It might be a memory issue. Try adding .persist(MEMORY_AND_DISK_ONLY) so that
if the RDD can't fit into memory it will persist parts of the RDD into disk.
cm_go.registerTempTable("x")
ko.registerTempTable("y")
joined_df = sqlCtx.sql("select * from x FULL OUTER JOIN y ON field1=field2")
joined_df.persist(StorageLevel.MEMORY_AND_DISK_ONLY)
joined_df.write.save("/user/data/output")
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