HBASE-10813 Possible over-catch of exceptions (Ding Yuan)

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1586006 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10931 Enhance logs

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1586019 13f79535-47bb-0310-9956-ffa450edef68