On Wed, 19 May 2021 05:56:07 GMT, Alan Bateman <al...@openjdk.org> wrote:
>> The test java/net/Socket/UdpSocket.java has been seen to fail with a
>> BindException, in the testMaxSockets test, on a regular basis on
>> macOS-aarch64 platform. testMaxSockets tests the maximum number of UDP
>> Sockets that may be created as defined by a system property
>> sun.net.maxDatagramSockets. It invokes the Socket constructor
>> Socket(InetAddress host, int port, boolean stream) with stream set to false
>> to create a UDP Socket. This instantiation is a compound operation,
>> consisting of the creation of a socket, the explicit binding of wildcard
>> address and ephemeral port, and a connect to the socket end point specified
>> in the constructor parameters. Analysis has shown that during the test that
>> the OS intermittently allocates the same ephemeral port multiple times
>> during the bind system call, such that two separate sockets end up bound to
>> the same port. Then on the connect invocation a BindException is thrown for
>> the second socket. This has been determined to be a transient condition dur
ing heavy loads and where a significant number of ephemeral ports are being
allocated.
>>
>> As this is deemed an OS issues, and in order to increase test stability, it
>> has been found that for the BindException condition a retry of the Socket
>> creation mitigates the issues and tests the max creation property.
>
> test/jdk/java/net/Socket/UdpSocket.java line 151:
>
>> 149: }
>> 150: }
>> 151: return newUdpSocket;
>
> I added this test in advance of JEP 353 as we didn't have much coverage for
> this deprecated constructor. No objection to the retry if it helps. Is the
> catching of SocketException a left over from testing? I assume the patch can
> be simplified down to:
>
>
> try {
> return new Socket(InetAddress.getLoopbackAddress(), 8000, false);
> } catch (BindException e) {
> System.out.println(...);
> return new Socket(InetAddress.getLoopbackAddress(), 8000, false);
> }
yes, thanks for that ... updated as requested
-------------
PR: https://git.openjdk.java.net/jdk/pull/4103
