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The Hortonworks Blog

More from Junping Du

This is the 3rd post in a series that explores the theme of supporting rolling-upgrades & downgrades of a Hadoop YARN cluster. See the introductory post here. Background and Motivation Before HDP 2.2, Hadoop MapReduce applications depended on MapReduce jars being deployed on all the nodes in a cluster. The java classpath of all the […]

This is the third post in a series that explores the theme of supporting rolling-upgrades & downgrades of a Hadoop YARN cluster. See here for an introductory post. Introduction Carrying out a rolling upgrade/downgrade of all nodes in a Hadoop cluster can be a very disruptive process. Before HDP 2.2, if a NodeManager (NM) were […]