https://issues.apache.org/bugzilla/show_bug.cgi?id=45261
Summary: Concurrent node failure leads to inconsistent views.
Product: Tomcat 6
Version: 6.0.16
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Cluster
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Created an attachment (id=22166)
--> (https://issues.apache.org/bugzilla/attachment.cgi?id=22166)
Demonstrate view inconsistency.
In a four node cluster, using NonBlockingCoordinator, if two nodes fail at the
same time, the remaining two nodes get different views and never converge.
When the other nodes restart, they never install a view at all.
I've attached the relevant demo code. Run it on 4 machines, wait for view
installation, then CTRL-C two of them. The other two will never print the same
UniqueId. Start a new node, view is always null.
Immediately after the two node failure, one of the surviving nodes issues this
stack trace;
WARN - Member send is failing for:tcp://{-64, -88, -91, 34}:4000 ; Setting to
su
spect and retrying.
ERROR - Error processing coordination message. Could be fatal.
org.apache.catalina.tribes.ChannelException: Send failed, attempt:2 max:1;
Fault
y members:tcp://{-64, -88, -91, 34}:4000;
at
org.apache.catalina.tribes.transport.nio.ParallelNioSender.doLoop(Par
allelNioSender.java:172)
at
org.apache.catalina.tribes.transport.nio.ParallelNioSender.sendMessag
e(ParallelNioSender.java:78)
at
org.apache.catalina.tribes.transport.nio.PooledParallelSender.sendMes
sage(PooledParallelSender.java:53)
at
org.apache.catalina.tribes.transport.ReplicationTransmitter.sendMessa
ge(ReplicationTransmitter.java:80)
at
org.apache.catalina.tribes.group.ChannelCoordinator.sendMessage(Chann
elCoordinator.java:78)
at
org.apache.catalina.tribes.group.ChannelInterceptorBase.sendMessage(C
hannelInterceptorBase.java:75)
at
org.apache.catalina.tribes.group.interceptors.NonBlockingCoordinator.
handleMyToken(NonBlockingCoordina
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