposhnik (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4600) HDFS file append failing in multinode cluster
Date Fri, 15 Mar 2013 19:50:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13603760#comment-13603760
] 

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

bq. the over-replication will eventually go away as NN will balance the number of replicas
once and if the original DNs are back.

Right. But in the meantime APPEND would be unavailable to *unsuspecting* applications.
                
> 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: Minor
>             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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