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https://issues.apache.org/jira/browse/HDFS-1907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13030986#comment-13030986
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CW Chung commented on HDFS-1907:
--------------------------------
Stack Trace:
=========================
11/05/08 19:05:48 WARN hdfs.DFSClient: Failed to connect to /xxx.xx.xx.xxx:1004
for file /tmp/N/909NF for block
BP-1632719171-xxx.xx.xx.xxx-1303748685682:blk_-8940328094159486414_3653:java.io.IOException:
Got error for
OP_READ_BLOCK, self=/xxx.xx.xx.xxx:36405, remote=/xxx.xx.xx.xxx:1004, for file
/tmp/N/909NF, for pool
BP-1632719171-xxx.xx.xx.xxx-1303748685682 block -8940328094159486414_3653
at org.apache.hadoop.hdfs.BlockReader.newBlockReader(BlockReader.java:398)
at
org.apache.hadoop.hdfs.DFSInputStream.fetchBlockByteRange(DFSInputStream.java:631)
at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:704)
at org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:51)
....
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:192)
Caused by: org.apache.hadoop.hdfs.BlockMissingException: Could not obtain block:
BP-1632719171-xxx.xx.xx.xxx-1303748685682:blk_-8940328094159486414_3653
file=/tmp/N/909NF
at
org.apache.hadoop.hdfs.DFSInputStream.chooseDataNode(DFSInputStream.java:570)
at
org.apache.hadoop.hdfs.DFSInputStream.fetchBlockByteRange(DFSInputStream.java:618)
at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:704)
at org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:51)
> BlockMissingException upon concurrent read and write: reader was doing file
> position read while writer is doing write without hflush
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-1907
> URL: https://issues.apache.org/jira/browse/HDFS-1907
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs client
> Affects Versions: 0.23.0
> Environment: Run on a real cluster. Using the latest 0.23 build.
> Reporter: CW Chung
>
> BlockMissingException is thrown under this test scenario:
> Two different processes doing concurrent file r/w: one read and the other
> write on the same file
> - writer keep doing file write
> - reader doing position file read from beginning of the file to the visible
> end of file, repeatedly
> The reader is basically doing:
> byteRead = in.read(currentPosition, buffer, 0, byteToReadThisRound);
> where CurrentPostion=0, buffer is a byte array buffer, byteToReadThisRound =
> 1024*10000;
> Usually it does not fail right away. I have to read, close file, re-open the
> same file a few times to create the problem. I'll pose a test program to
> repro this problem after I've cleaned up a bit my current test program.
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