[jira] [Commented] (CURATOR-229) No retry on DNS lookup failure

["Michael Putters (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CURATOR-229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14611829#comment-14611829 ] 

Michael Putters commented on CURATOR-229:
-----------------------------------------

The stacktrace:

{code}
ERROR o.a.c.f.imps.CuratorFrameworkImpl - Background exception was not retry-able or retry gave up
java.net.UnknownHostException: host.name.here
  at java.net.InetAddress.getAllByName0(InetAddress.java:1250) ~[na:1.7.0_67]
  at java.net.InetAddress.getAllByName(InetAddress.java:1162) ~[na:1.7.0_67]
  at java.net.InetAddress.getAllByName(InetAddress.java:1098) ~[na:1.7.0_67]
  at org.apache.zookeeper.client.StaticHostProvider.<init>(StaticHostProvider.java:61) ~[zookeeper-3.4.6.jar:3.4.6-1569965]
  at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:445) ~[zookeeper-3.4.6.jar:3.4.6-1569965]
  at org.apache.curator.utils.DefaultZookeeperFactory.newZooKeeper(DefaultZookeeperFactory.java:29) ~[curator-client-2.7.0.jar:na]
  at org.apache.curator.framework.imps.CuratorFrameworkImpl$2.newZooKeeper(CuratorFrameworkImpl.java:160) ~[curator-framework-2.7.0.jar:na]
  at org.apache.curator.HandleHolder$1.getZooKeeper(HandleHolder.java:94) ~[curator-client-2.7.0.jar:na]
  at org.apache.curator.HandleHolder.getZooKeeper(HandleHolder.java:55) ~[curator-client-2.7.0.jar:na]
  at org.apache.curator.ConnectionState.reset(ConnectionState.java:218) ~[curator-client-2.7.0.jar:na]
  at org.apache.curator.ConnectionState.checkTimeouts(ConnectionState.java:193) ~[curator-client-2.7.0.jar:na]
  at org.apache.curator.ConnectionState.getZooKeeper(ConnectionState.java:87) ~[curator-client-2.7.0.jar:na]
  at org.apache.curator.CuratorZookeeperClient.getZooKeeper(CuratorZookeeperClient.java:115) ~[curator-client-2.7.0.jar:na]
  at org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(CuratorFrameworkImpl.java:816) [curator-framework-2.7.0.jar:na]
  at org.apache.curator.framework.imps.CuratorFrameworkImpl.backgroundOperationsLoop(CuratorFrameworkImpl.java:802) [curator-framework-2.7.0.jar:na]
  at org.apache.curator.framework.imps.CuratorFrameworkImpl.access$400(CuratorFrameworkImpl.java:61) [curator-framework-2.7.0.jar:na]
  at org.apache.curator.framework.imps.CuratorFrameworkImpl$4.call(CuratorFrameworkImpl.java:272) [curator-framework-2.7.0.jar:na]
  at java.util.concurrent.FutureTask.run(FutureTask.java:262) [na:1.7.0_67]
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_67]
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_67]
  at java.lang.Thread.run(Thread.java:745) [na:1.7.0_67]
{code}

> No retry on DNS lookup failure
> ------------------------------
>
>                 Key: CURATOR-229
>                 URL: https://issues.apache.org/jira/browse/CURATOR-229
>             Project: Apache Curator
>          Issue Type: Bug
>          Components: Framework
>    Affects Versions: 2.7.0
>            Reporter: Michael Putters
>
> Our environment is setup so that host names (rather than IP addresses) are used when registering services.
> When disconnecting a node from the network, it will attempt to reconnect and - in order to do this - attempts to resolve a host name, which fails (since we have no network connectivity and a DNS server is used).
> It appears this type of exception is no retryable, and the node simply gives up and never reconnects, even when the network connectivity is back.
> Is this the expected behavior? Is there any way to configure Curator so that this type of exception is retryable? I had a look at {{CuratorFrameworkImpl.java}} around line 768 but there doesn't seem to be anything configurable.
> If this is not the expected behavior (or if it is but you don't mind making it configurable), I should be able to provide a patch via a pull request.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)