Patch for adding SO_REUSEPORT socket option

[Michael McMahon]

Hi Yingqi,

I think we should consider making it a standard option if there is
a reasonable prospect that all the major platforms will eventually 
support it.
Even if a particular platform does not support it initially (such as 
Windows)
the API allows for this possibility by throwing 
UnsupportedOperationException
on the set and get methods.

The jdk.net API is probably more intended for options that are less 
likely to
be widely supported.

- Michael

On 19/11/15 16:40, Lu, Yingqi wrote:
>
> Hi Michael,
>
> Thank you very much for your email.
>
> The version 1 of the patch is already uploaded at 
> http://cr.openjdk.java.net/~mcberg/jdk/6432031/webrev.01/ 
> <http://cr.openjdk.java.net/%7Emcberg/jdk/6432031/webrev.01/>. The 
> link is also available from 
> https://bugs.openjdk.java.net/browse/JDK-6432031.
>
> We just completed the version 2 which implements the SO_REUSEPORT as 
> an extended socket option (jdk.net.ExtendedSocketOptions) instead of a 
> standard one (Following Alan Bateman’s suggestion). The patch will be 
> uploaded very soon hopefully today. If we have issues uploading it, we 
> will let you know. Once we are done uploading, we will notify this 
> community.
>
> Thanks,
>
> Yingqi Lu (Lucy)
>
> *From:*net-dev [mailto:net-dev-bounces at openjdk.java.net] *On Behalf Of 
> *Michael McMahon
> *Sent:* Thursday, November 19, 2015 6:11 AM
> *To:* Kharbas, Kishor; net-dev at openjdk.java.net
> *Subject:* Re: Patch for adding SO_REUSEPORT socket option
>
> Hi Kishor
>
> Did you mean to include the patch with this message?
> If you send it, I can convert it to a webrev and put
> it on the cr.openjdk server for review
>
> Thanks
> Michael
>
> On 16/11/15 18:49, Kharbas, Kishor wrote:
>
>     Hello all,
>
>     I request the community to review a patch for adding SO_REUSEPORT
>     support. There is already an existing JBS opened at
>     https://bugs.openjdk.java.net/browse/JDK-6432031
>
>     Details :
>
>     SO_REUSEPORT removes 1:1 assignment between listen socket and
>     IP:PORT pair and enable multiple sockets listening to the same
>     address and port. This improves the scalability and parallelism of
>     network traffic handling. It is enabled for both TCP and UDP
>     sockets (at least for Linux). For more details, please refer to
>     https://lwn.net/Articles/542629/. Many applications, especially
>     Linux or BSD based webservers such as Apache httpd and Nginx are
>     already supporting it now. Ruby and Python have it supported as
>     well. Other Java applications such as Netty webserver have it
>     supported via JNI function since JDK has not supported it yet.
>
>     By enabling the SO_REUSEPORT feature itself, up to 4X throughput
>     and latency improvement have been observed from various
>     applications. Specific to Java application with this patch, we
>     modified Apache Hadoop Distributed File System (HDFS) source code
>     to take advantage of this feature. We observed up to 1.93x
>     performance improvements.
>
>     The feature is supported since Linux Kernel 3.9. It is also
>     supported in BSDs, Solaris and Mac OS. Windows does not have it.
>     In the current patch, we only enable the feature on Linux platform
>     since we do not have BSD, Solaris and Mac OS for testing. Whether
>     the feature is supported or not on the running kernel is
>     determined at the run time.
>
>     P.S. Based on Alan Baleman's comment on JBS, we are in meanwhile
>     working on adding this option to 'java.net.ExtendedSocketOption'.
>
>     Regards,
>
>     Kishor Kharbas
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.openjdk.java.net/pipermail/net-dev/attachments/20151119/86f227e2/attachment-0001.html>