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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-1576) Zookeeper cluster - failed to connect to cluster if one of the provided IPs causes java.net.UnknownHostException
Date Sun, 30 Jul 2017 21:06:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-1576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16106653#comment-16106653
] 

Hadoop QA commented on ZOOKEEPER-1576:
--------------------------------------

+1 overall.  GitHub Pull Request  Build
      

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 3.0.1) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/909//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/909//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/909//console

This message is automatically generated.

> 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: 3.5.0
>         Environment: Three 3.4.3 zookeeper servers in cluster, linux.
>            Reporter: Tally Tsabary
>            Assignee: Edward Ribeiro
>             Fix For: 3.5.0
>
>         Attachments: ZOOKEEPER-1576-3.4.patch, ZOOKEEPER-1576.3.patch, ZOOKEEPER-1576.4.patch,
ZOOKEEPER-1576.5.patch, ZOOKEEPER-1576.patch
>
>
> 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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