You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@zookeeper.apache.org by "Michael Han (JIRA)" <ji...@apache.org> on 2017/03/13 16:21:59 UTC
[jira] [Updated] (ZOOKEEPER-2202) Cluster crashes when reconfig
adds an unreachable observer
[ 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.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)