Somehow I forgot to add the stack trace. Anything with <> around it is just
things I have substituted out for privacy reasons :)
2011-07-18 15:59:38,008 WARN org.apache.hadoop.mapred.Child: Error running child
java.io.FileNotFoundException: File does not exist:
/sdb1/mapred/taskTracker/<username>/distcache/4832436332923632778_998360924_1057744747/<node
IP>/tmp/hadoop-tmpdir/mapred/staging/<username>/.staging/job_201107151351_0015/files/joinData.txt
at
org.apache.hadoop.hdfs.DFSClient$DFSInputStream.openInfo(DFSClient.java:1602)
at
org.apache.hadoop.hdfs.DFSClient$DFSInputStream.<init>(DFSClient.java:1593)
at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:428)
at
org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:187)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:456)
at
<package>.SubsetOfIndivComparisonsAcrossMultipleMarkersSequenceFileMapper.setup(SubsetOfIndivComparisonsAcrossMultipleMarkersSequenceFileMapper.java:32)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:142)
at
org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:646)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:322)
at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115)
at org.apache.hadoop.mapred.Child.main(Child.java:262)
From: GOEKE, MATTHEW [AG/1000]
Sent: Monday, July 18, 2011 4:54 PM
To: [email protected]
Cc: GOEKE, MATTHEW [AG/1000]
Subject: Distributed cache not working
All,
I cannot confirm if this is an issue with my code / usage or if I am actually
running into a framework issue. I just ran a job that uses the exact same
method and it works perfectly which makes me think I am missing something minor.
I have Tool implemented for my main class and I am using -files on the command
line to pass it a local URI. I use the code below to access the file in the
setup method of the mapper:
...
try{
Path[] cacheFiles =
DistributedCache.getLocalCacheFiles(context.getConfiguration());
if (cacheFiles != null && cacheFiles.length > 0){
System.out.println("Reading data from DistributedCache: " +
cacheFiles[0].toString() + "\n");
FileSystem fs = FileSystem.get(context.getConfiguration());
FSDataInputStream scoresInputStream = fs.open(cacheFiles[0]);
...
The only thing I can think of is the file size is substantially different (6MB
vs 90MB) but with the network backend we have it should be less than a 2 second
difference between the file being there or not. Is it possible that the file
has not propagated by the time it is attempted to be accessed and are there
hooks in there to not start until files have been fully distributed?
Matt
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