Enis Soztutar created HBASE-6825:
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Summary: [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: 0.96.0, 0.94.3
Environment: JDK6 on windows for ipv6.
Reporter: Enis Soztutar
Assignee: Enis Soztutar
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
127.0.0.1 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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