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From "zhangshilong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-15130) SocketIOWithTimeout async close idle selector
Date Tue, 19 Dec 2017 06:40:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-15130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

zhangshilong updated HADOOP-15130:
----------------------------------
    Description: 
 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 after 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}


  was:
 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}



> 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
>         Attachments: HADOOP-15130.patch
>
>
>  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 after 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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