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https://issues.apache.org/jira/browse/HADOOP-1619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hairong Kuang updated HADOOP-1619:
----------------------------------

    Attachment: skip.patch

skip of DFSClient is synchronized.

> FSInputChecker attempts to seek past EOF
> ----------------------------------------
>
>                 Key: HADOOP-1619
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1619
>             Project: Hadoop
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.14.0
>            Reporter: Nigel Daley
>            Assignee: Hairong Kuang
>            Priority: Blocker
>             Fix For: 0.14.0
>
>         Attachments: skip.patch, skip.patch
>
>
> I'm not sure which class in the stack trace below is responsible for 
> attempting to seek past the end of file. 
> 2007-07-16 20:31:40,598 INFO org.apache.hadoop.mapred.TaskInProgress: Error 
> from task_200707162028_0014_m_000000_0: java.io.IOException: Cannot seek 
> after EOF
>       at 
> org.apache.hadoop.dfs.DFSClient$DFSInputStream.seek(DFSClient.java:1040)
>       at 
> org.apache.hadoop.fs.FSDataInputStream.seek(FSDataInputStream.java:37)
>       at 
> org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSInputChecker.readChunk(ChecksumFileSystem.java:188)
>       at 
> org.apache.hadoop.fs.FSInputChecker.readChecksumChunk(FSInputChecker.java:234)
>       at org.apache.hadoop.fs.FSInputChecker.fill(FSInputChecker.java:176)
>       at org.apache.hadoop.fs.FSInputChecker.read1(FSInputChecker.java:193)
>       at org.apache.hadoop.fs.FSInputChecker.read(FSInputChecker.java:157)
>       at 
> org.apache.hadoop.fs.FSInputChecker.readFully(FSInputChecker.java:353)
>       at org.apache.hadoop.fs.FSInputChecker.seek(FSInputChecker.java:331)
>       at org.apache.hadoop.fs.FSInputChecker.skip(FSInputChecker.java:306)
>       at java.io.FilterInputStream.skip(FilterInputStream.java:125)
>       at java.io.FilterInputStream.skip(FilterInputStream.java:125)
>       at 
> com.yahoo.pig.impl.io.InputStreamPosition.skip(InputStreamPosition.java:55)
>       at java.io.BufferedInputStream.skip(BufferedInputStream.java:349)
>       at java.io.FilterInputStream.skip(FilterInputStream.java:125)
>       at 
> com.yahoo.pig.impl.builtin.RandomSampleLoader.getNext(RandomSampleLoader.java:34)
>       at 
> com.yahoo.pig.impl.mapreduceExec.PigInputFormat$PigRecordReader.next(PigInputFormat.java:169)
>       at org.apache.hadoop.mapred.MapTask$1.next(MapTask.java:171)
>       at 
> com.yahoo.pig.impl.mapreduceExec.PigMapReduce.run(PigMapReduce.java:98)
>       at org.apache.hadoop.mapred.MapTask.run(MapTask.java:189)
>       at 
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1771)

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