[jboss-jira] [JBoss JIRA] Created: (JGRP-823) TCCPING: "failed creating initial list of hosts" fails stack startup

[P Eger (JIRA)]

TCCPING: "failed creating initial list of hosts" fails stack startup
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                 Key: JGRP-823
                 URL: https://jira.jboss.org/jira/browse/JGRP-823
             Project: JGroups
          Issue Type: Bug
    Affects Versions: 2.6.3
         Environment: RHEL4 x64, Sun JDK 1.5.0_16 64-bit
            Reporter: P Eger
            Assignee: Bela Ban


Using TCPPING is dangerous, as if any of the servers do not have a valid DNS entry the stack will fail with below execption. I would thing a much preferable behaviour in this case would be to silently (or with WARN) ignore those servers that do not name resolve. In the below example, csvr1and csvr2 exist and are online/started, csvr3 is attempting to start and csvr4 is offline/non-existent. csvr3 fails since it cannot DNS resolve csvr4, even though csvr1,csvr2 are avaiable and ready to process. Basically i think that a DNS lookup error should be treated equivalent to a connection failure, possibly by delaying the name resolution until later when the actual connect is attempted.

<TCPPING timeout="15000"
initial_hosts="${jgroups.tcpping.initial_hosts:csvr1[17801],csvr2[17801],csvr3[17801],csvr4[17801]}}"
port_range="1"
num_initial_members="2"/>


ERROR | failed creating initial list of hosts
java.net.UnknownHostException: csvr4: csvr4
        at java.net.InetAddress.getAllByName0(InetAddress.java:1145)
        at java.net.InetAddress.getAllByName(InetAddress.java:1072)
        at java.net.InetAddress.getAllByName(InetAddress.java:1008)
        at java.net.InetAddress.getByName(InetAddress.java:958)
        at org.jgroups.stack.IpAddress.<init>(IpAddress.java:53)
        at org.jgroups.protocols.TCPPING.createInitialHosts(TCPPING.java:147)
        at org.jgroups.protocols.TCPPING.setProperties(TCPPING.java:77)
        at org.jgroups.stack.Protocol.setPropertiesInternal(Protocol.java:97)
        at org.jgroups.stack.Configurator$ProtocolConfiguration.createLayer(Configurator.java:828)
        at org.jgroups.stack.Configurator$ProtocolConfiguration.access$000(Configurator.java:724)
        at org.jgroups.stack.Configurator.createProtocols(Configurator.java:505)
        at org.jgroups.stack.Configurator.setupProtocolStack(Configurator.java:61)
        at org.jgroups.stack.ProtocolStack.setup(ProtocolStack.java:285)
        at org.jgroups.JChannel.init(JChannel.java:1506)
        at org.jgroups.JChannel.<init>(JChannel.java:246)
        at org.jgroups.JChannel.<init>(JChannel.java:184)

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