HBASE-8622 Remove ' You are currently running the HMaster without HDFS append support enabled. This may result in data loss. Please see the HBase wiki for details. ' from UI

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1486346 13f79535-47bb-0310-9956-ffa450edef68
Add section on mttr; cite nicolas/devaraj blog and point at hbase-8389 varun comments

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1486358 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8618 Master is providing dead RegionServer ServerName's to the balancer

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1486359 13f79535-47bb-0310-9956-ffa450edef68