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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-1796] Sanity check partition command line tools - Kafka - [issue]
...We need to sanity check the input json has the valid values before triggering the admin process. For example, we have seen a scenario where the json input for partition reassignment tools ha...
http://issues.apache.org/jira/browse/KAFKA-1796    Author: Guozhang Wang, 2014-12-04, 05:01
[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
[expand - 1 more] - Re: How many messages does each broker have? - Kafka - [mail # user]
...Palur,First you need to make sure the message is received at Kafka:message.max.bytescontrols the maximum size of a message that can be accepted, andfetch.message.max.bytescontrols the maximu...
   Author: Guozhang Wang, 2014-12-03, 01:16
Re: Zookeeper load burst during replication - Kafka - [mail # user]
...Kafka brokers uses ZK for metadata storage, and Kafka consumer clients usesZK for offset and member management.For metadata storage, when there is replica state changes (for example likethe ...
   Author: Guozhang Wang, 2014-12-02, 19:30
[expand - 1 more] - Re: MetadataResponse error code handling - Kafka - [mail # user]
...For the new producer, the only error code that will result in invalidpartition metadata is LeaderNotAvailable, and as for the implementationdetails of the KAFKA-1609 patch, it handles this e...
   Author: Guozhang Wang, 2014-11-26, 19:24
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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