[jira] [Assigned] (HAWQ-81) Make resource manager to reject resource request when there are too many segments down

["Yi Jin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HAWQ-81?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yi Jin reassigned HAWQ-81:
--------------------------

    Assignee: Yi Jin  (was: Lei Chang)

> Make resource manager to reject resource request when there are too many segments down
> --------------------------------------------------------------------------------------
>
>                 Key: HAWQ-81
>                 URL: https://issues.apache.org/jira/browse/HAWQ-81
>             Project: Apache HAWQ
>          Issue Type: Improvement
>          Components: Resource Manager
>            Reporter: Yi Jin
>            Assignee: Yi Jin
>
> If there are too many physical segments down, the performance of queries maybe seriously impacted, continue processing queires does not make sense sometime. Therefore, new guc hawq_rm_rejectrequest_nseg_limit is introduced, default value 2, minimum value 0. 
> User can configure this value to let resource manager reject resource request immediately when more than hawq_rm_reject_nseg_down_limit segments are down. The expected full cluster size ( size of segments ) is read from file $GPHOME/etc/slaves.



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