[Bugs] [Bug 1507747] clean up port map on brick disconnect

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1507747



--- Comment #2 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/18587 committed in release-3.12 by  

------------- glusterd: clean up portmap on brick disconnect

GlusterD's portmap entry for a brick is cleaned up when a PMAP_SIGNOUT event is
initiated by the brick process at the shutdown. But if the brick process
crashes
or gets killed through SIGKILL then this event is not initiated and glusterd
ends up with a stale port. Since GlusterD's portmap traversal happens both
ways,
forward for allocation and backward for registry search, there is a possibility
that glusterd might end up running with a stale port for a brick which
eventually will end up with clients to fail to connect to the bricks.

Solution is to clean up the port entry in case the process is down as
part of the brick disconnect event. Although with this the handling
PMAP_SIGNOUT event becomes redundant in most of the cases, but this is
the safeguard method to avoid glusterd getting into the stale port
issues.

> mainline patch : https://review.gluster.org/#/c/18541/

Change-Id: I04c5be6d11e772ee4de16caf56dbb37d5c944303
BUG: 1507747
Signed-off-by: Atin Mukherjee <amukherj at redhat.com>
(cherry picked from commit 30e0b86aae00430823f2523c6efa3c4ebbf0a478)

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