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https://issues.apache.org/jira/browse/CASSANDRA-12673?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paulo Motta updated CASSANDRA-12673:
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Status: Ready to Commit (was: Patch Available)
> Nodes cannot see each other in multi-DC, non-EC2 environment with
> two-interface nodes due to outbound node-to-node connection binding to
> private interface
> ----------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-12673
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12673
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Multi-DC, non-EC2 environment with two-interface nodes
> Reporter: Milan Majercik
> Assignee: Milan Majercik
> Priority: Minor
> Fix For: 2.2.x, 3.0.x, 3.x
>
>
> We have a two-DC cluster in non-EC2 environment with each node containing two
> interfaces, one using private addresses for intra-DC communication and the
> other using public addresses for inter-DC communication. After proper
> configuration setup needed for this kind of environment we observed nodes
> cannot see each other.
> The configuration changes made for this purpose are as follows:
> *listen_address*: bound to private interface
> *broadcast_address*: bound to public address
> *listen_on_broadcast_address*: true
> *endpoint_snitch*: GossipingPropertyFileSnitch
> *prefer_local*=true (in cassandra-rackdc.properties)
> Upon restart, cassandra node contacts other nodes with their public addresses
> which is essential for making contacts to foreign data centers. After
> exhaustive investigation we found cassandra binds outbound node-to-node
> connections to private interface (the one specified in listen_address) that
> poses a problem for our environment as these data centers _do not allow
> connections from private interface to public network_.
> A portion of cassandra code responsible for local binding of outbound
> connections can be found in method
> {{org.apache.cassandra.net.OutboundTcpConnectionPool.newSocket}}:
> {code}
> if (!Config.getOutboundBindAny())
> channel.bind(new
> InetSocketAddress(FBUtilities.getLocalAddress(), 0));
> {code}
> After we commented out these two lines and deployed cassandra.jar across the
> cluster, the nodes were able to see each other and everything appears to be
> working fine, including two-DC setup.
> Do you think it's possible to remove these two lines without negative
> consequences? Alternatively, if the local binding serves some specific
> purpose of which I'm ignorant would it be possible to make it configurable?
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