infinite loop in dfs -cat command.
----------------------------------
Key: HADOOP-1911
URL: https://issues.apache.org/jira/browse/HADOOP-1911
Project: Hadoop
Issue Type: Bug
Components: dfs
Affects Versions: 0.13.1
Reporter: Koji Noguchi
[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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