deardeng opened a new pull request, #68066:
URL: https://github.com/apache/doris/pull/68066

   Problem Summary: When a BE in a non-normal cloud cluster stays offline, 
every failed heartbeat after the lost-heartbeat threshold submits another 
transaction cleanup task. Each task queries get_prepare_txn_by_coordinator, 
which scans the instance transaction metadata even after cleanup finishes. 
Restrict these submissions to lost-heartbeat durations in [T, 2T), where T is 
abort_txn_after_lost_heartbeat_time_second. Keep the existing behavior for 
NORMAL cloud clusters and non-cloud deployments. This deliberately stops 
further submissions after the window even if earlier cleanup attempts failed.
   
   ### Release note
   
   Limit repeated transaction cleanup task submissions for offline BEs in 
non-normal cloud clusters to a bounded window (5 to 10 minutes after the last 
successful heartbeat with the default configuration).
   
   ### Check List (For Author)
   
   - Test: Add HeartbeatMgrTest coverage for all four non-normal cluster 
states, durations before/inside/after the window, NORMAL and non-cloud 
behavior, replay, and missing successful heartbeats. Tests and local 
compilation were not run as requested. Checkstyle on both changed files and git 
diff --check passed.
   - Behavior changed: Yes, stop submitting BE-down cleanup tasks for 
non-normal cloud clusters once the lost-heartbeat duration reaches twice the 
threshold.
   - Does this need documentation: No
   
   ### What problem does this PR solve?
   
   Issue Number: close #xxx
   
   Related PR: #xxx
   
   Problem Summary:
   
   ### Release note
   
   None
   
   ### Check List (For Author)
   
   - Test <!-- At least one of them must be included. -->
       - [ ] Regression test
       - [x] Unit Test
       - [ ] Manual test (add detailed scripts or steps below)
       - [ ] No need to test or manual test. Explain why:
           - [ ] This is a refactor/code format and no logic has been changed.
           - [ ] Previous test can cover this change.
           - [ ] No code files have been changed.
           - [ ] Other reason <!-- Add your reason?  -->
   
   - Behavior changed:
       - [x] No.
       - [ ] Yes. <!-- Explain the behavior change -->
   
   - Does this need documentation?
       - [x] No.
       - [ ] Yes. <!-- Add document PR link here. eg: 
https://github.com/apache/doris-website/pull/1214 -->
   
   ### Check List (For Reviewer who merge this PR)
   
   - [ ] Confirm the release note
   - [ ] Confirm test cases
   - [ ] Confirm document
   - [ ] Add branch pick label <!-- Add branch pick label that this PR should 
merge into -->
   
   


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