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Posted to dev@kafka.apache.org by Guozhang Wang <gu...@linkedin.com> on 2014/04/07 20:03:54 UTC
Re: Review Request 19731: Patch for KAFKA-1328
-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/19731/#review39700
-----------------------------------------------------------
clients/src/main/java/kafka/clients/consumer/Consumer.java
<https://reviews.apache.org/r/19731/#comment72291>
subscribe(topic, partitions) => subscribe(partitions)
clients/src/main/java/kafka/clients/consumer/Consumer.java
<https://reviews.apache.org/r/19731/#comment72287>
Just wanted to confirm again that we agree to expose TopicPartition to users? Though it is already in common package, it currently only used internally.
clients/src/main/java/kafka/clients/consumer/Consumer.java
<https://reviews.apache.org/r/19731/#comment72288>
Does this mean subscribe(TopicPartition) followed by an unsubscribe(String) will also throw an error?
clients/src/main/java/kafka/clients/consumer/Consumer.java
<https://reviews.apache.org/r/19731/#comment72293>
Ditto as above.
clients/src/main/java/kafka/clients/consumer/Consumer.java
<https://reviews.apache.org/r/19731/#comment72294>
"If no offsets are specified", how does this mean as map values? Or should we say sth like "If the specified offset is negative.."
clients/src/main/java/kafka/clients/consumer/Consumer.java
<https://reviews.apache.org/r/19731/#comment72295>
Ditto above.
clients/src/main/java/kafka/clients/consumer/Consumer.java
<https://reviews.apache.org/r/19731/#comment72296>
Not sure if we have discussed details about how to implement async commit in the new consumer?
clients/src/main/java/kafka/clients/consumer/Consumer.java
<https://reviews.apache.org/r/19731/#comment72297>
"starting fetch offsets", "fetch position": inconsistency terms.
clients/src/main/java/kafka/clients/consumer/Consumer.java
<https://reviews.apache.org/r/19731/#comment72298>
"...that the consumer currently consumes from" => from the API it seems we can get any partitions' offsets?
clients/src/main/java/kafka/clients/consumer/Consumer.java
<https://reviews.apache.org/r/19731/#comment72299>
We need to be a bit clearer about the timestamp: it is the timestamp of the message when it reaches the broker, not the consumer.
clients/src/main/java/kafka/clients/consumer/ConsumerConfig.java
<https://reviews.apache.org/r/19731/#comment72300>
ENABLE_AUTO_COMMIT_CONFIG to be consistent with ENABLE_JMX_CONFIG
clients/src/main/java/kafka/clients/consumer/ConsumerConfig.java
<https://reviews.apache.org/r/19731/#comment72301>
fetch.buffer.bytes
clients/src/main/java/kafka/clients/consumer/ConsumerConfig.java
<https://reviews.apache.org/r/19731/#comment72302>
AUTO_OFFSET_RESET_CONFIG is missing.
clients/src/main/java/kafka/clients/consumer/ConsumerRebalanceCallback.java
<https://reviews.apache.org/r/19731/#comment72304>
Have we considered the following case: in a poll() function the consumer realized a rebalance is triggered, and hence call onPartitionRevoked and onPartitionAssigned, and then poll() times out, the user then call commit(partitions) on the old partitions.
clients/src/main/java/kafka/clients/consumer/ConsumerRecord.java
<https://reviews.apache.org/r/19731/#comment72306>
Suggest add the following functions:
compressionType()
clients/src/main/java/kafka/clients/consumer/KafkaConsumer.java
<https://reviews.apache.org/r/19731/#comment72309>
Two constructors KafkaConsumer(ConsumerConfig config) and KafkaConsumer(ConsumerConfig config, ConsumerRebalanceCallback callback) missing.
clients/src/main/java/kafka/common/TopicPartitionOffset.java
<https://reviews.apache.org/r/19731/#comment72311>
This class is currently only used in user customized callback function. So do we really need to provide this class?
