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https://issues.apache.org/jira/browse/TEZ-4156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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László Bodor updated TEZ-4156:
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Fix Version/s: (was: 0.10.1)
> Fix Tez to reuse IPC connections
> --------------------------------
>
> Key: TEZ-4156
> URL: https://issues.apache.org/jira/browse/TEZ-4156
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Priority: Major
> Fix For: 0.10.0
>
> Attachments: TEZ-4156.1.patch, TEZ-4156.2.patch, TEZ-4156.3.patch,
> TEZ-4156.4.patch
>
>
> When tracking DAG progress, TezClientUtils ends up creating new remote user.
> Because of this new UGI creation, IPC connections are not reused internally.
> https://github.com/apache/tez/blob/master/tez-api/src/main/java/org/apache/tez/client/TezClientUtils.java#L965
> More info from Hadoop side:
> In hadoop's IPC layer, connectionIds are checked based on
> UserGroupInformation.
> https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java#L1600
> However, UserGroupInformation comparison is based on ==
> https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java#L1789
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