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https://issues.apache.org/jira/browse/HAWQ-47?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lei Chang reassigned HAWQ-47:
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Assignee: Yi Jin (was: Roman Shaposhnik)
> Make user able to set statement level resource usage.
> -----------------------------------------------------
>
> Key: HAWQ-47
> URL: https://issues.apache.org/jira/browse/HAWQ-47
> Project: Apache HAWQ
> Issue Type: New Feature
> Components: Resource Manager
> Reporter: Yi Jin
> Assignee: Yi Jin
> Original Estimate: 120h
> Remaining Estimate: 120h
>
> SET STATEMENT_VSEG_MEM=memory_units
> SET STATEMENT_NVSEG=<integer>
> memory_units ::= 128mb|256mb|512mb|1024mb|1gb|2gb|4gb|8gb|16gb
> Resource manager will try to reserve expected resource for current statement
> execution. The default value of STATEMENT_NVSEG is 0, which means the
> statement level setting is not activated, when STATEMENT_NVSEG is greater
> than zero, STATEMENT_MEM overrides the resource queue virtual segment
> resource quota. Memory core ratio derived by resource queue hierarchy and
> cluster capacity.
> If the expected resource specified by STATEMENT_MEM and STATEMENT_NVSEG can
> not be satisfied due to various reason, the session is timed out.
> Yi Jin <y...@pivotal.io>
> Oct 8 (5 days ago)
> to Lei, Jiali, Amy
> 1) If the expected resource specified by STATEMENT_MEM and STATEMENT_NVSEG
> can not be satisfied due to queue capacity limits, the error is reported at
> once, the session is aborted;
> 2) The setting of statement level resource may cause different query plan
> generated; (Change code for passing this into optimizer??)
> 3) If the expected resource can not be satisfied by the other various
> reasons, the session is timed out.
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