[Bugs] [Bug 1557435] Enable lookup-optimize by default

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1557435



--- Comment #4 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/19797 committed in master by "Raghavendra G"
<rgowdapp at redhat.com> with a commit message- cluster/dht: Update layout in
inode only on success

With lookup-optimize enabled, gf_defrag_settle_hash in rebalance
sometimes flips the on-disk layout on volume root post the
migration of all files in the directory.

This is sometimes seen when attempting to fix the layout of a
directory multiple times before calling gf_defrag_settle_hash.
dht_fix_layout_of_directory generates a new layout in memory but
updates it in the inode ctx before it is set on disk. The layout
may be different the second time around due to
dht_selfheal_layout_maximize_overlap. If the layout is then not
written to the disk, the inode now contains the wrong layout.
gf_defrag_settle_hash does not check the correctness of the layout
in the inode before updating the commit-hash and writing it to the
disk thus changing the layout of the directory.

Change-Id: Ie1407d92982518f2a0c40ec70ad370b34a87b4d4
updates: bz#1557435
Signed-off-by: N Balachandran <nbalacha at redhat.com>

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