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https://issues.apache.org/jira/browse/TEZ-1261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14055117#comment-14055117
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Rohini Palaniswamy commented on TEZ-1261:
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Problem was there was two ShuffleScheduler instances from different Fetcher
threads. Each got initialized with remainingMaps = 4. They each pulled two and
reduced it to 2 and so were stuck waiting for 2 more.
> ShuffleVertexManager auto parallelism is broken after TEZ-1131
> --------------------------------------------------------------
>
> Key: TEZ-1261
> URL: https://issues.apache.org/jira/browse/TEZ-1261
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Daniel Dai
> Assignee: Bikas Saha
> Fix For: 0.5.0
>
> Attachments: syslog_dag_1404758486092_0018_1,
> syslog_dag_1404809927717_0001_1
>
>
> A plain 3 vertex join hang forever when turn on auto-parallelism. AM log
> attached.
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