deniskuzZ commented on code in PR #4899:
URL: https://github.com/apache/hive/pull/4899#discussion_r2324126394
##########
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:
@zhengchenyu, sleep is light. what about `canCommit()` invocation every 100
msec? @abstractdog was proposing a capped back-off not to sleep too long
````
static final long MAX_SLEEP = 500;
long nextSleep = 50
while (!processorContext.canCommit()) {
nextSleep = backoff(nextSleep);
}
private void backoff(Long nextSleep) {
try {
Thread.sleep(nextSleep);
} catch (InterruptedException e) {
}
if (nextSleep < MAX_SLEEP) {
nextSleep = Math.min(MAX_SLEEP, nextSleep * 2);
}
return nextSleep;
}
````
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