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From Rajini Sivaram <rajinisiva...@gmail.com>
Subject Re: Consumption on a explicitly (dynamically) created topic has a 5 minute delay
Date Thu, 02 Mar 2017 13:41:23 GMT
This issue is being addressed in KAFKA-4631. See
https://issues.apache.org/jira/browse/KAFKA-4631 and the discussion in the
PR https://github.com/apache/kafka/pull/2622 for details.

Regards,

Rajini

On Thu, Mar 2, 2017 at 4:35 AM, Jaikiran Pai <jai.forums2013@gmail.com>
wrote:

> For future reference - I asked this question on dev mailing list and based
> on the discussion there was able to come up with a workaround to get this
> working. Details here https://www.mail-archive.com/d
> ev@kafka.apache.org/msg67613.html
>
> -Jaikiran
>
>
> On Wednesday 22 February 2017 01:16 PM, Jaikiran Pai wrote:
>
>> We are on Kafka 0.10.0.1 (server and client) and use Java
>> consumer/producer APIs. We have an application where we create Kafka topics
>> dynamically (using the AdminUtils Java API) and then start
>> producing/consuming on those topics. The issue we frequently run into is
>> this:
>>
>> 1. Application process creates a topic "foo-bar" via
>> AdminUtils.createTopic. This is sucessfully completed.
>> 2. Same application process then creates a consumer (using new Java
>> consumer API) on that foo-bar topic as a next step.
>> 3. The consumer that gets created in step#2 however, doesn't seem to be
>> enrolled in consumer group for this topic because of this (notice the last
>> line in the log):
>>
>> 2017-02-21 00:58:43,359 [Thread-6] DEBUG org.apache.kafka.clients.consumer.KafkaConsumer
>> - Kafka consumer created
>> 2017-02-21 00:58:43,360 [Thread-6] DEBUG org.apache.kafka.clients.consumer.KafkaConsumer
>> - Subscribed to topic(s): foo-bar
>> 2017-02-21 00:58:43,543 [Thread-6] DEBUG org.apache.kafka.clients.consu
>> mer.internals.AbstractCoordinator - Received group coordinator response
>> ClientResponse(receivedTimeMs=1487667523542, disconnected=false,
>> request=ClientRequest(expectResponse=true, callback=org.apache.kafka.clie
>> nts.consumer.internals.ConsumerNetworkClient$RequestFutureCo
>> mpletionHandler@50aad50f, request=RequestSend(header={ap
>> i_key=10,api_version=0,correlation_id=0,client_id=consumer-1},
>> body={group_id=my-app-group}), createdTimeMs=1487667523378,
>> sendTimeMs=1487667523529), responseBody={error_code=0,coo
>> rdinator={node_id=0,host=localhost,port=9092}})
>> 2017-02-21 00:58:43,543 [Thread-6] INFO org.apache.kafka.clients.consu
>> mer.internals.AbstractCoordinator - Discovered coordinator
>> localhost:9092 (id: 2147483647 rack: null) for group my-app-group.
>> 2017-02-21 00:58:43,545 [Thread-6] INFO org.apache.kafka.clients.consu
>> mer.internals.ConsumerCoordinator - Revoking previously assigned
>> partitions [] for group my-app-group
>> 2017-02-21 00:58:43,545 [Thread-6] INFO org.apache.kafka.clients.consu
>> mer.internals.AbstractCoordinator - (Re-)joining group my-app-group
>> 2017-02-21 00:58:43,548 [Thread-6] DEBUG org.apache.kafka.clients.consu
>> mer.internals.AbstractCoordinator - Sending JoinGroup
>> ({group_id=my-app-group,session_timeout=30000,member_id=,
>> protocol_type=consumer,group_protocols=[{protocol_name=
>> range,protocol_metadata=java.nio.HeapByteBuffer[pos=0 lim=59 cap=59]}]})
>> to coordinator localhost:9092 (id: 2147483647 <(214)%20748-3647> rack:
>> null)
>> 2017-02-21 00:58:43,548 [Thread-6] DEBUG org.apache.kafka.common.metrics.Metrics
>> - Added sensor with name node-2147483647.bytes-sent
>> 2017-02-21 00:58:43,549 [Thread-6] DEBUG org.apache.kafka.common.metrics.Metrics
>> - Added sensor with name node-2147483647.bytes-received
>> 2017-02-21 00:58:43,549 [Thread-6] DEBUG org.apache.kafka.common.metrics.Metrics
>> - Added sensor with name node-2147483647.latency
>> 2017-02-21 00:58:43,552 [Thread-6] DEBUG org.apache.kafka.clients.consu
>> mer.internals.AbstractCoordinator - Received successful join group
>> response for group my-app-group: {error_code=0,generation_id=1,
>> group_protocol=range,leader_id=consumer-1-1453e523-402a-43fe
>> -87e8-795ae4c68c5d,member_id=consumer-1-1453e523-402a-43fe-
>> 87e8-795ae4c68c5d,members=[{member_id=consumer-1-1453e523-
>> 402a-43fe-87e8-795ae4c68c5d,member_metadata=java.nio.HeapByteBuffer[pos=0
>> lim=59 cap=59]}]}
>> 2017-02-21 00:58:43,552 [Thread-6] DEBUG org.apache.kafka.clients.consu
>> mer.internals.ConsumerCoordinator - Performing assignment for group
>> my-app-group using strategy range with subscriptions
>> {consumer-1-1453e523-402a-43fe-87e8-795ae4c68c5d=Subscriptio
>> n(topics=[foo-bar])}
>> *2017-02-21 00:58:43,552 [Thread-6] DEBUG org.apache.kafka.clients.consu
>> mer.internals.AbstractPartitionAssignor - Skipping assignment for topic
>> foo-bar since no metadata is available*
>>
>>
>> 4. A few seconds later, a separate process, produces (via Java producer
>> API) on the foo-bar topic, some messages.
>> 5. The consumer created in step#2 (although is waiting for messages) on
>> the foo-bar topic, _doesn't_ consume these messages.
>> 6. *5 minutes later* the Kafka server triggers a consumer rebalance which
>> then successfully assigns partition(s) of this foo-bar topic to consumer
>> created in step#2 and the consumer start consuming these messages.
>>
>> This 5 minute delay in consuming messages from this dynamically created
>> topic is what we want to avoid. Is there anyway I can deterministically
>> do/force creation of a dynamic topic and be assured that upon completion of
>> that call, I can create a consumer and start consuming of that topic such
>> that it can receive messages as soon as the messages are produced on that
>> topic, without having to wait for a 5 minute delay (or whatever the
>> rebalance configuration is)? In essence, is there a way to ensure that the
>> Kafka consumer does get the topic metadata for a topic that was created
>> successfully by the same application, immediately?
>>
>>
>> P.S: We have topic auto creation disabled, so this isn't really a auto
>> topic creation issue. In our case we are explicitly invoking the create
>> topic operation via the Java API.
>>
>> -Jaikiran
>>
>
>

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