abstractdog commented on code in PR #4899:
URL: https://github.com/apache/hive/pull/4899#discussion_r2324275693


##########
ql/src/java/org/apache/hadoop/hive/ql/exec/tez/TezProcessor.java:
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@@ -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:
   configuring such details seems a configuration overkill to me in the initial 
implementation, let's just agree in reasonable values and set it, what do you 
think?
   my idea about 50-500 was a tradeoff about small initial and then not too 
large final sleep, if you have more reasonable values, I'm open to ideas



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