Bug 1285660 - sharding - reads fail on sharded volume while running iozone
sharding - reads fail on sharded volume while running iozone
Product: GlusterFS
Classification: Community
Component: sharding (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Krutika Dhananjay
: Triaged
Depends On:
Blocks: 1285762
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Reported: 2015-11-26 03:18 EST by Krutika Dhananjay
Modified: 2016-06-16 09:47 EDT (History)
1 user (show)

See Also:
Fixed In Version: glusterfs-3.8rc2
Doc Type: Bug Fix
Doc Text:
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Clone Of:
: 1285762 (view as bug list)
Last Closed: 2016-06-16 09:47:06 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
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Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Krutika Dhananjay 2015-11-26 03:18:21 EST
Description of problem:

While running iozone on a distributed-replicated volume with sharding enabled, reads start to fail with EBADFD at some point. The issue is not seen when md-cache is disabled. On loading trace above and below md-cache and rerunning the test, figured shard_fsync_cbk() is not returning the aggregated size of the file to the layers above - this md-cache would cache and serve incorrectly in subsequent operations to the application, leading to failure.

[root@dhcp35-215 ~]# gluster volume info
Volume Name: dis-rep
Type: Distributed-Replicate
Volume ID: e2f66579-06c4-4e88-b825-003211f68d6b
Status: Started
Number of Bricks: 2 x 2 = 4
Transport-type: tcp
Brick1: kdhananjay:/bricks/1
Brick2: kdhananjay:/bricks/2
Brick3: kdhananjay:/bricks/3
Brick4: kdhananjay:/bricks/4
Options Reconfigured:
performance.strict-write-ordering: on
features.shard: on
performance.readdir-ahead: on

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

How reproducible:

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Additional info:
Comment 1 Vijay Bellur 2015-11-26 03:31:51 EST
REVIEW: http://review.gluster.org/12759 (features/shard: Set ctime to 0 in fsync callback) posted (#1) for review on master by Krutika Dhananjay (kdhananj@redhat.com)
Comment 2 Vijay Bellur 2015-11-26 22:58:31 EST
REVIEW: http://review.gluster.org/12759 (features/shard: Set ctime to 0 in fsync callback) posted (#2) for review on master by Krutika Dhananjay (kdhananj@redhat.com)
Comment 3 Vijay Bellur 2015-11-27 03:25:27 EST
COMMIT: http://review.gluster.org/12759 committed in master by Pranith Kumar Karampuri (pkarampu@redhat.com) 
commit 6c95d17dabf979c51905956409560b6bbdae0eb7
Author: Krutika Dhananjay <kdhananj@redhat.com>
Date:   Thu Nov 26 13:59:30 2015 +0530

    features/shard: Set ctime to 0 in fsync callback
    ... to indicate to md-cache that it should not be caching
    file attributes.
    Change-Id: Iaef9bf7fec8008ca47d682b4b15984f26421bcd6
    BUG: 1285660
    Signed-off-by: Krutika Dhananjay <kdhananj@redhat.com>
    Reviewed-on: http://review.gluster.org/12759
    Tested-by: NetBSD Build System <jenkins@build.gluster.org>
    Tested-by: Gluster Build System <jenkins@build.gluster.com>
    Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Comment 4 Niels de Vos 2016-06-16 09:47:06 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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