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From "Alex Rankin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CURATOR-345) NPE in EnsembleTracker when starting Curator
Date Wed, 31 Aug 2016 11:44:20 GMT

    [ https://issues.apache.org/jira/browse/CURATOR-345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15452005#comment-15452005
] 

Alex Rankin commented on CURATOR-345:
-------------------------------------

Looks like I found the correct documentation (in the 3.4 documentation):

https://zookeeper.apache.org/doc/trunk/zookeeperReconfig.html#sc_reconfig_clientport

It unfortunately isn't actually listed in the 3.5.1.alpha documentation, but the value is
the old clientPort value. This value apparently shouldn't be used in the zoo.cfg, but it still
can be without issue, so this bug is still valid.

> NPE in EnsembleTracker when starting Curator
> --------------------------------------------
>
>                 Key: CURATOR-345
>                 URL: https://issues.apache.org/jira/browse/CURATOR-345
>             Project: Apache Curator
>          Issue Type: Bug
>          Components: Framework
>    Affects Versions: 3.1.0, 3.2.0
>         Environment: ZooKeeper 3.5.1-alpha
>            Reporter: Alex Rankin
>            Priority: Minor
>
> We're currently getting a NPE when running Curator 3.1.0 and 3.2.0 in our environment.
I don't believe this was occurring before we upgraded to ZooKeeper 3.5.1-alpha and Curator
3.1.0.
> {code}
>  java.lang.NullPointerException
>  	at org.apache.curator.framework.imps.EnsembleTracker.configToConnectionString(EnsembleTracker.java:171)
~[curator-framework-3.2.0.jar:3.2.0]
> 	at org.apache.curator.framework.imps.EnsembleTracker.processConfigData(EnsembleTracker.java:186)
~[curator-framework-3.2.0.jar:3.2.0]
> 	at org.apache.curator.framework.imps.EnsembleTracker.access$300(EnsembleTracker.java:50)
~[curator-framework-3.2.0.jar:3.2.0]
> 	at org.apache.curator.framework.imps.EnsembleTracker$2.processResult(EnsembleTracker.java:144)
~[curator-framework-3.2.0.jar:3.2.0]
> 	at org.apache.curator.framework.imps.CuratorFrameworkImpl.sendToBackgroundCallback(CuratorFrameworkImpl.java:835)
[curator-framework-3.2.0.jar:3.2.0]
> 	at org.apache.curator.framework.imps.CuratorFrameworkImpl.processBackgroundOperation(CuratorFrameworkImpl.java:618)
[curator-framework-3.2.0.jar:3.2.0]
> 	at org.apache.curator.framework.imps.WatcherRemovalFacade.processBackgroundOperation(WatcherRemovalFacade.java:152)
[curator-framework-3.2.0.jar:3.2.0]
> 	at org.apache.curator.framework.imps.GetConfigBuilderImpl$2.processResult(GetConfigBuilderImpl.java:214)
[curator-framework-3.2.0.jar:3.2.0]
> 	at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:587) [zookeeper-3.5.1-alpha.jar:?]
> 	at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:499) [zookeeper-3.5.1-alpha.jar:?]
> {code}
> The problem is that the QuorumServer.clientAddr here is null. This seems to be filled
by parsing the ZooKeeper server properties, which look something like:
> {quote}
> server.1=zoo1:2888:3888
> server.2=zoo2:2888:3888
> server.3=zoo3:2888:3888
> {quote}
> In the QuorumServer constructor, we parse each server line into its respective tasks.
The clientAddr, however, is filled by splitting the line around a semicolon and taking the
second part:
> {code}
> String[] serverClientParts = addressStr.split(";");
> ...
> if(serverClientParts.length == 2) {
>     String[] e = splitWithLeadingHostname(serverClientParts[1]);
>     if(e.length > 2) {
>         throw new ConfigException(addressStr + " does not have the form server_config
or server_config;client_config where server_config is host:port:port or host:port:port:type
and client_config is port or host:port");
>     }
>     String hostname = e.length == 2?e[0]:"0.0.0.0";
>     ...
> }
> {code}
> This suggests that the server string should be followed by a client host/port (or just
port), e.g.:
> {quote}
> server.1=zoo1:2888:3888;2181
> server.2=zoo2:2888:3888;2181
> server.3=zoo3:2888:3888;localhost:2181
> {quote}
> I can't find anything in the ZooKeeper documentation about this though, and it isn't
mandatory in the properties (so shouldn't throw a NPE).
> This occurs every time we start the server, but doesn't affect functionality, hence the
Minor flag. It would be nice to know what exactly is expected here though, so we can get rid
of the exception.



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