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https://issues.apache.org/jira/browse/FLINK-5996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17274270#comment-17274270
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Till Rohrmann commented on FLINK-5996:
--------------------------------------
I think this is more of a question for the {{ZooKeeperClient}}. According to
[ZooKeeper's
documentation|https://zookeeper.apache.org/doc/r3.5.1-alpha/zookeeperProgrammers.html],
the client only establishes a connection to a single server.
> Jobmanager HA should not crash on lost ZK node
> ----------------------------------------------
>
> Key: FLINK-5996
> URL: https://issues.apache.org/jira/browse/FLINK-5996
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Coordination
> Affects Versions: 1.2.0
> Reporter: Gyula Fora
> Assignee: Dominik Wosiński
> Priority: Major
>
> Even if there are multiple zk hosts configured the jobmanager crashes if one
> of them is lost:
> org.apache.flink.shaded.org.apache.curator.CuratorConnectionLossException:
> KeeperErrorCode = ConnectionLoss
> at
> org.apache.flink.shaded.org.apache.curator.ConnectionState.checkTimeouts(ConnectionState.java:197)
> at
> org.apache.flink.shaded.org.apache.curator.ConnectionState.getZooKeeper(ConnectionState.java:87)
> at
> org.apache.flink.shaded.org.apache.curator.CuratorZookeeperClient.getZooKeeper(CuratorZookeeperClient.java:115)
> at
> org.apache.flink.shaded.org.apache.curator.framework.imps.CuratorFrameworkImpl.getZooKeeper(CuratorFrameworkImpl.java:477)
> at
> org.apache.flink.shaded.org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:302)
> at
> org.apache.flink.shaded.org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:291)
> at
> org.apache.flink.shaded.org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:107)
> at
> org.apache.flink.shaded.org.apache.curator.framework.imps.GetDataBuilderImpl.pathInForeground(GetDataBuilderImpl.java:288)
> at
> org.apache.flink.shaded.org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:279)
> at
> org.apache.flink.shaded.org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:41)
> at
> org.apache.flink.shaded.org.apache.curator.framework.recipes.shared.SharedValue.readValue(SharedValue.java:244)
> at
> org.apache.flink.shaded.org.apache.curator.framework.recipes.shared.SharedValue.access$100(SharedValue.java:44)
> at
> org.apache.flink.shaded.org.apache.curator.framework.recipes.shared.SharedValue$1.process(SharedValue.java:61)
> at
> org.apache.flink.shaded.org.apache.curator.framework.imps.NamespaceWatcher.process(NamespaceWatcher.java:67)
> at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:522)
> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:498)
> We should have some retry logic there
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