[jira] [Updated] (TEZ-4236) DAGClientServer is not really needed to be started/used in local mode

["László Bodor (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TEZ-4236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

László Bodor updated TEZ-4236:
------------------------------
    Summary: DAGClientServer is not really needed to be started/used in local mode  (was: Investigate if DAGAppMaster's DAGClientServer is really need to be started/used in local mode)

> DAGClientServer is not really needed to be started/used in local mode
> ---------------------------------------------------------------------
>
>                 Key: TEZ-4236
>                 URL: https://issues.apache.org/jira/browse/TEZ-4236
>             Project: Apache Tez
>          Issue Type: Improvement
>            Reporter: László Bodor
>            Assignee: László Bodor
>            Priority: Major
>         Attachments: TEZ-4236.01.patch, TEZ-4236.02.patch, TEZ-4236.03.patch, TEZ-4236.04.patch, TEZ-4236.05.patch
>
>
> For a customer, we found that they try to run hive on tez local mode tests, and due to strict firewall rules and security policy, the DagClientServer struggles to start or respond to connections (think about corporate laptops here). Instead of investigating the network-related workarounds, let's find another way and decide if DAGAppMaster really needs this server. 
> LocalClient has an embedded [DAGAppMaster|https://github.com/apache/tez/blob/master/tez-dag/src/main/java/org/apache/tez/client/LocalClient.java#L65], so at the first sight, it doesn't make sense to rely on the network environment in terms of AM usage. Hopefully, AM can become more lightweight in the long term if we try to eliminate pointless network usage. 



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