[ 
https://issues.apache.org/jira/browse/KAFKA-3905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15369206#comment-15369206
 ] 

ASF GitHub Bot commented on KAFKA-3905:
---------------------------------------

GitHub user rekhajoshm opened a pull request:

    https://github.com/apache/kafka/pull/1601

    KAFKA-3905; Handle invalid collection of topics, patterns on subscription 
for list of topics, with patterns, and with assignments

    KAFKA-3905: Handling null/empty topics and collections, patterns when 
subscription with list of topics or with patterns, and with assignments.
    
    - Added validity checks for input parameters on subscribe, assign to avoid 
NPE, and provide an argument exception instead
    - Updated behavior for subscription with null collection to be same as when 
subscription with emptyList.i.e., unsubscribes.
    - Added tests on subscription, assign

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/rekhajoshm/kafka KAFKA-3905-1

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/kafka/pull/1601.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1601
    
----
commit c9a66992b1095616f87c5748f210b973ebc7eb01
Author: Rekha Joshi <rekhajo...@gmail.com>
Date:   2016-05-26T17:48:37Z

    Merge pull request #2 from apache/trunk
    
    Apache Kafka trunk pull

commit 8d7fb005cb132440e7768a5b74257d2598642e0f
Author: Rekha Joshi <rekhajo...@gmail.com>
Date:   2016-05-30T21:37:43Z

    Merge pull request #3 from apache/trunk
    
    Apache Kafka trunk pull

commit fbef9a8fb1411282fbadec46955691c3e7ba2578
Author: Rekha Joshi <rekhajo...@gmail.com>
Date:   2016-06-04T23:58:02Z

    Merge pull request #4 from apache/trunk
    
    Apache Kafka trunk pull

commit 172db701bf9affda1304b684921260d1cd36ae9e
Author: Rekha Joshi <rekhajo...@gmail.com>
Date:   2016-06-06T22:10:31Z

    Merge pull request #6 from apache/trunk
    
    Apache Kafka trunk pull

commit 9d18d93745cf2bc9b0ab4bb9b25d9a31196ef918
Author: Rekha Joshi <rekhajo...@gmail.com>
Date:   2016-06-07T19:36:45Z

    Merge pull request #7 from apache/trunk
    
    Apache trunk pull

commit 882faea01f28aef1977f4ced6567833bcf736840
Author: Rekha Joshi <rekhajo...@gmail.com>
Date:   2016-06-13T20:01:43Z

    Merge pull request #8 from confluentinc/trunk
    
    Apache kafka trunk pull

commit 851315d39c0c308d79b9575546822aa932c46a09
Author: Rekha Joshi <rekhajo...@gmail.com>
Date:   2016-06-27T17:34:54Z

    Merge pull request #9 from apache/trunk
    
    Merge Apache kafka trunk

commit 613f07c2b4193302c82a5d6eaa1e53e4b87bfbc1
Author: Rekha Joshi <rekhajo...@gmail.com>
Date:   2016-07-09T17:03:45Z

    Merge pull request #11 from apache/trunk
    
    Merge Apache kafka trunk

commit ff5a583abf22d40d0bf3339a450d28ce336dd4fa
Author: Joshi <rekhajo...@gmail.com>
Date:   2016-07-09T17:21:49Z

    Handle invalid collection of topics, patterns on subscription for list of 
topics, with patterns, and with assignments

----


> remove null from subscribed topics  in KafkaConsumer#subscribe
> --------------------------------------------------------------
>
>                 Key: KAFKA-3905
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3905
>             Project: Kafka
>          Issue Type: Wish
>          Components: clients
>    Affects Versions: 0.10.0.0
>            Reporter: Xing Huang
>            Assignee: Rekha Joshi
>            Priority: Minor
>
> Currently, KafkaConsumer's subscribe methods accept Collection<String> as 
> topics to be subscribed, but a Collection may have null as its element. For 
> example
> {code}
>             String topic = null;
>             Collection<String> topics = Arrays.asList(topic);
>             consumer.subscribe(topics)
> {code}
> When this happens, consumer will throw a puzzling NullPointerException:
> {code}
>       at org.apache.kafka.common.utils.Utils.utf8Length(Utils.java:245)
>       at org.apache.kafka.common.protocol.types.Type$6.sizeOf(Type.java:248)
>       at 
> org.apache.kafka.common.protocol.types.ArrayOf.sizeOf(ArrayOf.java:85)
>       at org.apache.kafka.common.protocol.types.Schema.sizeOf(Schema.java:89)
>       at org.apache.kafka.common.protocol.types.Struct.sizeOf(Struct.java:244)
>       at 
> org.apache.kafka.common.requests.RequestSend.serialize(RequestSend.java:35)
>       at 
> org.apache.kafka.common.requests.RequestSend.<init>(RequestSend.java:29)
>       at 
> org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.request(NetworkClient.java:616)
>       at 
> org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.maybeUpdate(NetworkClient.java:639)
>       at 
> org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.maybeUpdate(NetworkClient.java:552)
>       at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:258)
>       at 
> org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.clientPoll(ConsumerNetworkClient.java:360)
>       at 
> org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:224)
>       at 
> org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:192)
>       at 
> org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:163)
>       at 
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureCoordinatorReady(AbstractCoordinator.java:179)
>       at 
> org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:970)
>       at 
> org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:934)
> {code}
> Maybe it's better to remove null when doing subscription.



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