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https://issues.apache.org/jira/browse/ZOOKEEPER-2202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14570057#comment-14570057
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Alexander Shraer commented on ZOOKEEPER-2202:
---------------------------------------------
btw, would this not happen if you initially added the same observer to your
config ? I mean without reconfig. It just seems that this code runs in both
cases.
> Cluster crashes when reconfig adds an unreachable observer
> ----------------------------------------------------------
>
> Key: ZOOKEEPER-2202
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2202
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.5.0, 3.6.0
> Reporter: Raul Gutierrez Segales
> Fix For: 3.5.1, 3.6.0
>
>
> While adding support for reconfig() in Kazoo
> (https://github.com/python-zk/kazoo/pull/333) I found that the cluster can be
> crashed if you add an observer whose election port isn't reachable (i.e.:
> packets for that destination are dropped, not rejected). This will raise a
> SocketTimeoutException which will bring down the PrepRequestProcessor:
> {code}
> 2015-06-02 14:37:16,473 [myid:3] - WARN [ProcessThread(sid:3
> cport:-1)::QuorumCnxManager@384] - Cannot open channel to 100 at election
> address /8.8.8.8:38703
> java.net.SocketTimeoutException: connect timed out
> at java.net.PlainSocketImpl.socketConnect(Native Method)
> at
> java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
> at
> java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
> at
> java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
> at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
> at java.net.Socket.connect(Socket.java:589)
> at
> org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:369)
> at
> org.apache.zookeeper.server.quorum.QuorumPeer.connectNewPeers(QuorumPeer.java:1288)
> at
> org.apache.zookeeper.server.quorum.QuorumPeer.setLastSeenQuorumVerifier(QuorumPeer.java:1315)
> at org.apache.zookeeper.server.quorum.Leader.propose(Leader.java:1056)
> at
> org.apache.zookeeper.server.quorum.ProposalRequestProcessor.processRequest(ProposalRequestProcessor.java:78)
> at
> org.apache.zookeeper.server.PrepRequestProcessor.pRequest(PrepRequestProcessor.java:877)
> at
> org.apache.zookeeper.server.PrepRequestProcessor.run(PrepRequestProcessor.java:143)
> {code}
> A simple repro can be obtained by using the code in the referenced pull
> request above and using 8.8.8.8:3888 (for example) instead of a free (but
> closed) port in the loopback.
> I think that adding an Observer (or a Participant) that isn't currently
> reachable is a valid use case (i.e.: you are provisioning the machine and
> it's not currently needed) so I think we could handle this with lower connect
> timeouts, not sure.
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