- Guozhang Wang
On March 27, 2014, 4:16 p.m., Neha Narkhede wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/19731/
> -----------------------------------------------------------
>
> (Updated March 27, 2014, 4:16 p.m.)
>
>
> Review request for kafka.
>
>
> Bugs: KAFKA-1328
> https://issues.apache.org/jira/browse/KAFKA-1328
>
>
> Repository: kafka
>
>
> Description
> -------
>
> Added license headers
>
>
> Cleaned javadoc for ConsumerConfig
>
>
> Fixed minor indentation in ConsumerConfig
>
>
> Improve docs on ConsumerConfig
>
>
> 1. Added ClientUtils 2. Added basic constructor implementation for KafkaConsumer
>
>
> Improved MockConsumer
>
>
> Chris's feedback and also consumer rewind example code
>
>
> Added commit() and commitAsync() APIs to the consumer and updated docs and examples to reflect that
>
>
> 1. Added consumer usage examples to javadoc 2. Changed signature of APIs that accept or return offsets from list of offsets to map of offsets
>
>
> Improved example for using ConsumerRebalanceCallback
>
>
> Improved example for using ConsumerRebalanceCallback
>
>
> Included Jun's review comments and renamed positions to seek. Also included position()
>
>
> Changes to javadoc for positions()
>
>
> Changed the javadoc for ConsumerRebalanceCallback
>
>
> Changing unsubscribe to also take in var args for topic list
>
>
> Incorporated first round of feedback from Jay, Pradeep and Mattijs on the mailing list
>
>
> Updated configs
>
>
> Javadoc for consumer complete
>
>
> Completed docs for Consumer and ConsumerRebalanceCallback. Added MockConsumer
>
>
> Added the initial interfaces and related documentation for the consumer. More docs required to complete the public API
>
>
> Diffs
> -----
>
> clients/src/main/java/kafka/clients/consumer/Consumer.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/ConsumerConfig.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/ConsumerRebalanceCallback.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/ConsumerRecord.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/KafkaConsumer.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/MockConsumer.java PRE-CREATION
> clients/src/main/java/kafka/common/TopicPartitionOffset.java PRE-CREATION
> clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java 1ff9174870a8c9cd97eb6655416edd4124377b0e
> clients/src/main/java/org/apache/kafka/common/utils/ClientUtils.java PRE-CREATION
> clients/src/test/java/org/apache/kafka/clients/consumer/ConsumerExampleTest.java PRE-CREATION
>
> Diff: https://reviews.apache.org/r/19731/diff/
>
>
> Testing
> -------
>
>
> Thanks,
>
> Neha Narkhede
>
>
Re: Review Request 19731: Patch for KAFKA-1328
Posted by Neha Narkhede <ne...@gmail.com>.
> On April 7, 2014, 6:03 p.m., Guozhang Wang wrote:
> > clients/src/main/java/kafka/clients/consumer/ConsumerConfig.java, line 55
> > <https://reviews.apache.org/r/19731/diff/1/?file=538461#file538461line55>
> >
> > ENABLE_AUTO_COMMIT_CONFIG to be consistent with ENABLE_JMX_CONFIG
>
> Neha Narkhede wrote:
> Well, I removed it and added the corresponding metrics reporter configs to stay consistent with the producer.
I meant to say that I removed ENABLE_JMX. Will rename AUTO_COMMIT_ENABLE.
- Neha
-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/19731/#review39700
-----------------------------------------------------------
On March 27, 2014, 4:16 p.m., Neha Narkhede wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/19731/
> -----------------------------------------------------------
>
> (Updated March 27, 2014, 4:16 p.m.)
>
>
> Review request for kafka.
