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From "Oleg Kalnichevski (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HTTPASYNC-16) DefaultHttpAsyncClient/AbstractHttpAsyncClient shutdown medthod hangs
Date Sat, 14 Apr 2012 12:55:16 GMT

     [ https://issues.apache.org/jira/browse/HTTPASYNC-16?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Oleg Kalnichevski resolved HTTPASYNC-16.
----------------------------------------

    Resolution: Invalid

It looks like this is not a deadlock in HttpAsyncClient code but rather a synchronization
problem in the application code.

Judging by the tread dump what is likely to be happening is that: AbstractNIOConnPool detects
a timed out connection request and tries to notify the caller by invoking the failed() method
of the future callback. The callback implementation starts a Hibernate transaction which gets
blocked somewhere deep down on the BasicResourcePool class waiting for a resource to become
available. The callback never returns. The pool remains locked.

Oleg

"I/O dispatcher 251" prio=10 tid=0x0000000002097800 nid=0x12e5 in Object.wait() [0x00007f234079c000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00000000e6bbd210> (a com.mchange.v2.resourcepool.BasicResourcePool)
	at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1315)
...
	at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:57)
	at com.laadhari.musicdb.sing365.MyFutureCallBack.failed(MyFutureCallBack.java:208)
...
	at org.apache.http.impl.nio.client.DefaultResultCallback.failed(DefaultResultCallback.java:52)
	at org.apache.http.impl.nio.client.DefaultAsyncRequestDirector.connectionRequestFailed(DefaultAsyncRequestDirector.java:534)
...
	at org.apache.http.concurrent.BasicFuture.failed(BasicFuture.java:122)
...
	at org.apache.http.nio.pool.AbstractNIOConnPool.processPendingRequests(AbstractNIOConnPool.java:244)
...
                
> DefaultHttpAsyncClient/AbstractHttpAsyncClient shutdown medthod hangs
> ---------------------------------------------------------------------
>
>                 Key: HTTPASYNC-16
>                 URL: https://issues.apache.org/jira/browse/HTTPASYNC-16
>             Project: HttpComponents HttpAsyncClient
>          Issue Type: Bug
>    Affects Versions: 4.0-beta2
>         Environment: JAVA 7 linux ubuntu 2.6.32-23
>            Reporter: LAADHARI saber
>         Attachments: ThreadsStack.txt
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> the shutdown methode hangs sometime indefinitely.

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