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From "William Watson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-10924) LocalDistributedCacheManager for concurrent sqoop processes fails to create unique directories
Date Fri, 01 Aug 2014 20:23:41 GMT
William Watson created HADOOP-10924:
---------------------------------------

             Summary: LocalDistributedCacheManager for concurrent sqoop processes fails to
create unique directories
                 Key: HADOOP-10924
                 URL: https://issues.apache.org/jira/browse/HADOOP-10924
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: William Watson


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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