Comment 3 for bug 1432735

Reviewed: https://review.opencontrail.org/8939
Committed: http://github.org/Juniper/contrail-controller/commit/8518e3e4b8f8abfda3c06daafd3078788d828b6c
Submitter: Zuul
Branch: master

commit 8518e3e4b8f8abfda3c06daafd3078788d828b6c
Author: Tapan Karwa <email address hidden>
Date: Mon Apr 6 16:11:47 2015 -0700

Graphwalker optimization

Currently, for each link-delete, the walker does one graph-walk. In the case,
where the server-table code got enough time to process a bunch of, say n,
link-deletes before the walker got a chance to run, the walker will still
perform 'n' graph-walks. The last (n - 1) graph-walks are unnecessary since the
first walk would already work with a graph with all the 'n' links removed.
We fix that by absorbing the last (n - 1) triggers into the first trigger i.e.
run the graph-walk only once instead of 'n' times. Replace the work-queue with
a bitmap of client-ids.

Partial-Bug: 1432735

Change-Id: Iab79a58285aa8a8ebce54e453a1c2215dbe60099