Bug 1008283 - Corrupted pending_op in pending_op_groups queue
Corrupted pending_op in pending_op_groups queue
Product: OpenShift Online
Classification: Red Hat
Component: Pod (Show other bugs)
Unspecified Unspecified
high Severity high
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Assigned To: Rajat Chopra
libra bugs
Depends On:
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Reported: 2013-09-16 01:15 EDT by Rajat Chopra
Modified: 2015-05-14 20:20 EDT (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2013-10-17 09:28:51 EDT
Type: Bug
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RHEL 7.3 requirements from Atomic Host:
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Description Rajat Chopra 2013-09-16 01:15:04 EDT
Description of problem:

We still see some pending_ops that are corrupted in online deployment. e.g. output of clear-pending-ops says :

ERROR in cleaning up application's op because the type is nil. App uuid - 5217b47b4382ec8f25000223. Op - #<PendingAppOpGroup _id: 52362df6e0b8cd02df000001, _type: nil, created_at: nil, .. <truncated>

Version-Release number of selected component (if applicable):

How reproducible:
Seems to happen time and again with some applications that see lot of REST API volume.

Steps to Reproduce:
1. unknown

Actual results:
pending_op becomes corrupted possibly because of mongoid overwriting at the wrong index.

Expected results:
No pending_op should ever be corrupted.

Additional info:
Last time around the debugging revealed that this happens when 'lock' sanity is violated. Mcoll can sometimes return back after a long time (~15 minutes). If this time happens to be >30 minutes, the lock gets expired exposing the broker thread to write to mongo without a lock.
Comment 1 Rajat Chopra 2013-09-18 00:58:59 EDT
Fixed with rev#ec4f4447e1b65e276f10c2695b9ba799835b7b5b in origin-server.
Atomic updates are now made to embedded documents.

This bug will be difficult to reproduce. We will have to wait for feedback from Online production if this happens again.
Comment 2 Jianwei Hou 2013-09-29 21:44:24 EDT
This bug is not reproduced from QE side in recent days, I'm moving it to verified.

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