Review request 6834246: (ch) AsynchronousSocketChannel#write completes ... (original) (raw)

Alan Bateman Alan.Bateman at Sun.COM
Mon May 4 11:04:59 UTC 2009

6834246: (ch) AsynchronousSocketChannel#write completes with wrong number of bytes written under load (win)

Sherman - this is a Windows specific stability issue with AsynchronousSocketChannel. For cases where I/O operations complete immediately then it is possible that we will initiate another I/O operation on the same connection before the completion notification is delivered. For these cases the notification is simply discarded and the OVERLAPPED structure returned to the cache. This reduces the latency to the completion handler in many cases but is proving unreliable under load on some versions of Windows (something that we need to follow up with Microsoft on). The proposed fix plays it safe by deferring all completion handling to when the notification is received. I'm hoping to push this to b59 (if approved by the release team). The webrev is here: http://cr.openjdk.java.net/~alanb/6834246/webrev.00/

Thanks, Alan.

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