zhengchenyu commented on code in PR #4899:
URL: https://github.com/apache/hive/pull/4899#discussion_r2323939452


##########
ql/src/java/org/apache/hadoop/hive/ql/exec/tez/TezProcessor.java:
##########
@@ -293,6 +293,13 @@ protected void initializeAndRunProcessor(Map<String, 
LogicalInput> inputs,
       rproc.run();
 
       perfLogger.perfLogEnd(CLASS_NAME, PerfLogger.TEZ_RUN_PROCESSOR);
+
+      // Try to call canCommit to AM. If there is no other speculative attempt 
execute canCommit, then continue.
+      // If there are other speculative attempt execute canCommit first, then 
wait until the attempt is killed
+      // or the committed task fails.
+      while (!this.processorContext.canCommit()) {

Review Comment:
   It seems that it doesn't matter. If this is the case, I also removed the 
processorContext parameter passing to avoid unnecessary use of the stack.
   However, the large amount of code modified in this PR has nothing to do with 
this PR. I don’t know if this is a good idea?



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