>
>
> Bugs: KAFKA-1328
> https://issues.apache.org/jira/browse/KAFKA-1328
>
>
> Repository: kafka
>
>
> Description
> -------
>
> Added license headers
>
>
> Cleaned javadoc for ConsumerConfig
>
>
> Fixed minor indentation in ConsumerConfig
>
>
> Improve docs on ConsumerConfig
>
>
> 1. Added ClientUtils 2. Added basic constructor implementation for KafkaConsumer
>
>
> Improved MockConsumer
>
>
> Chris's feedback and also consumer rewind example code
>
>
> Added commit() and commitAsync() APIs to the consumer and updated docs and examples to reflect that
>
>
> 1. Added consumer usage examples to javadoc 2. Changed signature of APIs that accept or return offsets from list of offsets to map of offsets
>
>
> Improved example for using ConsumerRebalanceCallback
>
>
> Improved example for using ConsumerRebalanceCallback
>
>
> Included Jun's review comments and renamed positions to seek. Also included position()
>
>
> Changes to javadoc for positions()
>
>
> Changed the javadoc for ConsumerRebalanceCallback
>
>
> Changing unsubscribe to also take in var args for topic list
>
>
> Incorporated first round of feedback from Jay, Pradeep and Mattijs on the mailing list
>
>
> Updated configs
>
>
> Javadoc for consumer complete
>
>
> Completed docs for Consumer and ConsumerRebalanceCallback. Added MockConsumer
>
>
> Added the initial interfaces and related documentation for the consumer. More docs required to complete the public API
>
>
> Diffs
> -----
>
> clients/src/main/java/kafka/clients/consumer/Consumer.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/ConsumerConfig.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/ConsumerRebalanceCallback.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/ConsumerRecord.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/KafkaConsumer.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/MockConsumer.java PRE-CREATION
> clients/src/main/java/kafka/common/TopicPartitionOffset.java PRE-CREATION
> clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java 1ff9174870a8c9cd97eb6655416edd4124377b0e
> clients/src/main/java/org/apache/kafka/common/utils/ClientUtils.java PRE-CREATION
> clients/src/test/java/org/apache/kafka/clients/consumer/ConsumerExampleTest.java PRE-CREATION
>
> Diff: https://reviews.apache.org/r/19731/diff/
>
>
> Testing
> -------
>
>
> Thanks,
>
> Neha Narkhede
>
>
Re: Review Request 19731: Patch for KAFKA-1328
Posted by Neha Narkhede <ne...@gmail.com>.
> On April 7, 2014, 6:03 p.m., Guozhang Wang wrote:
> > clients/src/main/java/kafka/clients/consumer/Consumer.java, line 41
> > <https://reviews.apache.org/r/19731/diff/1/?file=538460#file538460line41>
> >
> > Just wanted to confirm again that we agree to expose TopicPartition to users? Though it is already in common package, it currently only used internally.
Right. After writing down some examples using the APIs, I'm convinced that we need to expose TopicPartition. Take a look at the examples to see if you can think of a better solution.
> On April 7, 2014, 6:03 p.m., Guozhang Wang wrote:
> > clients/src/main/java/kafka/clients/consumer/Consumer.java, line 45
> > <https://reviews.apache.org/r/19731/diff/1/?file=538460#file538460line45>
> >
> > Does this mean subscribe(TopicPartition) followed by an unsubscribe(String) will also throw an error?
That's correct. I think it says that it only works in conjunction with subscribe(topics), so yes that will throw some exception.
> On April 7, 2014, 6:03 p.m., Guozhang Wang wrote:
> > clients/src/main/java/kafka/clients/consumer/Consumer.java, line 54
> > <https://reviews.apache.org/r/19731/diff/1/?file=538460#file538460line54>
> >
> > Ditto as above.
Here is what it says -
It is an error to unsubscribe from a partition that was never subscribed to using {@link #subscribe(TopicPartition...) subscribe(partitions)}
> On April 7, 2014, 6:03 p.m., Guozhang Wang wrote:
> > clients/src/main/java/kafka/clients/consumer/Consumer.java, line 77
> > <https://reviews.apache.org/r/19731/diff/1/?file=538460#file538460line77>
> >
> > "If no offsets are specified", how does this mean as map values? Or should we say sth like "If the specified offset is negative.."
