possible NIO selector leak in 7u25

Bernd Eckenfels bernd-2013 at eckenfels.net
Fri Jul 5 07:05:29 PDT 2013


I have two updates on the Issue:

A) same Problem exists with June 7u40 EA JDK
B) there are no threads starting/terminating in the test 

In our test we run a workload with 1 transaction per second and it 


Am 05.07.2013 um 15:37 schrieb "David M. Lloyd" <david.lloyd at redhat.com>:

> On 7/5/13 2:31 AM, Alan Bateman wrote:
>> On 04/07/2013 21:50, David M. Lloyd wrote:
>>> On 7/4/13 1:53 PM, Alan Bateman wrote:
>>>> On 04/07/2013 19:43, David M. Lloyd wrote:
>>>>> XNIO uses Selectors (usually PollSelectorImpls) which are cached per
>>>>> thread in order to mix blocking and non-blocking I/O.  If you are
>>>>> starting many short-lived threads and doing blocking operations on
>>>>> XNIO channels then this might explain what is happening.  The answer
>>>>> is basically "don't do that".
>>>> When you say "usually PollSelectorImpls" then it normally run with it
>>>> configured to use the poll based Selector?
>>> Yeah it will prefer PollSelectorImpl for temporary selectors, but will
>>> ultimately fall back to whatever the default provider gives.
>> So I guess it must be make direct use of sun.nio.ch? Just curious as I
>> can't see how this would work otherwise.
> Correct, though in a somewhat defensive manner.  It'll still work if that package is missing, just by using the default.
> -- 
> - DML

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