Gabriel39 opened a new pull request, #65354:
URL: https://github.com/apache/doris/pull/65354

   ### What problem does this PR solve?
   
   Issue Number: None
   
   Related PR: None
   
   Problem Summary: Paimon JNI scans can create Paimon SDK internal async file 
readers, especially for primary-key merge reads over large ORC files. Doris 
scanner concurrency limits do not directly expose those internal async reader 
threads or Java heap pressure in the query profile. This change adds 
lightweight profile metrics from the Paimon JNI scanner for active scanner 
counts, async reader thread counts, JVM heap/non-heap usage, split and 
predicate diagnostic sizes, async threshold configuration visibility, and 
readBatch/open timing counters.
   
   ### Release note
   
   None
   
   ### Check List (For Author)
   
   - Test: Unit Test
       - JAVA_HOME=/usr/local/opt/openjdk@17/libexec/openjdk.jdk/Contents/Home 
mvn test -pl be-java-extensions/paimon-scanner -am -Dtest=PaimonJniScannerTest 
-DfailIfNoTests=false -Ddoris.thrift.executable=/usr/local/bin/thrift
   - Behavior changed: No
   - 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
       - [ ] 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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