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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6825) [WINDOWS] Java NIO socket channels does not work with Windows ipv6
Date Wed, 23 Jan 2013 05:48:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13560411#comment-13560411

stack commented on HBASE-6825:

Patch looks fine Enis.

This line is ok in the pom though it us under windows profile?  (We require cygwin building
windows as platform says?  Then this is ok?)

+              <argLine>-enableassertions -Xmx1900m -Djava.security.egd=file:/dev/./urandom
> [WINDOWS] Java NIO socket channels does not work with Windows ipv6
> ------------------------------------------------------------------
>                 Key: HBASE-6825
>                 URL: https://issues.apache.org/jira/browse/HBASE-6825
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 0.94.3, 0.96.0
>         Environment: JDK6 on windows for ipv6. 
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>         Attachments: hbase-6825_v3-0.94.patch, hbase-6825_v3-trunk.patch
> While running the test TestAdmin.testCheckHBaseAvailableClosesConnection(), I noticed
that it takes very long, since it sleeps for 2sec * 500, because of zookeeper retries. 
> The root cause of the problem is that ZK uses Java NIO to create ServerSorcket's from
ServerSocketChannels. Under windows, the ipv4 and ipv6 is implemented independently, and Java
seems that it cannot reuse the same socket channel for both ipv4 and ipv6 sockets. We are
getting "java.net.SocketException: Address family not supported by protocol
> family" exceptions. When, ZK client resolves "localhost", it gets both v4 and
v6 ::1 address, but the socket channel cannot bind to both v4 and v6. 
> The problem is reported as:
> http://bugs.sun.com/view_bug.do?bug_id=6230761
> http://stackoverflow.com/questions/1357091/binding-an-ipv6-server-socket-on-windows
> Although the JDK bug is reported as resolved, I have tested with jdk1.6.0_33 without
any success. Although JDK7 seems to have fixed this problem. In ZK, we can replace the ClientCnxnSocket
implementation from ClientCnxnSocketNIO to a non-NIO one, but I am not sure that would be
the way to go.
> Disabling ipv6 resolution of "localhost" is one other approach. I'll test it to see whether
it will be any good. 

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