[Bugs] [Bug 1212842] New: tar on a glusterfs mount displays "file changed as we read it" even though the file was not changed

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1212842

            Bug ID: 1212842
           Summary: tar on a glusterfs mount displays "file changed as we
                    read it" even though the file was not changed
           Product: GlusterFS
           Version: 3.7.0
         Component: replicate
          Severity: high
          Assignee: bugs at gluster.org
          Reporter: ssampat at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:
-----------------------

tar command on the glusterfs mount point is seen to report the following error
on some files -

tar: ./linux-3.19.4/tools/perf/scripts/perl: file changed as we read it

There were no changes made to files while the tar command was in progress.
Reproducible on 1x2 volume. Unable to reproduce on a pure distribute volume.

See below for volume information -

# gluster v i test

Volume Name: test
Type: Replicate
Volume ID: f844808b-0d2e-40ce-9331-eddfb2b72855
Status: Started
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: vm5-rhsqa13:/rhs/brick5/b1
Brick2: vm6-rhsqa13:/rhs/brick5/b1
Options Reconfigured:
cluster.consistent-metadata: on
features.quota: on
features.uss: enable
client.event-threads: 4
server.event-threads: 5

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

glusterfs-3.7dev-0.965.git2788ddd.el6.x86_64

How reproducible:
------------------

Tried a couple of times, on 6x3 and 1x2 volumes. Successfully reproducible.


Steps to Reproduce:
--------------------

1. Create replicate or distributed-replicate volume and set the option
`cluster.consistent-metadata' to on. Start the volume.
2. Fuse mount the volume.
3. Download linux kernel and untar it on the mount point.
4. Compile the kernel and try to create a tar.

Actual results:
----------------

While the tar command is running, the above described messages are seen for
many files.

Expected results:
------------------

tar is expected to run successfully.

Additional info:

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