Bug 1398550
| Summary: | [z-stream clone - 4.0.6] Postgres DB overloads the CPU when specific bookmarks queries are triggered. | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Virtualization Manager | Reporter: | rhev-integ |
| Component: | ovirt-engine | Assignee: | Martin Perina <mperina> |
| Status: | CLOSED ERRATA | QA Contact: | Lucie Leistnerova <lleistne> |
| Severity: | high | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 4.0.3 | CC: | emesika, kshukla, lsurette, mgoldboi, mkalinin, mperina, oourfali, pstehlik, rbalakri, rgolan, Rhev-m-bugs, srevivo, ykaul |
| Target Milestone: | ovirt-4.0.6 | Keywords: | Performance, ZStream |
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | 1390484 | Environment: | |
| Last Closed: | 2017-01-10 17:01:31 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | Infra | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1390484 | ||
| Bug Blocks: | |||
Eli, could you please take a look? This comment was originaly posted by mperina engine with 8 GB memory and 2 CPU audit_log rows 359892 vm_dynamic rows 1417 users rows 2252 Search on fresh engine finishes in 8-10s and after some work and other searches finishes in 14-16s. Next page of search result sometimes goes to 20s. That seems as reasonable time. verified in ovirt-engine-4.0.6.3-0.1.el7ev.noarch this is a big improvement and it makes it bearable. Still > 10s for a query with thousands of records shouldn't take that long. Explain analyze shows huge cost on the Unique function for the distinct because it performs it on *all* the vm fields. I narrowed it down to distinct only on vm name SELECT DISTINCT on (vms.vm_name) ... and the changes in the cost are two orders of magnitude for my machine. Roman,Martin logically distinct on vm_name should be enough can you please look into that. Also we need to make sure we don't have indexes missing cause again I don't see why this needs to run so slow. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2017-0043.html The needinfo request[s] on this closed bug have been removed as they have been unresolved for 1000 days |
Description of problem: When the following bookmark is chosen Events: Users=xxx or vm=yyyy the postgres DB gets overloaded in case of high amount of VMs. Version-Release number of selected component (if applicable): rhv-m 4.0.4.4-0.1.el7ev How reproducible: 100% Steps to Reproduce: 1. Create 100VMs 2. Run the query above Actual results: Postgres consumes 100% of CPU and the query is returned in minutes. Expected results: The records are returned in reasonable time This comment was originaly posted by rhodain