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https://issues.apache.org/jira/browse/TEZ-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14950831#comment-14950831
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Hitesh Shah commented on TEZ-2872:
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bq. But that might not be a problem in your case
The re-localization issue holds if the task spec is different for each vertex.
> Tez AM can be overwhelmed by TezTaskUmbilicalProtocol.getTask responses
> -----------------------------------------------------------------------
>
> Key: TEZ-2872
> URL: https://issues.apache.org/jira/browse/TEZ-2872
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Jason Lowe
>
> When a large job runs on a large cluster with a large user payload then the
> AM can end up hitting OOM conditions. For example, Pig-on-Tez can require a
> significant user payload (approaching 1MB) for vertices, inputs, and outputs
> in the DAG. This can cause the ContainerTask response to be rather large per
> task, which can lead to a situation where the AM is generating output faster
> than the network interface can process it. If there are enough containers
> asking for tasks then this leads to an OOM condition.
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