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https://issues.apache.org/jira/browse/IGNITE-21603?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Steshin updated IGNITE-21603:
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Issue Type: Bug (was: Improvement)
> Incorrect backward connection chech with loopback address
> ---------------------------------------------------------
>
> Key: IGNITE-21603
> URL: https://issues.apache.org/jira/browse/IGNITE-21603
> Project: Ignite
> Issue Type: Bug
> Reporter: Vladimir Steshin
> Priority: Major
> Labels: ise
>
> We may skip backward connection check to a previous node if it has the same
> loopback address as the current node.
> Consider:
> # Neither _IgniteConfiguration#setLocalHost()_ or
> _TcpDiscoverySpi#setLocalAddress()_ is set. Or the localhost parameter is set
> to "_0.0.0.0_".
> # Nodes start on different hosts. All the available host addresses are
> resolved and
> # Among the other addresses, all nodes get the loopback address
> "127.0.0.1:47500" (47500 is the default tcp discovery port).
> # Cluster starts and works. But
> # Some node N (A) decides the connection to node N+1 (B) is lost and tries to
> connect to node N+2 (C) and sends _TcpDiscoveryHandshakeRequest_.
> # Before C accepts incoming A's connection, it decides to check B and pings
> it with _ServerImpl#checkConnection(List<InetSocketAddress> addrs, int
> timeout)_
> # Around here, the network is restored, and A can now connect to B anew.
> # "_127.0.0.1:47500_" is last in _List<InetSocketAddress>_ addrs by
> _IgniteUtils#inetAddressesComparator(boolean sameHost)_. But the connect
> attempts in _checkConnection(...)_ are parallel. "_127.0.0.1:47500_" answers
> first.
> # C sees it can connect to "_127.0.0.1:47500_" and chooses it as the alive
> address of B. Other pings to rest of B's addresses are ignored.
> # But "_127.0.0.1:47500_" is one of C's addresses. C realizes it pinged
> itself and decides that B is not reachable:
> {code:java}
> // If local node was able to connect to previous, confirm that it's
> alive.
> ok = liveAddr != null && (!liveAddr.getAddress().isLoopbackAddress()
> || !locNode.socketAddresses().contains(liveAddr));
> {code}
> # C accepts connection from A and answers with
> _TcpDiscoveryHandshakeResponse#previousNodeAlive() == false_
> # But B is ok now. But A connects to C and B is kicked from the ring.
> The problem is that C ping itself by B's address "_127.0.0.1:47500_"
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