That comment was stale given that we also have commit() and commitAsync(). Removed it.
> On April 7, 2014, 6:03 p.m., Guozhang Wang wrote:
> > clients/src/main/java/kafka/clients/consumer/Consumer.java, line 92
> > <https://reviews.apache.org/r/19731/diff/1/?file=538460#file538460line92>
> >
> > Not sure if we have discussed details about how to implement async commit in the new consumer?
It just means the consumer will not wait for the OffsetCommitResponse before returning from commitAsync(). We can discuss details on the wiki, but looks like we have to add this API. I can imagine several applications that would not want to commit synchronously.
> On April 7, 2014, 6:03 p.m., Guozhang Wang wrote:
> > clients/src/main/java/kafka/clients/consumer/ConsumerConfig.java, line 55
> > <https://reviews.apache.org/r/19731/diff/1/?file=538461#file538461line55>
> >
> > ENABLE_AUTO_COMMIT_CONFIG to be consistent with ENABLE_JMX_CONFIG
Well, I removed it and added the corresponding metrics reporter configs to stay consistent with the producer.
> On April 7, 2014, 6:03 p.m., Guozhang Wang wrote:
> > clients/src/main/java/kafka/clients/consumer/ConsumerConfig.java, line 112
> > <https://reviews.apache.org/r/19731/diff/1/?file=538461#file538461line112>
> >
> > fetch.buffer.bytes
I think we might not need this config, but we can revisit when we discuss the memory management
> On April 7, 2014, 6:03 p.m., Guozhang Wang wrote:
> > clients/src/main/java/kafka/clients/consumer/ConsumerRecord.java, line 22
> > <https://reviews.apache.org/r/19731/diff/1/?file=538463#file538463line22>
> >
> > Suggest add the following functions:
> >
> > compressionType()
I'm not so sure that it will make sense. The consumer record is always the original raw record and is always handed out after the decompression anyways. Thoughts?
> On April 7, 2014, 6:03 p.m., Guozhang Wang wrote:
> > clients/src/main/java/kafka/common/TopicPartitionOffset.java, line 13
> > <https://reviews.apache.org/r/19731/diff/1/?file=538466#file538466line13>
> >
> > This class is currently only used in user customized callback function. So do we really need to provide this class?
Nope. After the latest API changes I made, this class can be deleted.
> On April 7, 2014, 6:03 p.m., Guozhang Wang wrote:
> > clients/src/main/java/kafka/clients/consumer/KafkaConsumer.java, line 337
> > <https://reviews.apache.org/r/19731/diff/1/?file=538464#file538464line337>
> >
> > Two constructors KafkaConsumer(ConsumerConfig config) and KafkaConsumer(ConsumerConfig config, ConsumerRebalanceCallback callback) missing.
The latter is there, I added the former
> On April 7, 2014, 6:03 p.m., Guozhang Wang wrote:
> > clients/src/main/java/kafka/clients/consumer/ConsumerRebalanceCallback.java, lines 26-47
> > <https://reviews.apache.org/r/19731/diff/1/?file=538462#file538462line26>
> >
> > Have we considered the following case: in a poll() function the consumer realized a rebalance is triggered, and hence call onPartitionRevoked and onPartitionAssigned, and then poll() times out, the user then call commit(partitions) on the old partitions.
That's a dangerous use of commit(), I think we discussed that the co-ordinator will reject requests to commit offsets for partitions that the consumer id doesn't own. I think the API docs can be updated to specify that.
- Neha
-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/19731/#review39700
-----------------------------------------------------------
On March 27, 2014, 4:16 p.m., Neha Narkhede wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/19731/
> -----------------------------------------------------------
>
> (Updated March 27, 2014, 4:16 p.m.)
>
>
> Review request for kafka.
