Bug 1461527
Summary: | [RFE] store longer dup op detection information | ||
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Product: | [Red Hat Storage] Red Hat Ceph Storage | Reporter: | Josh Durgin <jdurgin> |
Component: | RADOS | Assignee: | J. Eric Ivancich <ivancich> |
Status: | CLOSED ERRATA | QA Contact: | ceph-qe-bugs <ceph-qe-bugs> |
Severity: | medium | Docs Contact: | Bara Ancincova <bancinco> |
Priority: | unspecified | ||
Version: | 2.2 | CC: | anharris, ceph-eng-bugs, dzafman, hnallurv, ivancich, jdurgin, kchai, mhackett, shmohan, tserlin, uboppana, vakulkar |
Target Milestone: | rc | Keywords: | FutureFeature |
Target Release: | 2.4 | ||
Hardware: | Unspecified | ||
OS: | Unspecified | ||
Whiteboard: | |||
Fixed In Version: | RHEL: ceph-10.2.7-31.el7cp Ubuntu: ceph_10.2.7-32redhat1 | Doc Type: | Enhancement |
Doc Text: |
.A new structure for detecting duplicate operations
Under certain circumstances, it is better to recover by using the backfill process instead of log-based recovery. The most direct way to force backfilling is to reduce the size of the placement group log. This setting, however, undermines the detection of duplicate operations. This update introduces a separate structure to detect duplicate operations beyond the placement group log entries. As a result, duplicate operations are detected as expected.
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Story Points: | --- |
Clone Of: | Environment: | ||
Last Closed: | 2017-09-05 20:49:52 UTC | Type: | Bug |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: | |||
Bug Depends On: | |||
Bug Blocks: | 1479701 |
Description
Josh Durgin
2017-06-14 16:58:47 UTC
This PR should likely go into this BZ as it fixes a bug in the dup ops code: https://github.com/ceph/ceph/pull/16744 At the time of this writing it hasn't been merged upstream yet. Josh, my understanding is that this won't make it in 2.4 unless it's labeled a blocker. I can do more analysis to see it could create problems other than putting items in the dup index when it should not, but do you have a sense? (In reply to Eric Ivancich from comment #5) > Josh, my understanding is that this won't make it in 2.4 unless it's labeled > a blocker. I can do more analysis to see it could create problems other than > putting items in the dup index when it should not, but do you have a sense? It just saves a tiny amount of cpu/memory in the rare case when we don't index anything. It's not necessary to backport the fix. Marking this bug as verified as planned regression testing and bug verfication is done. Verified on 10.2.7-32.el7cp.x86_64 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://access.redhat.com/errata/RHBA-2017:2640 |