zhangbutao commented on code in PR #5562:
URL: https://github.com/apache/hive/pull/5562#discussion_r1858165775


##########
ql/src/java/org/apache/hadoop/hive/ql/exec/mapjoin/MapJoinMemoryExhaustionHandler.java:
##########
@@ -96,7 +96,12 @@ public void checkMemoryStatus(long tableContainerSize, long 
numRows)
         + tableContainerSize + "\tMemory usage:\t" + usedMemory + 
"\tpercentage:\t" + percentageNumberFormat.format(percentage);
     console.printInfo(msg);
     if(percentage > maxMemoryUsage) {
-      throw new MapJoinMemoryExhaustionError(msg);
+      System.gc();

Review Comment:
   I am not sure how to test this code. Do you have some ut or local test to 
show that this code work well?
   
   btw, I think adding a configuration will be good here & Keep the conf 
disabled.



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