Bug 1378830

Summary:	Satellite 6 performance issues due to slow query
Product:	Red Hat Satellite	Reporter:	Swapnil Abnave <sabnave>
Component:	Tasks Plugin	Assignee:	Swapnil Abnave <sabnave>
Status:	CLOSED DUPLICATE	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	6.2.0	CC:	bkearney, inecas, sabnave
Target Milestone:	Unspecified
Target Release:	Unused
Hardware:	All
OS:	Linux
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Last Closed:	2016-09-26 20:33:03 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Swapnil Abnave 2016-09-23 10:48:14 UTC

After upgrading from Satellite 6.1 to Satellite 6.2, we experienced severe performance issues in Satellite. We managed to track the problem down to a specific query related to Tasks which seemed to hit a degenerate corner case in postgres that caused the query to run extremely slowly.

We've temporarily corrected the issue by flushing all of the Tasks in Satellite to clear out the Tasks tables.  However, it would probably be a good idea to have the Satellite engineering team look at this issue and see if there is anything they can do to prevent the issue from recurring.  For example, perhaps the query can be rewritten or a new index can be created to avoid hitting this degenerate corner case in postgres?

We happen to have an EnterpriseDB support contract, so we also plan to ask EnterpriseDB to look into this problem.  Specifically, we would like EnterpriseDB to determine whether this degenerate corner case should be considered a bug in postgres.