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multicast/trusted-interfaces not handled properly at start #9953

dsukhoroslov opened this issue Feb 21, 2017 · 1 comment

multicast/trusted-interfaces not handled properly at start #9953

dsukhoroslov opened this issue Feb 21, 2017 · 1 comment


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@dsukhoroslov dsukhoroslov commented Feb 21, 2017

HZ 3.7.x, 3.8. Suppose I have the following HZ server network config (Spring):

<hz:network port="${bdb.cluster.port:3331}" port-auto-increment="true">
                <hz:multicast enabled="true" multicast-timeout-seconds="10">
		<hz:tcp-ip enabled="false" />
		<hz:aws enabled="false" />

I start two server nodes on my local PC and they connect to each other properly:

2017-02-21 08:57:42.416 [hz.hzInstance.priority-generic-operation.thread-0] INFO  com.hazelcast.internal.cluster.ClusterService - []:3331 [system] [3.8] 

Members [2] {
	Member []:3331 - be781745-37e9-4375-a296-578427bea8a6 this lite
	Member []:3332 - 0d6fc616-a705-4498-8c2c-c5d3c3fb02de lite

If I enable trusted-interfaces section then the nodes cannot connect initially:

2017-02-21 08:52:26.871 [hz.hzInstance.MulticastThread] DEBUG com.hazelcast.internal.cluster.impl.NodeMulticastListener - []:3332 [system] [3.8] JoinMessage from is dropped because its sender is not a trusted interface
2017-02-21 08:52:27.004 [hz.hzInstance.MulticastThread] DEBUG com.hazelcast.internal.cluster.impl.NodeMulticastListener - []:3332 [system] [3.8] Dropped: JoinRequest{packetVersion=4, buildNumber=20170217, memberVersion=3.8.0, address=[]:3332, uuid='c0c583e3-0af3-41e8-804d-b56048ff3607', liteMember=true, credentials=null, memberCount=0, tryCount=5}

But after about 5 minutes the nodes were able to connect:

2017-02-21 08:57:42.418 [hz.hzInstance.priority-generic-operation.thread-0] DEBUG com.hazelcast.internal.cluster.impl.ClusterHeartbeatManager - []:3332 [system] [3.8] MasterConfirmation has been received from Member []:3331 - be781745-37e9-4375-a296-578427bea8a6 lite
2017-02-21 08:57:42.418 [hz.hzInstance.priority-generic-operation.thread-0] DEBUG com.hazelcast.internal.cluster.ClusterService - []:3332 [system] [3.8] Updating members [Member []:3331 - be781745-37e9-4375-a296-578427bea8a6 lite, Member []:3332 - 0d6fc616-a705-4498-8c2c-c5d3c3fb02de this lite]
2017-02-21 08:57:42.419 [hz.hzInstance.priority-generic-operation.thread-0] DEBUG com.hazelcast.internal.partition.InternalPartitionService - []:3332 [system] [3.8] Adding Member []:3331 - be781745-37e9-4375-a296-578427bea8a6 lite
2017-02-21 08:57:42.419 [hz.hzInstance.priority-generic-operation.thread-0] INFO  com.hazelcast.internal.cluster.ClusterService - []:3332 [system] [3.8] 

Members [2] {
	Member []:3331 - be781745-37e9-4375-a296-578427bea8a6 lite
	Member []:3332 - 0d6fc616-a705-4498-8c2c-c5d3c3fb02de this lite

Is it possible to enable this behavior right from the beginning?

Thanks, Denis

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@jerrinot jerrinot commented Feb 21, 2017

Hi @dsukhoroslov,
I think the intended behavior here is to NOT join these 2 members - as your trusted interface does not match the address where members are listening. When you change the trusted-interface element to then your members will join quickly. Also I believe the trusted-interface section does not work with hostnames, it works with IPs only.

Now the question is why your members join eventually. I reckon it's related to split-brain handling, probably it does not check trusted interfaces on receiving a split-brain message.

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