[jira] [Commented] (AMBARI-4206) Significant lag between host status update and slave/master component start/stop

["Sumit Mohanty (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AMBARI-4206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13859933#comment-13859933 ] 

Sumit Mohanty commented on AMBARI-4206:
---------------------------------------

UI checks the host_status from the server at an interval of 6 seconds (host component status are updated simultaneously in the same polling run).
The server updates the host_status on every heartbea (should happen about every 10 seconds).
Here are the result of 10 test runs, measuring the time between the host component status update and host status update.  Note that these are multiples of 6's because UI polls every 6 seconds:

30
12
12
12
12
30
6
0
6
0



> Significant lag between host status update and slave/master component start/stop
> --------------------------------------------------------------------------------
>
>                 Key: AMBARI-4206
>                 URL: https://issues.apache.org/jira/browse/AMBARI-4206
>             Project: Ambari
>          Issue Type: Bug
>          Components: controller
>    Affects Versions: 1.4.3
>            Reporter: Sumit Mohanty
>            Assignee: Sumit Mohanty
>             Fix For: 1.4.3
>
>
> Steps:
> # Go to any host with slave component (DataNode, for example).
> # Click "Stop" options for slave component.
> Result: status marker for slave component start blinking red, but status marker for host behaves strangely: sometimes it also start blinking red immediately/ sometimes changes status to not-blinking red only after slave component stopping will be ended.
> The same for slave component starting.



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