[Bugs] [Bug 1181588] New: RFE: Rebalance shouldn't start when clients older than glusterfs-3.6 are connected

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1181588

            Bug ID: 1181588
           Summary: RFE: Rebalance shouldn't start when clients older than
                    glusterfs-3.6 are connected
           Product: GlusterFS
           Version: 3.6.1
         Component: glusterd
          Keywords: FutureFeature
          Severity: medium
          Priority: high
          Assignee: bugs at gluster.org
          Reporter: ndevos at redhat.com
                CC: amukherj at redhat.com, bugs at gluster.org,
                    gluster-bugs at redhat.com, kaushal at redhat.com,
                    rgowdapp at redhat.com, vbellur at redhat.com
        Depends On: 1136201
            Blocks: 1163723 (glusterfs-3.6.2)



+++ This bug was initially created as a clone of Bug #1136201 +++
+++                                                           +++
+++ Please use this bug to backport related fixes to 3.6      +++
+++                                                           +++

The DHT xlator has been fixed in glusterfs-3.6 and several data race issues
have been fixed which used to cause data loss during rebalance. With these
changes, glusterfs-3.6 and newer clients can correctly co-operate with the
rebalance process and not cause any data loss. But clients older than
glusterfs-3.6 still have the bugs and could cause data loss when rebalance
happens.

To prevent the above, rebalance on glusterfs-3.6 and above need to start only
if older clients haven't mounted a volume. The gluster cli needs to warn the
user of older clients and fail when attempting a rebalance start. Also, the
user should be able to bypass the check using 'force' if needed.

--- Additional comment from Anand Avati on 2014-09-03 07:55:03 CEST ---

REVIEW: http://review.gluster.org/8583 (glusterd: Prevent rebalance starting
with old clients) posted (#1) for review on master by Kaushal M
(kaushal at redhat.com)

--- Additional comment from Anand Avati on 2014-09-03 11:38:12 CEST ---

COMMIT: http://review.gluster.org/8583 committed in master by Krishnan
Parthasarathi (kparthas at redhat.com) 
------
commit 312b339190b7b8f2e38cdd210bf2ee71e53b287e
Author: Kaushal M <kaushal at redhat.com>
Date:   Wed Sep 3 10:50:31 2014 +0530

    glusterd: Prevent rebalance starting with old clients

    Glusterd will prevent rebalance from starting when clients older than
    glusterfs-v3.6.0 are connected to a volume. This is needed as running
    rebalance with old clients connected could lead to data loss in some
    cases. The DHT xlator on newer clients (>= 3.6.0) has been fixed to
    prevent the data loss issues.

    Change-Id: If58640236382a2fc13f73f6b43777f01713859f7
    BUG: 1136201
    Signed-off-by: Kaushal M <kaushal at redhat.com>
    Reviewed-on: http://review.gluster.org/8583
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Atin Mukherjee <amukherj at redhat.com>
    Reviewed-by: Krishnan Parthasarathi <kparthas at redhat.com>
    Tested-by: Krishnan Parthasarathi <kparthas at redhat.com>

--- Additional comment from Atin Mukherjee on 2014-09-04 11:45:19 CEST ---

Patch has made into codebase.


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1136201
[Bug 1136201] RFE: Rebalance shouldn't start when clients older than
glusterfs-3.6 are connected
https://bugzilla.redhat.com/show_bug.cgi?id=1163723
[Bug 1163723] GlusterFS 3.6.2 tracker
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