Hi ChrisIn macOS test server, when configuring the mcastBindAddress as
192.168.1.139 and address as 228.0.0.4 , the code does not use mcastBindAddress
, instead it uses multicast address for socket binding and throws exception
when sending the datagram packet. Here is the exception:
Exception in thread "main" org.apache.catalina.tribes.ChannelException:
java.io.IOException: Can't assign requested address (sendto failed); No faulty
members identified.
at
org.apache.catalina.tribes.group.ChannelCoordinator.internalStart(ChannelCoordinator.java:207)
at
org.apache.catalina.tribes.group.ChannelCoordinator.start(ChannelCoordinator.java:111)
at
org.apache.catalina.tribes.group.ChannelInterceptorBase.start(ChannelInterceptorBase.java:165)
at
org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor.start(MessageDispatchInterceptor.java:228)
at
org.apache.catalina.tribes.group.ChannelInterceptorBase.start(ChannelInterceptorBase.java:165)
at
org.apache.catalina.tribes.group.GroupChannel.start(GroupChannel.java:483)
at test.MemberShipTest.main(MemberShipTest.java:44)
Caused by: java.io.IOException: Can't assign requested address (sendto failed)
at java.net.PlainDatagramSocketImpl.send(Native Method)
at java.net.DatagramSocket.send(DatagramSocket.java:693)
at
org.apache.catalina.tribes.membership.McastServiceImpl.send(McastServiceImpl.java:505)
at
org.apache.catalina.tribes.membership.McastServiceImpl.send(McastServiceImpl.java:482)
at
org.apache.catalina.tribes.membership.McastServiceImpl.start(McastServiceImpl.java:268)
at
org.apache.catalina.tribes.membership.McastService.start(McastService.java:289)
at
org.apache.catalina.tribes.group.ChannelCoordinator.internalStart(ChannelCoordinator.java:196)
... 6 more
When I changed the address to mcastBindAddress while creating the socket, no
more exception occurred.Regards.Gurkan
On Thursday, May 30, 2019, 5:56:46 PM GMT+3, Christopher Schultz
<ch...@christopherschultz.net> wrote:
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Hash: SHA256
Gurkan,
On 5/29/19 02:28, Gurkan Erdogdu wrote:
> Hi In an McastServiceImpl#setupSocket method, if the user
> configures the mcastBindAddress, it will use the socket to bind to
> this address. But, in the code below, it uses the "address" field
> while creating the socket. Is this correct ?
>
> if (mcastBindAddress != null) { try {
> log.info(sm.getString("mcastServiceImpl.bind", address,
> Integer.toString(port))); socket = new MulticastSocket(new
> InetSocketAddress(address,port)); } catch (BindException e) {
That definitely does look weird.
The constructor for McastServiceImpl is even more strange:
/**
* @param bind - the bind address (not sure this is used yet)
* @param mcastAddress - the mcast address
*/
public McastServiceImpl([...],
InetAddress bind,
InetAddress mcastAddress,
[...])
throws IOException {
[...]
this.address = mcastAddress;
this.mcastBindAddress = bind;
[...]
}
There are two items, here:
1. An address to bind to (locally)
2. A multicast target address
The constructor takes these two and calls them:
1. bind
2. mcastAddress
But the class members are called:
1. mcastBindAddress
2. address
The mcastBindAddress appears to be ignored in all but one place, where
the socket's interface is changed to it at McastServiceImpl.java:223:
220 if (mcastBindAddress != null) {
221 if(log.isInfoEnabled())
222 log.info(sm.getString("mcastServiceImpl.setInterface",
mcastBindAddress));
223 socket.setInterface(mcastBindAddress);
224 } //end if
I don't know enough about multicast to know what is supposed to be
happening, here. AFAIK, mcast is a broadcast mechanism and so there is
no difference between the "target" address and the "bind" address: you
just throw packets at the interface:port and that's that.
The code could probably use some clean-up, or at least some better
in-code documentation by someone who has a good understanding of the
whole situation.
- -chris
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