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https://issues.apache.org/jira/browse/MAPREDUCE-6441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16153860#comment-16153860
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Haibo Chen commented on MAPREDUCE-6441:
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bq. but I haven't managed to get it to fail with the old code
My understanding is that the new test is supposed to fail with the old code and
the new change is supposed to fix the test failure. Otherwise, the new test is
not testing any new behavior, right?
> Improve temporary directory name generation in LocalDistributedCacheManager
> for concurrent processes
> ----------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6441
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6441
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: William Watson
> Assignee: Ray Chiang
> Attachments: HADOOP-10924.02.patch,
> HADOOP-10924.03.jobid-plus-uuid.patch, MAPREDUCE-6441.004.patch,
> MAPREDUCE-6441.005.patch, MAPREDUCE-6441.006.patch
>
>
> Kicking off many sqoop processes in different threads results in:
> {code}
> 2014-08-01 13:47:24 -0400: INFO - 14/08/01 13:47:22 ERROR tool.ImportTool:
> Encountered IOException running import job: java.io.IOException:
> java.util.concurrent.ExecutionException: java.io.IOException: Rename cannot
> overwrite non empty destination directory
> /tmp/hadoop-hadoop/mapred/local/1406915233073
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.hadoop.mapred.LocalDistributedCacheManager.setup(LocalDistributedCacheManager.java:149)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.hadoop.mapred.LocalJobRunner$Job.<init>(LocalJobRunner.java:163)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.hadoop.mapred.LocalJobRunner.submitJob(LocalJobRunner.java:731)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:432)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.hadoop.mapreduce.Job$10.run(Job.java:1285)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.hadoop.mapreduce.Job$10.run(Job.java:1282)
> 2014-08-01 13:47:24 -0400: INFO - at
> java.security.AccessController.doPrivileged(Native Method)
> 2014-08-01 13:47:24 -0400: INFO - at
> javax.security.auth.Subject.doAs(Subject.java:415)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.hadoop.mapreduce.Job.submit(Job.java:1282)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1303)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.sqoop.mapreduce.ImportJobBase.doSubmitJob(ImportJobBase.java:186)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.sqoop.mapreduce.ImportJobBase.runJob(ImportJobBase.java:159)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.sqoop.mapreduce.ImportJobBase.runImport(ImportJobBase.java:239)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.sqoop.manager.SqlManager.importQuery(SqlManager.java:645)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:415)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.sqoop.tool.ImportTool.run(ImportTool.java:502)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.sqoop.Sqoop.run(Sqoop.java:145)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:181)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.sqoop.Sqoop.runTool(Sqoop.java:220)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.sqoop.Sqoop.runTool(Sqoop.java:229)
> 2014-08-01 13:47:24 -0400: INFO - at
> org.apache.sqoop.Sqoop.main(Sqoop.java:238)
> {code}
> If two are kicked off in the same second. The issue is the following lines of
> code in the org.apache.hadoop.mapred.LocalDistributedCacheManager class:
> {code}
> // Generating unique numbers for FSDownload.
> AtomicLong uniqueNumberGenerator =
> new AtomicLong(System.currentTimeMillis());
> {code}
> and
> {code}
> Long.toString(uniqueNumberGenerator.incrementAndGet())),
> {code}
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