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From "Paolo Patierno (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5506) bin/kafka-consumer-groups.sh failing to query offsets
Date Fri, 23 Jun 2017 09:48:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16060646#comment-16060646
] 

Paolo Patierno commented on KAFKA-5506:
---------------------------------------

[~amar_] which Kafka version are you using ? I can't reproduce the problem on the trunk.

> bin/kafka-consumer-groups.sh failing to query offsets
> -----------------------------------------------------
>
>                 Key: KAFKA-5506
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5506
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer
>         Environment: Linux slfd06 4.4.0-78-generic #99~14.04.2-Ubuntu SMP Thu Apr 27
18:49:46 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
>            Reporter: Yousef Amar
>              Labels: features, newbie
>
> When I found that {{bin/kafka-consumer-offset-checker.sh}} was deprecated and didn't
work, I checked the docs and ran the following instead (using new consumer, and coordinator
vs zookeeper):
> {code:java}
> bin/kafka-consumer-groups.sh --new-consumer --bootstrap-server localhost:9092 --describe
--group test
> {code}
> I kept getting a NullPointerException though (line numbers are a bit off because of debug
code):
> {code:java}
> java.lang.NullPointerException
>         at org.apache.kafka.common.utils.Utils.join(Utils.java:399)
>         at org.apache.kafka.common.requests.OffsetFetchRequest$Builder.toString(OffsetFetchRequest.java:77)
>         at java.lang.String.valueOf(String.java:2994)
>         at java.lang.StringBuilder.append(StringBuilder.java:131)
>         at org.apache.kafka.clients.ClientRequest.toString(ClientRequest.java:65)
>         at org.apache.kafka.clients.NetworkClient.doSend(NetworkClient.java:375)
>         at org.apache.kafka.clients.NetworkClient.send(NetworkClient.java:332)
>         at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.trySend(ConsumerNetworkClient.java:409)
>         at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:252)
>         at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:208)
>         at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:199)
>         at kafka.admin.AdminClient$$anon$1.run(AdminClient.scala:61)
>         at java.lang.Thread.run(Thread.java:748)
> Error: Executing consumer group command failed due to The server experienced an unexpected
error when processing the request
> {code}
> I tracked this down to the following. The request builder that is instantiated [here|https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/admin/AdminClient.scala#L198]
has its {{partitions}} set to {{ALL_TOPIC_PARTITIONS}} which is null (v2 or newer to request
all topic partitions). Later, [when sending the request|https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/NetworkClient.java#L375],
it's converted to a string. But {{partitions}} above can only be null when built that way,
so [this|https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/common/requests/OffsetFetchRequest.java#L76]
throws the exception.
> I'm quite new to Kafka, so I'm still not entirely sure if I'm doing something wrong or
if this is indeed a bug. As such, any pointers or advice would be much appreciated.



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