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From Yaozhen Pan <itzhak....@gmail.com>
Subject Does hadoop local mode support running multiple jobs in different threads?
Date Fri, 01 Jul 2011 12:42:38 GMT
Hi,

I am not sure if this question (as title) has been asked before, but I
didn't find an answer by googling.

I'd like to explain the scenario of my problem:
My program launches several threads in the same time, while each thread will
submit a hadoop job and wait for the job to complete.
The unit tests were run in local mode, mini-cluster and the real hadoop
cluster.
I found the unit tests may fail in local mode, but they always succeeded in
mini-cluster and real hadoop cluster.
When unit test failed in local mode, the causes may be different (stack
traces are posted at the end of mail).

It seems multi-thead running multiple jobs is not supported in local mode,
is it?

Error 1:
2011-07-01 20:24:36,460 WARN  [Thread-38] mapred.LocalJobRunner
(LocalJobRunner.java:run(256)) - job_local_0001
java.io.FileNotFoundException: File
build/test/tmp/mapred/local/taskTracker/jobcache/job_local_0001/attempt_local_0001_m_000000_0/output/spill0.out
does not exist.
at
org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:361)
at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:192)
at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:142)
at
org.apache.hadoop.fs.RawLocalFileSystem.rename(RawLocalFileSystem.java:253)
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.mergeParts(MapTask.java:1447)
at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1154)
at
org.apache.hadoop.mapred.MapTask$NewOutputCollector.close(MapTask.java:549)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:623)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:177)

Error 2:
2011-07-01 19:00:25,546 INFO  [Thread-32] fs.FSInputChecker
(FSInputChecker.java:readChecksumChunk(247)) - Found checksum error: b[3584,
4096]=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
org.apache.hadoop.fs.ChecksumException: Checksum error:
file:/home/hadoop-user/hadoop-proj/build/test/tmp/mapred/system/job_local_0003/job.xml
at 3584
at org.apache.hadoop.fs.FSInputChecker.verifySum(FSInputChecker.java:277)
at
org.apache.hadoop.fs.FSInputChecker.readChecksumChunk(FSInputChecker.java:241)
at org.apache.hadoop.fs.FSInputChecker.read1(FSInputChecker.java:189)
at org.apache.hadoop.fs.FSInputChecker.read(FSInputChecker.java:158)
at java.io.DataInputStream.read(DataInputStream.java:83)
at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:49)
at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:87)
at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:209)
at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:142)
at
org.apache.hadoop.fs.LocalFileSystem.copyToLocalFile(LocalFileSystem.java:61)
at org.apache.hadoop.fs.FileSystem.copyToLocalFile(FileSystem.java:1197)
at
org.apache.hadoop.mapred.LocalJobRunner$Job.<init>(LocalJobRunner.java:92)
at
org.apache.hadoop.mapred.LocalJobRunner.submitJob(LocalJobRunner.java:373)
at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:800)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:432)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:448)
at hadoop.GroupingRunnable.run(GroupingRunnable.java:126)
at java.lang.Thread.run(Thread.java:619)

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