https://issues.apache.org/bugzilla/show_bug.cgi?id=47419
Summary: r757582 causes a regression for Tribes ReplicatedMap
Product: Tomcat 6
Version: 6.0.20
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P2
Component: Cluster
AssignedTo: dev@tomcat.apache.org
ReportedBy: rf...@apache.org
I have a simple program to test the function provided by Tomcat tribes:
public static void main(String[] args) throws Exception {
//create a channel
GroupChannel channel = new GroupChannel();
McastService mcastService =
(McastService)channel.getMembershipService();
mcastService.setPort(MULTICAST_PORT);
mcastService.setAddress(MULTICAST_ADDRESS);
InetAddress localhost = InetAddress.getLocalHost();
// REVIEW: In my case, there are multiple IP addresses
// One for the WIFI and the other one for VPN. For some reason the VPN
one doesn't support
// Multicast
// mcastService.setBind("192.168.1.100");
channel.start(Channel.DEFAULT);
org.apache.catalina.tribes.tipis.ReplicatedMap map = new
org.apache.catalina.tribes.tipis.ReplicatedMap(null, channel, 50, "01", null);
map.put(UUID.randomUUID().toString(), localhost.getHostAddress());
for (int i = 0; i < 4; i++) {
Thread.sleep(3000);
System.out.println(localhost + ": " + map.keySet());
}
for (Object e : map.entrySetFull()) {
Map.Entry en = (Map.Entry)e;
org.apache.catalina.tribes.tipis.AbstractReplicatedMap.MapEntry
entry =
(org.apache.catalina.tribes.tipis.AbstractReplicatedMap.MapEntry)en.getValue();
System.out.println(entry);
}
map.breakdown();
channel.stop(Channel.DEFAULT);
}
If I run this programs on the same machine, I expect to see one entry per
process. It works with tribes 6.0.18 but it fails in 6.0.20.
Looking into the changelog, I found the following change is the cause of the
problem.
Revision: 757582
Author: rjung
Date: 4:01:31 PM, Monday, March 23, 2009
Message:
Any cluster node should ignore its own heartbeat messages.
Backport of r755302 ( https://svn.apache.org/viewcvs.cgi?view=rev&rev=755302 ).
----
Modified : /tomcat/tc6.0.x/trunk/STATUS.txt
Modified :
/tomcat/tc6.0.x/trunk/java/org/apache/catalina/tribes/membership/McastServiceImpl.java
Modified : /tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml
socket.setLoopbackMode(true) which disables the loopback. If I change the flag
in debugger to false, then it works as in 6.0.18.
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