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https://issues.apache.org/jira/browse/TEZ-1542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14170457#comment-14170457
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Chen He commented on TEZ-1542:
------------------------------
Thank you for the review, [~sseth]. We met this problem when we run two
DAGAppMasters (Concurrent testing two tez jobs that both running in local mode)
in a single JVM. This patch can fix the problem when there are concurrent
EnvironmentUpdateUtils.put() calls.
> Local Mode crashes on concurrentModificationException
> -----------------------------------------------------
>
> Key: TEZ-1542
> URL: https://issues.apache.org/jira/browse/TEZ-1542
> Project: Apache Tez
> Issue Type: Sub-task
> Affects Versions: 0.5.0
> Reporter: Chen He
> Assignee: Chen He
> Attachments: TEZ-1542-2.patch, TEZ-1542-3.patch, TEZ-1542-4.patch,
> TEZ-1542.patch
>
>
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
> at java.util.HashMap$EntryIterator.next(HashMap.java:934)
> at java.util.HashMap$EntryIterator.next(HashMap.java:932)
> at
> java.lang.ProcessEnvironment$StringEntrySet$1.next(ProcessEnvironment.java:332)
> at
> java.lang.ProcessEnvironment$StringEntrySet$1.next(ProcessEnvironment.java:328)
> at
> java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet$1.next(Collections.java:1403)
> at
> java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet$1.next(Collections.java:1396)
> at java.util.HashMap.putAllForCreate(HashMap.java:533)
> at java.util.HashMap.<init>(HashMap.java:320)
> at
> org.apache.tez.dag.utils.EnvironmentUpdateUtils.put(EnvironmentUpdateUtils.java:42)
> at
> org.apache.tez.dag.app.launcher.LocalContainerLauncher.<init>(LocalContainerLauncher.java:112)
> at
> org.apache.tez.dag.app.DAGAppMaster.createContainerLauncher(DAGAppMaster.java:819)
> at
> org.apache.tez.dag.app.DAGAppMaster.serviceInit(DAGAppMaster.java:379)
> at
> org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
> at org.apache.tez.dag.app.DAGAppMaster$5.run(DAGAppMaster.java:1904)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1637)
> at
> org.apache.tez.dag.app.DAGAppMaster.initAndStartAppMaster(DAGAppMaster.java:1901)
> at org.apache.tez.client.LocalClient$1.run(LocalClient.java:294)
> at java.lang.Thread.run(Thread.java:722)
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