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https://issues.apache.org/jira/browse/KAFKA-2154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14559899#comment-14559899
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Jason Gustafson commented on KAFKA-2154:
----------------------------------------
This seems like a duplicate of KAFKA-1867, which has been resolved and is
scheduled for 0.8.3.
> MetadataResponse is Empty on a Fresh Cluster
> --------------------------------------------
>
> Key: KAFKA-2154
> URL: https://issues.apache.org/jira/browse/KAFKA-2154
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.8.1.1
> Reporter: Keith Bourgoin
>
> When I start a fresh cluster using {{bin/kafka-server-start.sh}} and issue a
> MetadataRequest to it, the results are blank. It's correct that there are no
> topics, but there are also no brokers returned. I'm writing a driver for
> Kafka, so this makes the initial connection to the cluster difficult.
> To reproduce:
> * Start Zookeeper with {{bin/zookeeper-server-start.sh
> config/zookeeper.properties}} and a broker with {{bin/kafka-server-start.sh
> config/server.properties}}. Be sure there's nothing in {{/tmp}} from a
> previous run.
> * Run this {{echo -e
> "\x00\x00\x00\x15\x00\x03\x00\x01\x00\x00\x00\x00\x00\x07pykafka\x00\x00\x00\x00"
> | nc localhost 9092 | hd}} and observe the output:
> {noformat}
> 00000000 00 00 00 0c 00 00 00 00 00 00 00 00 00 00 00 00 |................|
> 00000010
> {noformat}
> * Create a topic using {{bin/kafka-topics.sh --zookeeper localhost:2181
> --create --topic test --partitions 2 --replication-factor 1}}
> * Re-run the same command and now observe the output:
> {noformat}
> kfb@parsely-dev:~/src/ct/pykafka$ echo -e
> "\x00\x00\x00\x15\x00\x03\x00\x01\x00\x00\x00\x00\x00\x07pykafka\x00\x00\x00\x00"
> | nc localhost 9092 | hd
> 00000000 00 00 00 61 00 00 00 00 00 00 00 01 00 00 00 00 |...a............|
> 00000010 00 0b 70 61 72 73 65 6c 79 2d 64 65 76 00 00 23 |..parsely-dev..#|
> 00000020 84 00 00 00 01 00 00 00 04 74 65 73 74 00 00 00 |.........test...|
> 00000030 02 00 00 00 00 00 01 00 00 00 00 00 00 00 01 00 |................|
> 00000040 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 |................|
> 00000050 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 |................|
> 00000060 01 00 00 00 00 |.....|
> 00000065
> {noformat}
> In this case, "parsely-dev" is the name of my work VM and the "#" following
> it is the port number. I've verified it's a correctly formatted
> MetadataResponse. It's the first null result that we've having a hard time
> dealing with.
> As for the bytestring, that's a correctly formatted MetadataRequest with no
> topics specified. Presumably if I specified a topic name it would
> auto-create the topic and then start returning broker information. It
> doesn't really change the fact that the initial state is fairly broken.
> Finally, it's worth noting that if I delete the "test" topic (after turning
> on {{delete.topic.enable}}) then the responses still include broker
> information. It's just the initial state which is causing problems.
> {noformat}
> kfb@parsely-dev:~/src/kafka$ bin/kafka-topics.sh --zookeeper localhost:2181
> --delete --topic test
> Topic test is marked for deletion.
> Note: This will have no impact if delete.topic.enable is not set to true.
> kfb@parsely-dev:~/src/ct/pykafka$ echo -e
> "\x00\x00\x00\x15\x00\x03\x00\x01\x00\x00\x00\x00\x00\x07pykafka\x00\x00\x00\x00"
> | nc localhost 9092 | hd
> 00000000 00 00 00 21 00 00 00 00 00 00 00 01 00 00 00 00 |...!............|
> 00000010 00 0b 70 61 72 73 65 6c 79 2d 64 65 76 00 00 23 |..parsely-dev..#|
> 00000020 84 00 00 00 00 |.....|
> 00000025
> {noformat}
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