[Master] add number of puts in queue per worker

Author: adela

Summary:
added a hashmap which contains for every server the
corresponding number of puts in the queue

Test Plan: not tested

Reviewers: liyintang, vinodv

Reviewed By: vinodv

CC: hbase-eng@, rshroff, manukranthk

Differential Revision: https://phabricator.fb.com/D706889

Task ID: 2099613

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.89-fb@1484157 13f79535-47bb-0310-9956-ffa450edef68
[HBASE-8576] Allow individual classes to get notified when Configuration is reloaded

Author: gauravm

Summary: As a part of online configuration update, we want to allow individual classes to listen for changes in certain configuration properties.

Test Plan: Unit Tests

Reviewers: liyintang, aaiyer, shaneh, rshroff, manukranthk, adela

Reviewed By: liyintang

CC: hbase-eng@

Differential Revision: https://phabricator.fb.com/D812768

Task ID: 2258346

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.89-fb@1484158 13f79535-47bb-0310-9956-ffa450edef68