Benjamin Jaton created ZOOKEEPER-1846:
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Summary: Cached InetSocketAddresses prevent proper dynamic DNS
resolution
Key: ZOOKEEPER-1846
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1846
Project: ZooKeeper
Issue Type: Bug
Components: quorum
Affects Versions: 3.4.5
Reporter: Benjamin Jaton
Priority: Minor
The class QuorumPeer maintains a Map<Long, QuorumServer> quorumPeers.
Each QuorumServer is created with an instance of InetSocketAddress
electionAddr, and holds it forever.
I believe this is why the ZooKeeper servers can't resolve each other
dynamically: If a ZooKeeper in the ensemble cannot be resolved at startup, it
will never be resolved (until restart of the JVM), constantly failing with an
UnknownHostException, even when the node is back up and reachable.
I would suggest to recreate an InetSocketAddress every time we retry the
connection.
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