AlphaGarden opened a new pull request #7312:  [FLINK-11169][runtime] fix the 
problem of not being reloaded for jobmanager's…
URL: https://github.com/apache/flink/pull/7312
 
 
   ## What is the purpose of the change
   
   *In the Flink web UI page, we can access the log of jobmanager from the tab 
under its corresponding page, but we could not reload the log (the content is 
not up-to-date) since the log file has been cached for 300s in the local 
client' disk. And this problem occurs because of the incorrect way to check if 
the file should be cached. *
   
   ## Brief change log
     - *Change the way of checking if the current file is a log file or out 
flie.*
   
   ## Verifying this change
   
     - *git clone https://github.com/AlphaGarden/flink.git*
     - *cd flink*
     - *git checkout hotfix-web-reload-jobmanager-log*
     - *mvn clean package -DskipTests*
     - *run the ./start-cluster.sh script, then the log for jobmanager should 
be reloaded from backend evertime we click the refresh button in Flink Web  UI*
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (no)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (no)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (yes)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
     - Does this pull request introduce a new feature? (no)

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