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From "Michael Han (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ZOOKEEPER-2202) Cluster crashes when reconfig adds an unreachable observer
Date Mon, 13 Mar 2017 16:21:59 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-2202?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Han updated ZOOKEEPER-2202:
-----------------------------------
    Fix Version/s:     (was: 3.5.3)
                   3.5.4

> 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
>            Assignee: Raul Gutierrez Segales
>             Fix For: 3.5.4, 3.6.0
>
>         Attachments: ZOOKEEPER-2202.patch
>
>
> 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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