[jira] [Created] (HADOOP-15130) SocketIOWithTimeout async close idle selector

["zhangshilong (JIRA)" <ji...@apache.org>]

zhangshilong created HADOOP-15130:
-------------------------------------

             Summary: SocketIOWithTimeout async close idle selector
                 Key: HADOOP-15130
                 URL: https://issues.apache.org/jira/browse/HADOOP-15130
             Project: Hadoop Common
          Issue Type: Improvement
          Components: common
            Reporter: zhangshilong
            Priority: Minor


 I start 1000 thread for NM and 1000 thread for AM in fairscheduler pressure test, using Scheduler Load Simulator（SLS） tool.
In jstack log,  I found SocketIOWithTimeout  remove  idle selectors in every select Operation.
That will block 1000+ threads when doing iterator .
{code:java}
        for(Iterator<SelectorInfo> it = pList.queue.iterator(); it.hasNext();) {
          SelectorInfo info = it.next();
          if (info.lastActivityTime > cutoff) {
            break;
          }
          it.remove();
          info.close();
        }
{code}




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