https://community.cloudera.com/t5/Support-Questions/YARN-memory-configuration-parameters-and-Java-Heap-Space/m-p/133025#M95695 <P>Hi again <A rel="user" href="https://community.cloudera.com/users/3902/rbiswas.html" nodeid="3902">@rbiswas</A>,</P><P>Up to my knowledge, each time a mapper (or reducer) is created, the ApplicationMaster will request the NodeManager to allocate a new Container with mapreduce.map.memory.mb (and mapreduce.reduce.memory.mb) MBytes available. So, with my specific configuration, if three mappers are created, then, YARN will try to create three containers with 3072 MB each. Am I right?</P><P>If so, what if YARN can't reserve (3*3072MB)? Will it raise a Java Heap Space Exception?</P><P>Thanks in advance.</P> Tue, 19 Jul 2016 14:53:21 GMT jaimecarodrigue 2016-07-19T14:53:21Z