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From László Bodor (Jira) <j...@apache.org>
Subject [jira] [Updated] (TEZ-4236) Investigate if DAGAppMaster's DAGClientServer is really need to be started/used in local mode
Date Thu, 28 Jan 2021 09:28:00 GMT

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

László Bodor updated TEZ-4236:
------------------------------
    Attachment: TEZ-4236.05.patch

> Investigate if DAGAppMaster's DAGClientServer is really need 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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