xichen01 commented on code in PR #4988:
URL: https://github.com/apache/ozone/pull/4988#discussion_r1411718829


##########
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/block/DeletedBlockLogImpl.java:
##########
@@ -437,15 +350,26 @@ public DatanodeDeletedBlockTransactions getTransactions(
       throws IOException {
     lock.lock();
     try {
+      // Here we can clean up the Datanode timeout command that no longer
+      // reports heartbeats
+      getSCMDeletedBlockTransactionStatusManager().cleanAllTimeoutSCMCommand(

Review Comment:
   @sumitagrawl Thank you for the further Review.
   
   
   Our gap may be in the frequency of `SCMBlockDeletingService` execution, in 
my understanding `SCMBlockDeletingService` is executed every `60s`.
   
   In my understanding 
   - `SCMBlockDeletingService timeout`(`OZONE_BLOCK_DELETING_SERVICE_TIMEOUT`): 
This is a value used to determine if the Service runtime has timed out, and if 
it has, a log is printed
   `SCMBlockDeletingService timeout` is only used to print logs, not involved 
in other judgments.
   ```java
    if (endTime - startTime > serviceTimeoutInNanos) {
      LOG.warn("{} Background task execution took {}ns > {}ns(timeout)", 
serviceName, endTime - startTime > serviceTimeoutInNanos) { {
      serviceName, endTime - startTime, serviceTimeoutInNanos); }
    }
   ```
   
   - The `block.deleting.service.interval` determines the period at which the 
`SCMBlockDeletingService` runs, which defaults to 60s.
   - `scmCommandTimeoutMs` is 300s, which means that after SCM sends a delete 
transaction 5 times, if there is no response from the previously sent 
transaction, it will send a delete again.



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