Mark Tse created HDFS-7255:
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Summary: Customize Java Heap min/max settings for individual
processes
Key: HDFS-7255
URL: https://issues.apache.org/jira/browse/HDFS-7255
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode, journal-node, namenode
Affects Versions: 2.5.1, 2.4.1
Reporter: Mark Tse
The NameNode and JournalNode (and ZKFC) can all run on the same machine.
However, they get their heap settings from HADOOP_HEAPSIZE/JAVA_HEAP_MAX. There
are scenarios where the NameNode process should have different Java memory
requirements than the JournalNode and ZKFC (e.g. if the machine has 10 GB of
RAM, and I want the NameNode process to have 8 GB max).
HADOOP_(.*)_OPTS variables exist for these processes and can be used to add the
Xms and Xmx tags, but because of how the default for JAVA_HEAP_MAX is set, it
will always add '-Xmx1000m' to the final call to start up the
NameNode/JournalNode/ZKFC process, resulting in two different Java heap
settings (e.g. -Xmx1000m and -Xmx8g is used when starting the NameNode).
Note: HADOOP_HEAPSIZE is deprecated according to [HADOOP-10950]
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