>
>
> Bugs: KAFKA-1328
> https://issues.apache.org/jira/browse/KAFKA-1328
>
>
> Repository: kafka
>
>
> Description
> -------
>
> Added license headers
>
>
> Cleaned javadoc for ConsumerConfig
>
>
> Fixed minor indentation in ConsumerConfig
>
>
> Improve docs on ConsumerConfig
>
>
> 1. Added ClientUtils 2. Added basic constructor implementation for KafkaConsumer
>
>
> Improved MockConsumer
>
>
> Chris's feedback and also consumer rewind example code
>
>
> Added commit() and commitAsync() APIs to the consumer and updated docs and examples to reflect that
>
>
> 1. Added consumer usage examples to javadoc 2. Changed signature of APIs that accept or return offsets from list of offsets to map of offsets
>
>
> Improved example for using ConsumerRebalanceCallback
>
>
> Improved example for using ConsumerRebalanceCallback
>
>
> Included Jun's review comments and renamed positions to seek. Also included position()
>
>
> Changes to javadoc for positions()
>
>
> Changed the javadoc for ConsumerRebalanceCallback
>
>
> Changing unsubscribe to also take in var args for topic list
>
>
> Incorporated first round of feedback from Jay, Pradeep and Mattijs on the mailing list
>
>
> Updated configs
>
>
> Javadoc for consumer complete
>
>
> Completed docs for Consumer and ConsumerRebalanceCallback. Added MockConsumer
>
>
> Added the initial interfaces and related documentation for the consumer. More docs required to complete the public API
>
>
> Diffs
> -----
>
> clients/src/main/java/kafka/clients/consumer/Consumer.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/ConsumerConfig.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/ConsumerRebalanceCallback.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/ConsumerRecord.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/KafkaConsumer.java PRE-CREATION
> clients/src/main/java/kafka/clients/consumer/MockConsumer.java PRE-CREATION
> clients/src/main/java/kafka/common/TopicPartitionOffset.java PRE-CREATION
> clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java 1ff9174870a8c9cd97eb6655416edd4124377b0e
> clients/src/main/java/org/apache/kafka/common/utils/ClientUtils.java PRE-CREATION
> clients/src/test/java/org/apache/kafka/clients/consumer/ConsumerExampleTest.java PRE-CREATION
>
> Diff: https://reviews.apache.org/r/19731/diff/
>
>
> Testing
> -------
>
>
> Thanks,
>
> Neha Narkhede
>
>
Re: Review Request 19731: Patch for KAFKA-1328
Posted by Guozhang Wang <gu...@linkedin.com>.
> On April 7, 2014, 6:03 p.m., Guozhang Wang wrote:
> > clients/src/main/java/kafka/clients/consumer/ConsumerRecord.java, line 22
> > <https://reviews.apache.org/r/19731/diff/1/?file=538463#file538463line22>
> >
> > Suggest add the following functions:
> >
> > compressionType()
>
> Neha Narkhede wrote:
> I'm not so sure that it will make sense. The consumer record is always the original raw record and is always handed out after the decompression anyways. Thoughts?
As we have discussed off-line, since we are always going to return the raw messages, i.e. use deep iterators, I think we do not need this attribute.
- Guozhang
-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/19731/#review39700
-----------------------------------------------------------
On April 13, 2014, 2:12 a.m., Neha Narkhede wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/19731/
> -----------------------------------------------------------
>
> (Updated April 13, 2014, 2:12 a.m.)
>
>
> Review request for kafka.
