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From "Eric Wohlstadter (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TEZ-3892) Tez-AM Daemon-Mode
Date Tue, 30 Jan 2018 21:11:00 GMT
Eric Wohlstadter created TEZ-3892:
-------------------------------------

             Summary: Tez-AM Daemon-Mode
                 Key: TEZ-3892
                 URL: https://issues.apache.org/jira/browse/TEZ-3892
             Project: Apache Tez
          Issue Type: New Feature
            Reporter: Eric Wohlstadter


This is a proposed opt-in feature.

Tez AM already supports long-lived sessions, if desired a AM session can live indefinitely.

However, new clients cannot connect to a long-lived AM session through the standard TezClient
API. 

TezClient API only provides a "start" method to initiate a connection, which always allocates
a new AM from YARN.
 # For interactive BI use-cases, this startup time can be significant.
 # Hive is implementing a HiveServer2 High Availability feature.
 ** When the singleton HS2 master server fails, the HS2 client is quickly redirected to a
pre-warmed HS2 backup. 
 # For the failover to complete quickly end-to-end, a Tez AM must also be pre-warmed and ready
to accept connections.

For more information, see design for: https://issues.apache.org/jira/browse/HIVE-18281.
----
Anticipated changes:
 # A {{reconnect(ApplicationId)}} method is added to TezClient. The functionality is similar
to {{start}}
 ** Code related to launching a new AM from the RM is factored out.
 ** Since {{start}} and {{reconnect}} will share some code, this code is refactored into reusable
helper methods.
 ** A usage example is added to {{org/apache/tez/examples}}
 # It is not a goal of this JIRA to ensure that running Tez DAGs can be recovered by a client
using the {{reconnect}} API. The goal is only for maintaining a pool of warm Tez AMs to skip
RM/container/JVM startup.



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