[HBASE-12309] Customize Java Heap min/max settings for individual processes

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 0.98.5, 0.99.1
• Component/s: master, regionserver, REST
• Labels: heap java master regionserver rest
• Assignee: Unassigned
• Reporter: Mark Tse
• Created: 21/Oct/14 15:23
• Updated: 17/Jun/22 17:48
• Resolved: 17/Jun/22 17:47

Description

The separate processes (master, regionserver, zookeeper, rest, etc.) all run using $JAVA_HEAP_MAX in 'bin/hbase'. However, there may be cases where we want the processes to run with different Java max heap sizes.

In 0.98.5, HBASE_(.*)_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 master/regionserver/rest process, resulting in two different Java heap settings (e.g. -Xmx1000m and -Xmx8g is used when starting the master).

In 0.99.1, this default no longer exists so HBASE_(.*)_OPTS is usable, but it would be nice to have dedicated variables for each process.

This issue also exists in Hadoop HDFS (HDFS-7255).