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https://issues.apache.org/jira/browse/KAFKA-1179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13950899#comment-13950899
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Andrew Olson commented on KAFKA-1179:
-------------------------------------
Using the Java API, calling createMessageStreams(...) multiple times using the
same consumer connector instance appears to cause the consumer to hang in
registerConsumerInZK(...), since a fresh timestamp value is generated for the
consumer subscription. At a minimum, it should be clearly documented that this
is not valid usage of the API.
The following messages are continually logged.
{code}
kafka.utils.ZkUtils$ - I wrote this conflicted ephemeral node
[{"version":1,"subscription":{"topic":1},"pattern":"static","timestamp":"1396019252998"}]
at /consumers/test/ids/test_MAC-AO6517-1396019241689-631e0040 a while back in
a different session, hence I will backoff for this node to be deleted by
Zookeeper and retry
2014-03-28 10:08:39,086 [main] INFO kafka.utils.ZkUtils$ - conflict in
/consumers/test/ids/test_MAC-AO6517-1396019241689-631e0040 data:
{"version":1,"subscription":{"topic":1},"pattern":"static","timestamp":"1396019252998"}
stored data:
{"version":1,"subscription":{"topic":1},"pattern":"static","timestamp":"1396019241812"}
{code}
We're using version 0.8.1.
> createMessageStreams() in javaapi.ZookeeperConsumerConnector does not throw
> ---------------------------------------------------------------------------
>
> Key: KAFKA-1179
> URL: https://issues.apache.org/jira/browse/KAFKA-1179
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Affects Versions: 0.8.0
> Reporter: Vincent Rischmann
> Assignee: Neha Narkhede
>
> In kafka.consumer.javaapi.ZookeeperConsumerConnector.scala, the
> createMessageStreams() directly calls underlying.consume() (line 80)
> In kafka.consumer.ZookeeperConsumerConnector.scala, the
> createMessageStreams() throws an exception if it has been called more than
> once (line 133).
> The javaapi should throw if it is called more than once, just like the scala
> api.
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