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Date: Thu, 20 Mar 2008 16:05:25 -0700 (PDT)
From: "Robert Chansler (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-1911) infinite loop in dfs -cat command.
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     [ https://issues.apache.org/jira/browse/HADOOP-1911?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Chansler updated HADOOP-1911:
------------------------------------

    Fix Version/s: 0.17.0

> infinite loop in dfs -cat command.
> ----------------------------------
>
>                 Key: HADOOP-1911
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1911
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.13.1, 0.14.3
>            Reporter: Koji Noguchi
>            Priority: Blocker
>             Fix For: 0.17.0
>
>
> [knoguchi]$ hadoop dfs -cat fileA
> 07/09/13 17:36:02 INFO fs.DFSClient: Could not obtain block 0 from any node: 
> java.io.IOException: No live nodes contain current block
> 07/09/13 17:36:20 INFO fs.DFSClient: Could not obtain block 0 from any node: 
> java.io.IOException: No live nodes contain current block
> [repeats forever]
> Setting one of the Debug statement to Warn, it kept on showing 
> {noformat} 
>  WARN org.apache.hadoop.fs.DFSClient: Failed to connect
> to /99.99.999.9 :11111:java.io.IOException: Recorded block size is 7496, but
> datanode reports size of 0
> 	at org.apache.hadoop.dfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:690)
> 	at org.apache.hadoop.dfs.DFSClient$DFSInputStream.read(DFSClient.java:771)
> 	at org.apache.hadoop.fs.FSDataInputStream$PositionCache.read(FSDataInputStream.java:41)
> 	at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
> 	at java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
> 	at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
> 	at java.io.DataInputStream.readFully(DataInputStream.java:178)
> 	at java.io.DataInputStream.readFully(DataInputStream.java:152)
> 	at org.apache.hadoop.fs.ChecksumFileSystem$FSInputChecker.(ChecksumFileSystem.java:123)
> 	at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:340)
> 	at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:259)
> 	at org.apache.hadoop.util.CopyFiles$FSCopyFilesMapper.map(CopyFiles.java:466)
> 	at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:48)
> 	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:186)
> 	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1707)
> {noformat} 
> Turns out fileA was corrupted. Fsck showed crc file of 7496 bytes, but when I searched for the blocks on each node, 3 replicas were all size 0.
> Not sure how it got corrupted, but it would be nice if the dfs command fail instead of getting into an infinite loop.

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