Tally Tsabary created ZOOKEEPER-1576:
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Summary: Zookeeper cluster - failed to connect to cluster if one
of the provided IPs causes java.net.UnknownHostException
Key: ZOOKEEPER-1576
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1576
Project: ZooKeeper
Issue Type: Bug
Components: server
Affects Versions: 3.4.3
Environment: Three 3.4.3 zookeeper servers in cluster, linux.
Reporter: Tally Tsabary
Using a cluster of three 3.4.3 zookeeper servers.
All the servers are up, but on the client machine, the firewall is blocking one
of the servers.
The following exception is happening, and the client is not connected to any of
the other cluster members.
The exception:Nov 02, 2012 9:54:32 PM
com.netflix.curator.framework.imps.CuratorFrameworkImpl logError
SEVERE: Background exception was not retry-able or retry gave up
java.net.UnknownHostException: scnrmq003.myworkday.com
at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$1.lookupAllHostAddr(Unknown Source)
at java.net.InetAddress.getAddressesFromNameService(Unknown Source)
at java.net.InetAddress.getAllByName0(Unknown Source)
at java.net.InetAddress.getAllByName(Unknown Source)
at java.net.InetAddress.getAllByName(Unknown Source)
at
org.apache.zookeeper.client.StaticHostProvider.<init>(StaticHostProvider.java:60)
at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:440)
at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:375)
The code at the
org.apache.zookeeper.client.StaticHostProvider.<init>(StaticHostProvider.java:60)
is :
public StaticHostProvider(Collection<InetSocketAddress> serverAddresses) throws
UnknownHostException {
for (InetSocketAddress address : serverAddresses) {
InetAddress resolvedAddresses[] = InetAddress.getAllByName(address
.getHostName());
for (InetAddress resolvedAddress : resolvedAddresses) {
this.serverAddresses.add(new InetSocketAddress(resolvedAddress
.getHostAddress(), address.getPort())); }
}
......
The for-loop is not trying to resolve the rest of the servers on the list if
there is an UnknownHostException at the
InetAddress.getAllByName(address.getHostName());
and it fails the client connection creation.
I was expecting the connection will be created for the other members of the
cluster.
Also, InetAddress is a blocking command, and if it takes very long time,
(longer than the defined timeout) - that also should allow us to continue to
try and connect to the other servers on the list.
Assuming this will be fixed, and we will get connection to the current
available servers, I think the zookeeper should continue to retry to connect to
the not-connected server of the cluster, so it will be able to use it later
when it is back.
If one of the servers on the list is not available during the connection
creation, then it should be retried every x time despite the fact that we
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