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https://issues.apache.org/jira/browse/MAPREDUCE-7079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17023063#comment-17023063
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Ahmed Hussein commented on MAPREDUCE-7079:
------------------------------------------
The work around to avoid the entropy problem on linux machines is to pass JVM
option "{{-Djava.security.egd=file:/dev/./urandom}}" to the MRAppMaster and to
the YarnChild processes. This could be achieved by setting the "{{JVM_OPTS}}"
in {{mapred-default.xml}} but this will be invasive solution.
I opted to append the required configurations to the cluster configuration. The
cluster configuration is passed to the Job which in turn passes it to the task
processes.
> JobHistory#ServiceStop implementation is incorrect
> --------------------------------------------------
>
> Key: MAPREDUCE-7079
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7079
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Jason Darrell Lowe
> Assignee: Ahmed Hussein
> Priority: Major
> Attachments: 2020-01-10-MRApp-stack-dump.txt,
> 2020-01-10-org.apache.hadoop.mapred.TestMRIntermediateDataEncryption-version-14.txt,
> MAPREDUCE-7079.001.patch, MAPREDUCE-7079.002.patch,
> MAPREDUCE-7079.003.patch, MAPREDUCE-7079.004.patch, MAPREDUCE-7079.005.patch,
> MAPREDUCE-7079.006.patch, MAPREDUCE-7079.007.patch, MAPREDUCE-7079.008.patch,
> MAPREDUCE-7079.009.patch
>
>
> {{JobHistory.serviceStop}} skips waiting for the thread pool to terminate.
> The problem is due to incorrect while condition that will evaluate to false
> on the iteration of the loop.
> {code:java}
> scheduledExecutor.shutdown();
> boolean interrupted = false;
> long currentTime = System.currentTimeMillis();
> while (!scheduledExecutor.isShutdown()
> && System.currentTimeMillis() > currentTime + 1000l &&
> !interrupted) {
> try {
> Thread.sleep(20);
> } catch (InterruptedException e) {
> interrupted = true;
> }
> }
> {code}
> The expression "{{System.currentTimeMillis() > currentTime + 1000L}}" is
> false because currentTime was just initialized with
> {{System.currentTimeMillis()}}. As a result the the thread won't wait until
> the executor is terminated. Instead, it will force a shutdown immediately.
> *TestMRIntermediateDataEncryption is failing in precommit builds*
> TestMRIntermediateDataEncryption is either timing out or tearing down the JVM
> which causes the unit tests in jobclient to not pass cleanly during precommit
> builds. From sample precommit console output, note the lack of a test results
> line when the test is run:
> {noformat}
> [INFO] Running org.apache.hadoop.mapred.TestSequenceFileInputFormat
> [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 4.976
> s - in org.apache.hadoop.mapred.TestSequenceFileInputFormat
> [INFO] Running org.apache.hadoop.mapred.TestMRIntermediateDataEncryption
> [INFO] Running org.apache.hadoop.mapred.TestSpecialCharactersInOutputPath
> [INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 16.659
> s - in org.apache.hadoop.mapred.TestSpecialCharactersInOutputPath
> [...]
> [INFO]
> ------------------------------------------------------------------------
> [INFO] BUILD FAILURE
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Total time: 02:14 h
> [INFO] Finished at: 2018-04-12T04:27:06+00:00
> [INFO] Final Memory: 24M/594M
> [INFO]
> ------------------------------------------------------------------------
> [WARNING] The requested profile "parallel-tests" could not be activated
> because it does not exist.
> [WARNING] The requested profile "native" could not be activated because it
> does not exist.
> [WARNING] The requested profile "yarn-ui" could not be activated because it
> does not exist.
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-surefire-plugin:2.21.0:test (default-test) on
> project hadoop-mapreduce-client-jobclient: There was a timeout or other error
> in the fork -> [Help 1]
> {noformat}
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