[Bugs] [Bug 1205592] New: [glusterd-snapshot] - Quorum must be computed using existing peers

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1205592

            Bug ID: 1205592
           Summary: [glusterd-snapshot] - Quorum must be computed using
                    existing peers
           Product: GlusterFS
           Version: mainline
         Component: glusterd
          Assignee: kparthas at redhat.com
          Reporter: kparthas at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:
Volume-snapshot feature inherits the notion of quorum from the server-side
quorum feature. In this feature, quorum is computed on the set of peers
participating in the ongoing transaction. This is incorrect.

For e.g,
Snapshot create should fail if there are less than 50% (by default) of nodes
are online in a cluster.

Let's take a storage pool made of 5 nodes. We need at least 3 nodes online for
snapshot create command to succeed. But if we computed quorum on the no. of
nodes participating (i.e online at the beginning of the transaction) then we
would violate the pre-requisite for successful completion of snapshot-create.

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


How reproducible:


Steps to Reproduce:
1. Create a volume and start it.
2. Bring a few nodes offline, such that server-quorum* (50% default) is not
met.
3. Take a volume-snapshot using snapshot-create command.


* - Server-quorum need not be configured for snapshot-create to function
properly.

Actual results:
Snapshot create will succeed.

Expected results:
Snapshot create should fail.


Additional info:

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