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Date: Tue, 6 Mar 2012 03:49:10 +0000 (UTC)
From: "Thomas Dudziak (Created) (JIRA)" <jira@apache.org>
To: kafka-dev@incubator.apache.org
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Subject: [jira] [Created] (KAFKA-294) "Path length must be > 0" error during
 startup
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"Path length must be > 0" error during startup
----------------------------------------------

                 Key: KAFKA-294
                 URL: https://issues.apache.org/jira/browse/KAFKA-294
             Project: Kafka
          Issue Type: Bug
            Reporter: Thomas Dudziak


When starting Kafka 0.7.0 using zkclient-0.1.jar, I get this error:

{noformat}
INFO 2012-03-06 02:39:04,072  main kafka.server.KafkaZooKeeper Registering broker /brokers/ids/1
FATAL 2012-03-06 02:39:04,111  main kafka.server.KafkaServer Fatal error during startup.
java.lang.IllegalArgumentException: Path length must be > 0
        at org.apache.zookeeper.common.PathUtils.validatePath(PathUtils.java:48)
        at org.apache.zookeeper.common.PathUtils.validatePath(PathUtils.java:35)
        at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:620)
        at org.I0Itec.zkclient.ZkConnection.create(ZkConnection.java:87)
        at org.I0Itec.zkclient.ZkClient$1.call(ZkClient.java:308)
        at org.I0Itec.zkclient.ZkClient$1.call(ZkClient.java:304)
        at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675)
        at org.I0Itec.zkclient.ZkClient.create(ZkClient.java:304)
        at org.I0Itec.zkclient.ZkClient.createPersistent(ZkClient.java:213)
        at org.I0Itec.zkclient.ZkClient.createPersistent(ZkClient.java:223)
        at org.I0Itec.zkclient.ZkClient.createPersistent(ZkClient.java:223)
        at kafka.utils.ZkUtils$.createParentPath(ZkUtils.scala:48)
        at kafka.utils.ZkUtils$.createEphemeralPath(ZkUtils.scala:60)
        at kafka.utils.ZkUtils$.createEphemeralPathExpectConflict(ZkUtils.scala:72)
        at kafka.server.KafkaZooKeeper.registerBrokerInZk(KafkaZooKeeper.scala:57)
        at kafka.log.LogManager.startup(LogManager.scala:124)
        at kafka.server.KafkaServer.startup(KafkaServer.scala:80)
        at kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:47)
        at kafka.Kafka$.main(Kafka.scala:60)
        at kafka.Kafka.main(Kafka.scala)
{noformat}

The problem seems to be this code in {{ZkClient}}'s {{createPersistent}} method:

{code:java}
String parentDir = path.substring(0, path.lastIndexOf('/'));
createPersistent(parentDir, createParents);
createPersistent(path, createParents);
{code}
which doesn't check for whether {{parentDir}} is an empty string, which it will become for {{/brokers/ids/1}} after two recursions.


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