MAPREDUCE-5717. Task pings are interpreted as task progress. Contributed by Jason Lowe


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1559256 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10240. Windows build instructions incorrectly state requirement of protoc 2.4.1 instead of 2.5.0. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1559278 13f79535-47bb-0310-9956-ffa450edef68
Update hadoop-common/CHANGES.txt for HADOOP-10112 in branch2.3

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1559286 13f79535-47bb-0310-9956-ffa450edef68