Modify the JVM memory allocated when the jar package of Hadoop is run

Modifying parameter Additions in hadoop-env.sh

Export hadoop_heapsize= "4096"

Set the maximum allocated JVM memory to 4096, which is typically used in jar packages to execute additional code in addition to the map and reduce, and the memory footprint required for subsequent code is greater than 1g.

When the map or reduce process prompts for insufficient memory, you can modify the parameters in the Mapred-site.xml file below etc/: MAPREDUCE.MAP.MEMORY.MB value to the appropriate parameters.

Modify the JVM memory allocated when the jar package of Hadoop is run