>
>
> Bugs: KAFKA-1328
> https://issues.apache.org/jira/browse/KAFKA-1328
>
>
> Repository: kafka
>
>
> Description
> -------
>
> Fixed the javadoc usage examples in KafkaConsumer to match the API changes
>
>
> Changed the signature of poll to return Map<String,ConsumerRecordMetadata> to organize the ConsumerRecords around topic and then optionally around partition. This will serve the group management as well as custom partition subscription use cases
>
>
> 1. Changed the signature of poll() to return Map<String, List<ConsumerRecord>> 2. Changed ConsumerRecord to throw an exception if an error is detected for the partition. For example, if a single large message is larger than the total memory just for that partition, we don't want poll() to throw an exception since that will affect the processing of the remaining partitions as well
>
>
> Fixed MockConsumer to make subscribe(topics) and subscribe(partitions) mutually exclusive
>
>
> Changed the package to org.apache.kafka.clients.consumer from kafka.clients.consumer
>
>
> Changed the package to org.apache.kafka.clients.consumer from kafka.clients.consumer
>
>
> 1. Removed the commitAsync() APIs 2. Changed the commit() APIs to return a Future
>
>
> Fixed configs to match the producer side configs for metrics
>
>
> Renamed AUTO_COMMIT_ENABLE_CONFIG to ENABLE_AUTO_COMMIT_CONFIG
>
>
> Addressing review comments from Tim and Guozhang
>
>
> Rebasing after producer side config cleanup
>
>
> Added license headers
>
>
> Cleaned javadoc for ConsumerConfig
>
>
> Fixed minor indentation in ConsumerConfig
>
>
> Improve docs on ConsumerConfig
>
>
> 1. Added ClientUtils 2. Added basic constructor implementation for KafkaConsumer
>
>
> Improved MockConsumer
>
>
> Chris's feedback and also consumer rewind example code
>
>
> Added commit() and commitAsync() APIs to the consumer and updated docs and examples to reflect that
>
>
> 1. Added consumer usage examples to javadoc 2. Changed signature of APIs that accept or return offsets from list of offsets to map of offsets
>
>
> Improved example for using ConsumerRebalanceCallback
>
>
> Improved example for using ConsumerRebalanceCallback
>
>
> Included Jun's review comments and renamed positions to seek. Also included position()
>
>
> Changes to javadoc for positions()
>
>
> Changed the javadoc for ConsumerRebalanceCallback
>
>
> Changing unsubscribe to also take in var args for topic list
>
>
> Incorporated first round of feedback from Jay, Pradeep and Mattijs on the mailing list
>
>
> Updated configs
>
>
> Javadoc for consumer complete
>
>
> Completed docs for Consumer and ConsumerRebalanceCallback. Added MockConsumer
>
>
> Added the initial interfaces and related documentation for the consumer. More docs required to complete the public API
>
>
> Diffs
> -----
>
> clients/src/main/java/kafka/common/TopicPartitionOffset.java PRE-CREATION
> clients/src/main/java/org/apache/kafka/clients/consumer/Consumer.java PRE-CREATION
> clients/src/main/java/org/apache/kafka/clients/consumer/ConsumerConfig.java PRE-CREATION
> clients/src/main/java/org/apache/kafka/clients/consumer/ConsumerRebalanceCallback.java PRE-CREATION
> clients/src/main/java/org/apache/kafka/clients/consumer/ConsumerRecord.java PRE-CREATION
> clients/src/main/java/org/apache/kafka/clients/consumer/KafkaConsumer.java PRE-CREATION
> clients/src/main/java/org/apache/kafka/clients/consumer/MockConsumer.java PRE-CREATION
> clients/src/main/java/org/apache/kafka/clients/consumer/OffsetMetadata.java PRE-CREATION
> clients/src/main/java/org/apache/kafka/clients/consumer/internals/FutureOffsetMetadata.java PRE-CREATION
> clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java a6423f4b37a57f0290e2048b764de1218470f4f7
> clients/src/main/java/org/apache/kafka/common/utils/ClientUtils.java PRE-CREATION
> clients/src/test/java/org/apache/kafka/clients/consumer/ConsumerExampleTest.java PRE-CREATION
>
> Diff: https://reviews.apache.org/r/19731/diff/
>
>
> Testing
> -------
>
>
> Thanks,
>
> Neha Narkhede
>
>