Eric Wohlstadter resolved TEZ-3875.
    Resolution: Duplicate

Duplicates TEZ-3892

> Add "reconnect" API to TezClient for HSI HA
> -------------------------------------------
>                 Key: TEZ-3875
>                 URL: https://issues.apache.org/jira/browse/TEZ-3875
>             Project: Apache Tez
>          Issue Type: New Feature
>    Affects Versions: 0.9.next
>            Reporter: Eric Wohlstadter
>            Priority: Major
> For HiveServer2 HA use cases with LLAP, launching a new Tez session (AM) 
> after failover adds non-interactive latency. Additionally, Tez with LLAP does 
> significant work to provision a long-lived session and hold on to necessary 
> resources allocated to it. We don't want to redo that work after failover and 
> potentially be unable to schedule equivalent resources that may be taken by 
> other applications during failover. 
> HS2 uses TezClient for creating sessions. To simplify HS2 failover to an 
> existing Tez AM, add a "reconnect" method to TezClient.
> {code}
> public void reconnect(ApplicationId) { ... }
> {code}
> {{reconnect}} will setup the TezClient context very similar to {{start}} 
> except it parameterizes the {{sessionAppId}} and doesn't launch a new AM.

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