Bug 1296399 - Stale stat information for corrupted objects (replicated volume)
Stale stat information for corrupted objects (replicated volume)
Product: GlusterFS
Classification: Community
Component: bitrot (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Venky Shankar
Depends On:
Blocks: 1297213 1297284 1297300
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Reported: 2016-01-07 02:20 EST by Venky Shankar
Modified: 2016-06-16 09:53 EDT (History)
2 users (show)

See Also:
Fixed In Version: glusterfs-3.8rc2
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 1297213 1297300 (view as bug list)
Last Closed: 2016-06-16 09:53:44 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Venky Shankar 2016-01-07 02:20:19 EST
Description of problem:
Stale stat information returned when an object is corrupted on a replicated volume.

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

How reproducible:

Steps to Reproduce:
1. Create a replicated volume, enable bitrot, mount, perform I/O
2. Wait for files to get signed
3. Corrupt an object (modify form brick directly) from one of the replica (preferably first replica)
4. Wait till scrubber marks the object as corrupted
5. Perform I/O on the file again
6. stat to check object size

Actual results:
Stale (+ incorrect) stat information (size, mtime, etc..) reported

Expected results:
Correct stat information (updated size, mtim, etc..) should be returned

Additional info:
Comment 1 Vijay Bellur 2016-01-07 02:22:37 EST
REVIEW: http://review.gluster.org/13120 (features/bitrot: add check for corrupted object in f{stat}) posted (#3) for review on master by Venky Shankar (vshankar@redhat.com)
Comment 2 Vijay Bellur 2016-01-10 07:43:33 EST
COMMIT: http://review.gluster.org/13120 committed in master by Venky Shankar (vshankar@redhat.com) 
commit d5d6918ce7dc9f54496da435af546611dfbe7d5c
Author: Venky Shankar <vshankar@redhat.com>
Date:   Wed Dec 30 14:56:12 2015 +0530

    features/bitrot: add check for corrupted object in f{stat}
    Check for corrupted objects is done bt bitrot stub component
    for data operations and such fops are denied processing by
    returning EIO. These checks were not done for operations such
    as get/set extended attribute, stat and the likes - IOW, stub
    only blocked pure data operations.
    However, its necessary to have these checks for certain other
    fops, most importantly stat (and fstat). This is due to the
    fact that clients could possibly get stale stat information
    (such as size, {a,c,m}time) resulting in incorrect operation
    of the application that rely on these fields. Note that, the
    data that replication would take care of fetching good (and
    correct) data, but the staleness of stat information could
    lead to data inconsistencies (e.g., rebalance, tier).
    Change-Id: I5a22780373b182a13f8d2c4ca6b7d9aa0ffbfca3
    BUG: 1296399
    Signed-off-by: Venky Shankar <vshankar@redhat.com>
    Reviewed-on: http://review.gluster.org/13120
    Reviewed-by: Kotresh HR <khiremat@redhat.com>
    Reviewed-by: mohammed rafi  kc <rkavunga@redhat.com>
    Reviewed-by: Raghavendra Bhat <raghavendra@redhat.com>
    Tested-by: NetBSD Build System <jenkins@build.gluster.org>
    Tested-by: Gluster Build System <jenkins@build.gluster.com>
Comment 3 Niels de Vos 2016-06-16 09:53:44 EDT
This bug is getting closed because a release has been made available that should address the reported issue. In case the problem is still not fixed with glusterfs-3.8.0, please open a new bug report.

glusterfs-3.8.0 has been announced on the Gluster mailinglists [1], packages for several distributions should become available in the near future. Keep an eye on the Gluster Users mailinglist [2] and the update infrastructure for your distribution.

[1] http://blog.gluster.org/2016/06/glusterfs-3-8-released/
[2] http://thread.gmane.org/gmane.comp.file-systems.gluster.user

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