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[expand - 1 more] - Re: In what condition does getoffsetbefore (latest) not return latest offset? - Kafka - [mail # user]
...The offset request does not consider HW, and hence should not be affectedif it is not advanced yet.As Jun said, the getOffsetsBefore API just send an OffsetRequest to Kafkaand will get an Of...
   Author: Guozhang Wang, 2014-12-13, 02:11
[expand - 1 more] - Re: Is Kafka documentation regarding null key misleading? - Kafka - [mail # user]
...Steven,You can take a look at kafka.producer.async.DefaultEventHandler, ingetPartition function.GuozhangOn Thu, Dec 11, 2014 at 9:58 AM, Steven Wu  wrote: ...
   Author: Guozhang Wang, 2014-12-12, 00:39
[expand - 1 more] - Re: [DISCUSSION] adding the serializer api back to the new java producer - Kafka - [mail # user]
...Thanks Jun.I think we all understand the motivation of adding serialization API back,but are just proposing different ways of doing such. I personally prefer tonot bind the producer instance...
   Author: Guozhang Wang, 2014-12-12, 00:33
Re: How to raise a question in forum - Kafka - [mail # user]
...Nitin,You have found the place :) Just send an email to users@ mailing list isfine.GuozhangOn Tue, Dec 9, 2014 at 1:26 PM, nitin sharma wrote: ...
   Author: Guozhang Wang, 2014-12-09, 21:48
Re: Producer can writes to a follower during preferred lead election? - Kafka - [mail # user]
...Xiaoyu,I think your question is whether the following sequence can happen?1. A received becomes-leader, stop fetching from B.2. B received a producer request, and accepts it and append to lo...
   Author: Guozhang Wang, 2014-12-08, 21:02
[expand - 1 more] - Re: How to send serialized object in Kafka Producer - Kafka - [mail # user]
...You need to write your own serializer (e.g. BeanSerializer extendsEncoder[T]) for bean object and specify that in:properties.put("serializer.class","BeanSerializer")Guozhang ...
   Author: Guozhang Wang, 2014-12-05, 23:06
Re: How to create a reliable and fast Kafka Producer in a web server? - Kafka - [mail # user]
...Haojin,With the old "synchronized" API you can also enable asynchrony with thisconfig "producer.type" in the producer configs:http://kafka.apache.org/documentation.html#producerconfigsThe ne...
   Author: Guozhang Wang, 2014-12-04, 17:14
[expand - 1 more] - Re: Best practice for upgrading Kafka cluster from 0.8.1 to 0.8.1.1 - Kafka - [mail # user]
...You can still do the in-place upgrade, and the logs on the broker will bethen mixed with uncompressed and compressed messages. This is fine alsosince the consumers are able to de-compress dy...
   Author: Guozhang Wang, 2014-12-04, 17:09
[KAFKA-1800] KafkaException was not recorded at the per-topic metrics - Kafka - [issue]
...When KafkaException was thrown from producer.send() call, it is not recorded on the per-topic record-error-rate, but only the global error-rate.Since users are usually monitoring on the per-...
http://issues.apache.org/jira/browse/KAFKA-1800    Author: Guozhang Wang, 2014-12-04, 02:02
[expand - 1 more] - Re: Re: Pagecache cause OffsetOutOfRangeException - Kafka - [mail # user]
...OffsetOutOfRangeException will be returned when the requested partition'soffset range is [a, b] and the requested offset is either  b; theoffset range will be change whenever:1. new mes...
   Author: Guozhang Wang, 2014-12-03, 02:52
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB