Apache Spark：java.lang.OutOfMemoryError：Java 堆空间问题

Question

I am facing the java.lang.OutOfMemoryError: Java Heap Space issue when I run the same spark program every 2nd time.

Here is a scenario:

When I do the spark-submit and runs the spark program for the first time, it gives me the correct output & everything is fine. When I execute the same spark-submit one more time, it is throwing java.lang.OutOfMemoryError: Java Heap Space exception.

When it again works?

If I run the same spark-submit after clearing the linux cache by executing - /proc/sys/vm/drop_caches it again runs successfully for one single time.

I tried setting all possible spark configs like memoryOverhead, drive-memory, executor-memory, etc.

Any idea whats happening here? Is this really a problem with spark code, or its happening because of some linux machine setting or the way cluster is configured?

Thanks.

Answer 1

In case of using df.persist() or df.cache() then you should be also using df.unpersist() method and there's also sqlContext.clearCache() which clears all.