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From "Sumit Mohanty (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMBARI-19720) when restarting HSI, Ambari should not run slider stop and slider destroy (LLAP script already does that)
Date Wed, 25 Jan 2017 23:57:26 GMT

    [ https://issues.apache.org/jira/browse/AMBARI-19720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15838854#comment-15838854
] 

Sumit Mohanty commented on AMBARI-19720:
----------------------------------------

Reference impl from run.sh
{code}
 cat /var/lib/ambari-agent/tmp/llap-slider2017-01-24_21-26-05/run.sh

#!/bin/bash -e

BASEDIR=$(dirname $0)
slider stop llap0
slider destroy llap0 --force || slider destroy llap0
slider install-package --name LLAP --package  $BASEDIR/llap-24Jan2017.zip --replacepkg
slider create llap0 --resources $BASEDIR/resources.json --template $BASEDIR/appConfig.json
--queue llap
{code}

> when restarting HSI, Ambari should not run slider stop and slider destroy (LLAP script
already does that)
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: AMBARI-19720
>                 URL: https://issues.apache.org/jira/browse/AMBARI-19720
>             Project: Ambari
>          Issue Type: Bug
>          Components: stacks
>    Affects Versions: 2.5.0
>            Reporter: Sumit Mohanty
>            Assignee: Sumit Mohanty
>            Priority: Critical
>             Fix For: 2.5.0
>
>
> These commands are pure overhead, because spinning up slider and connecting to things
is slow. On some test cluster it took ~12sec to do 100ms of noop work. 
> LLAP script already runs them and will eventually avoid the overhead by calling Slider
APIs from an existing JVM. However we just noticed when restarting HSI (but not when restarting
LLAP only), Ambari also runs these commands.



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