Eron Wright created ZOOKEEPER-2982:
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Summary: Re-try DNS hostname -> IP resolution
Key: ZOOKEEPER-2982
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2982
Project: ZooKeeper
Issue Type: Bug
Components: server
Affects Versions: 3.5.3, 3.5.1, 3.5.0
Reporter: Eron Wright
Fix For: 3.5.4
ZOOKEEPER-1506 fixed a DNS resolution issue in 3.4. Some portions of the fix
haven't yet been ported to 3.5.
To recap the outstanding problem in 3.5, if a given ZK server is started before
all peer addresses are resolvable, that server may cache a negative lookup
result and forever fail to resolve the address. For example, deploying ZK
3.5 to Kubernetes using a StatefulSet plus a Service (headless) may fail
because the DNS records are created lazily.
{code}
2018-02-18 09:11:22,583 [myid:0] - WARN
[QuorumPeer[myid=0](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):Follower@95]
- Exception when following the leader
java.net.UnknownHostException: zk-2.zk.default.svc.cluster.local
at
java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at
org.apache.zookeeper.server.quorum.Learner.sockConnect(Learner.java:227)
at
org.apache.zookeeper.server.quorum.Learner.connectToLeader(Learner.java:256)
at
org.apache.zookeeper.server.quorum.Follower.followLeader(Follower.java:76)
at
org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1133)
{code}
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