[Bugs] [Bug 1635979] Writes taking very long time leading to system hogging

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1635979

Worker Ant <bugzilla-bot at gluster.org> changed:

           What    |Removed                     |Added
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             Status|NEW                         |MODIFIED



--- Comment #3 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/21339 committed in release-4.1 by
"Shyamsundar Ranganathan" <srangana at redhat.com> with a commit message-
cluster/afr: Batch writes in same lock even when multiple fds are open

Problem:
When eager-lock is disabled because of multiple-fds opened and app
writes come on conflicting regions, the number of locks grows very
fast leading to all the CPU being spent just in locking and unlocking
by traversing huge queues in locks xlator for granting locks.

Fix:
Reduce the number of locks in transit by bundling the writes in the
same lock and disable delayed piggy-pack when we learn that multiple
fds are open on the file. This will reduce the size of queues in the
locks xlator.  This also reduces the number of network calls like
inodelk/fxattrop.

Please note that this problem can still happen if eager-lock is
disabled as the writes will not be bundled in the same lock.

fixes bz#1635979
Change-Id: I8fd1cf229aed54ce5abd4e6226351a039924dd91
Signed-off-by: Pranith Kumar K <pkarampu at redhat.com>

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