MAPREDUCE-5533. Fixed MR speculation code to track any TaskAttempts that aren't heart-beating for a while, so that we can aggressively speculate instead of waiting for task-timeout. Contributed by Xuan Gong.
svn merge --ignore-ancestry -c 1529229 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1529230 13f79535-47bb-0310-9956-ffa450edef68
Merge r1529251 from trunk to branch-2 for YARN-1232. Configuration to support multiple RMs (Karthik Kambatla via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1529285 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1529296 FIXES: HADOOP-9225. Cover package org.apache.hadoop.compress.Snappy. Contributed by Vadim Bondarev, Andrey Klochkov and Nathan Roberts


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HDFS-5300. Merge change r1529294 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1529305 13f79535-47bb-0310-9956-ffa450edef68