xuekang created YARN-8311:

             Summary: Too many ports are occupied when AM UI is accessed
                 Key: YARN-8311
                 URL: https://issues.apache.org/jira/browse/YARN-8311
             Project: Hadoop YARN
          Issue Type: Bug
          Components: webapp
    Affects Versions: 2.7.2
            Reporter: xuekang

If someone open the AM UI when the app is running, the RM periodically fetch 
the page from AM and return to the user. But  the connection between RM and AM 
is created every time and is not closed instantly. So after some time, lots of 
ports are occupied, especially for long-running services. When another access 
comes, there may be an error: 

2018-05-17 11:33:14,567 INFO org.apache.http.impl.client.DefaultHttpClient: I/O 
exception (java.net.BindException) caught when connecting to the target host: 
Address already in use


Actually, it is the same problem as YARN-1703 , but I don't know why it was 
cancelled by YARN-3217.


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