zhangstar333 opened a new pull request, #69423:
URL: https://github.com/apache/doris/pull/69423

   ### What problem does this PR solve?
   
   Issue Number: N/A
   
   Problem Summary: Adapt the rolling-restart recovery part of fd7211e while 
retaining master's DNS cache, resolved-IP RPC clients and runtime tasks. SET 
GLOBAL enable_graceful_shutdown propagates through heartbeat field 16 and 
temporarily shortens heartbeat scheduling without overwriting configuration. 
Stream Load transaction and planning RPCs retry transport errors and NOT_MASTER 
with bounded backoff and request-local redirects; only BE-coordinated Stream 
Load skips lost-FE cancellation. Refresh stale DNS and RPC channels on network 
faults and backend restart replay, gate scheduling until connection cleanup 
finishes, preserve exchange RPC statuses and retain effective blacklist 
entries. Actual BE death/epoch cancellation of ordinary queries remains enabled.
   
   Heartbeat field 15 is already changelog_ttl_reference_tso on master and 
cannot carry the original branch's boolean. New result fields are optional and 
use ids matching fd7211e. Checked available 3.1/4.0/4.1 refs and branch-4.2 
definitions. This does not repair the pre-existing field-15 collision between 
the original private change and master.
   
   ### Release note
   
   Operators can enable enable_graceful_shutdown globally before a rolling 
restart and disable it afterwards. Updated FE and BE binaries are required for 
the new heartbeat flag. Transport and NOT_MASTER retries use at most five 
additional attempts; application errors are returned without replay.
   
   ### 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:
       - [ ] No.
       - [ ] Yes. <!-- Explain the behavior change -->
   
   - Does this need documentation?
       - [ ] 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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