Bug 609534 - Perf: OOME when server is swamped with Calltime data
Perf: OOME when server is swamped with Calltime data
Product: RHQ Project
Classification: Other
Component: Monitoring (Show other bugs)
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low Severity medium (vote)
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Assigned To: RHQ Project Maintainer
Mike Foley
Depends On:
Blocks: rhq-perf
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Reported: 2010-06-30 10:19 EDT by Heiko W. Rupp
Modified: 2014-05-29 17:10 EDT (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2014-05-29 17:10:20 EDT
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
Patch mentioned in the description (1.56 KB, application/octet-stream)
2010-06-30 10:19 EDT, Heiko W. Rupp
no flags Details

  None (edit)
Description Heiko W. Rupp 2010-06-30 10:19:55 EDT
Created attachment 428005 [details]
Patch mentioned in the description

When the server is swamped with call time data (amount depends on JVM size, database etc. ; in my case RHQ server has 384M max heap and I am supplying around 800k-1M values per hour),
a little slowness on the DB (for example) makes CT data pile up and the Server yield an OOME.
Heap dump shows 
- Prepared Statement with 27MB in size
- 3 http threads with 77 MB of data each.

The attached (too simple) patch improves the situation a lot, as smaller chunks of data are sent to the database, so the PS does not get that big.

An improved version of the patch would 
- watch for the size of incoming data and not chop into too small pieces
- chunk the data that goes into alert processing as well
- null out the already processed data after the previous step to help garbage collection
Comment 1 Heiko W. Rupp 2010-06-30 11:25:40 EDT
With the patch I can (with the end_time index present) to 4min intervals, which mean ~ 1.4million values/hour. So I propose including this in the next release.
Comment 2 Heiko W. Rupp 2010-06-30 11:48:32 EDT
Actually it allows to process ~100k values per minute every minute which accounts for 6 million values per hour on a postgres instance on one laptop hard disk and a RHQ server VM with 384 MB of ram.

This is for a 20mins interval now, so no definitive proof, but vm statistics look good.

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