[Bugs] [Bug 1285660] New: sharding - reads fail on sharded volume while running iozone

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1285660

            Bug ID: 1285660
           Summary: sharding - reads fail on sharded volume while running
                    iozone
           Product: GlusterFS
           Version: mainline
         Component: sharding
          Keywords: Triaged
          Assignee: kdhananj at redhat.com
          Reporter: kdhananj at redhat.com
        QA Contact: bugs at gluster.org
                CC: bugs at gluster.org



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 at 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
Bricks:
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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Expected results:


Additional info:

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