HADOOP-8427. Convert Forrest docs to APT, incremental. (adi2 via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1428945 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1429040 FIXES: MAPREDUCE-4832. MR AM can get in a split brain situation. Contributed by Jason Lowe


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YARN-50. Implement renewal / cancellation of Delegation Tokens(Siddharth Seth via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1429095 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-4894. Renewal / cancellation of JobHistory tokens (Siddharth Seth via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1429097 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1429114 FIXES: MAPREDUCE-4819. AM can rerun job after reporting final job status to the client (bobby and Bikas Saha via bobby)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1429120 13f79535-47bb-0310-9956-ffa450edef68