hadoop windows（工作正常）linux java堆空间

Hi everyone Here is my problem: First of all I'm working with hadoop and a single node configuration I'm developing an application and I made just one map function, in this map function I call like 10 functions, the application reads from a csv file and process a certain column, I already made the jar file and everything so when I run this app with a csv with 4000 rows on windows (windows 7) (using cygwin) on a 4 GB RAM machine, the application works fine, but when I run it on linux- ubuntu on a 2 GB RAM machine, it process some rows but then it throws a "Java heap space" error, or sometimes the thread is killed.Hi everyone Here is my problem: First of all I'