[Bugs] [Bug 1716979] Multiple disconnect events being propagated for the same child

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1716979



--- Comment #1 from Raghavendra G <rgowdapp at redhat.com> ---
Issue was reported upstream by a user via
https://github.com/gluster/glusterfs/issues/648

I'm seeing that if I kill a brick in a replica 3 system, AFR keeps getting
child_down event repeatedly for the same child.

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

How reproducible:
Always.

Steps to Reproduce:
1. Create a replica 3 volume and start it.
2. Put  a break point in __afr_handle_child_down_event() in glustershd process.
3. Kill any one brick.

Actual results:
The break point keeps getting hit once every 3 seconds or so repeatedly.

Expected results:
Only 1 event per one disconnect.

Additional info:
I haven't checked if the same happens for GF_EVENT_CHILD_UP as well. I think
this is regression that needs to be fixed. If this is not a bug please feel
free to close stating why.

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