Tim Armstrong resolved IMPALA-5652.
       Resolution: Fixed
    Fix Version/s: Impala 2.10.0

IMPALA-5652: deprecate unlimited process mem_limit

Started cluster locally with:

  start-impala-cluster.py --impalad_args=--mem_limit=-1

Checked that the warning showed up in the logs:
  W0808 17:01:36.528360  6251 exec-env.cc:237] Configured with unlimited 
process memory limit (--mem_limit='-1'). Starting in the next Impala release, a 
process memory limit must always be specified. See IMPALA-5653.

Change-Id: I42509a6a9ed49e3752931c82310dfda841dd97df
Reviewed-on: http://gerrit.cloudera.org:8080/7622
Reviewed-by: Matthew Jacobs <m...@cloudera.com>
Tested-by: Impala Public Jenkins

> Add deprecation warning for "unlimited" process mem_limit
> ---------------------------------------------------------
>                 Key: IMPALA-5652
>                 URL: https://issues.apache.org/jira/browse/IMPALA-5652
>             Project: IMPALA
>          Issue Type: Task
>          Components: Backend
>            Reporter: Tim Armstrong
>            Assignee: Tim Armstrong
>            Priority: Minor
>              Labels: resource-management
>             Fix For: Impala 2.10.0
> We should add a deprecation warning to the --mem_limit help text and print a 
> warning log message that setting it to "unlimited" ('' or -1) will not be 
> supported in future release.

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