[jira] [Assigned] (HAWQ-1521) Idle QE Processes Can't Quit After An Interval

["Radar Lei (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HAWQ-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Radar Lei reassigned HAWQ-1521:
-------------------------------

    Assignee: Lin Wen  (was: Radar Lei)

> Idle QE Processes Can't Quit After An Interval
> ----------------------------------------------
>
>                 Key: HAWQ-1521
>                 URL: https://issues.apache.org/jira/browse/HAWQ-1521
>             Project: Apache HAWQ
>          Issue Type: Bug
>            Reporter: Lin Wen
>            Assignee: Lin Wen
>
> After a query is finished, there are some idle QE processes on segments. These QE processes are expected to quit after a time interval, this interval is controlled by a GUC gp_vmem_idle_resource_timeout, the default value is 18 seconds.
> However, this does't act as expected. Idle QE processes on segments always exist there, unless the QD process quit. 
> The reason is in postgres.c, the codes to enable this timer can't get executed. function gangsExist() always return false, since gang related structures are all NULL.
> 	if (IdleSessionGangTimeout > 0 && gangsExist())
> 		if (!enable_sig_alarm( IdleSessionGangTimeout /* ms */, false))
> 			elog(FATAL, "could not set timer for client wait timeout");



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