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https://issues.apache.org/jira/browse/MAPREDUCE-6527?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Haibo Chen reassigned MAPREDUCE-6527:
-------------------------------------
Assignee: Haibo Chen
> Data race on field org.apache.hadoop.mapred.JobConf.credentials
> ---------------------------------------------------------------
>
> Key: MAPREDUCE-6527
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6527
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.7.1
> Reporter: Ali Kheradmand
> Assignee: Haibo Chen
>
> I am running the test suite against a dynamic race detector called
> RV-Predict. Here is a race report that I got:
> {noformat}
> Data race on field org.apache.hadoop.mapred.JobConf.credentials: {{{
> Concurrent read in thread T327 (locks held: {})
> ----> at org.apache.hadoop.mapred.JobConf.getCredentials(JobConf.java:505)
> at
> org.apache.hadoop.mapreduce.task.JobContextImpl.<init>(JobContextImpl.java:70)
> at
> org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:524)
> T327 is created by T22
> at
> org.apache.hadoop.mapred.LocalJobRunner$Job.<init>(LocalJobRunner.java:218)
> Concurrent write in thread T22 (locks held: {Monitor@496c673a,
> Monitor@496319b0})
> ----> at org.apache.hadoop.mapred.JobConf.setCredentials(JobConf.java:510)
> at
> org.apache.hadoop.mapred.LocalJobRunner.submitJob(LocalJobRunner.java:787)
> at
> org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:241)
> at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1290)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1669)
> at org.apache.hadoop.mapreduce.Job.submit(Job.java:1287)
> at
> org.apache.hadoop.mapreduce.lib.jobcontrol.ControlledJob.submit(ControlledJob.java:335)
> locked Monitor@496319b0 at
> org.apache.hadoop.mapreduce.lib.jobcontrol.ControlledJob.submit(ControlledJob.java:n/a)
>
> at
> org.apache.hadoop.mapreduce.lib.jobcontrol.JobControl.run(JobControl.java:245)
> locked Monitor@496c673a at
> org.apache.hadoop.mapreduce.lib.jobcontrol.JobControl.run(JobControl.java:229)
>
> T22 is created by T1
> at
> org.apache.hadoop.mapred.jobcontrol.TestJobControl.doJobControlTest(TestJobControl.java:111)
> }}}
> {noformat}
> In the source code of org.apache.hadoop.mapreduce.JobStatus.submitJob
> function, we have the following lines:
> {code}
> Job job = new Job(JobID.downgrade(jobid), jobSubmitDir);
> job.job.setCredentials(credentials);
> {code}
> It looks a bit suspicious: Job extends thread and at the end of its
> constructor it starts a new thread which creates a new instance of
> JobContextImpl which reads credentials. However, the first thread
> concurrently sets credentials after a creating the Job instance.
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