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https://issues.apache.org/jira/browse/KAFKA-2412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14709974#comment-14709974
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James Cheng commented on KAFKA-2412:
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[~gchao], here are some slides that describe how out-of-order arrival is
possible:
http://www.slideshare.net/JiangjieQin/no-data-loss-pipeline-with-apache-kafka-49753844
> Documentation bug: Add information for key.serializer and value.serializer to
> New Producer Config sections
> ----------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-2412
> URL: https://issues.apache.org/jira/browse/KAFKA-2412
> Project: Kafka
> Issue Type: Bug
> Reporter: Jeremy Fields
> Assignee: Grayson Chao
> Priority: Minor
> Labels: newbie
> Attachments: KAFKA-2412-r1.diff, KAFKA-2412.diff
>
>
> As key.serializer and value.serializer are required options when using the
> new producer, they should be mentioned in the documentation ( here and svn
> http://kafka.apache.org/documentation.html#newproducerconfigs )
> Appropriate values for these options exist in javadoc and producer.java
> examples; however, not everyone is reading those, as is the case for anyone
> setting up a producer.config file for mirrormaker.
> A sensible default should be suggested, such as
> org.apache.kafka.common.serialization.StringSerializer
> Or at least a mention of the key.serializer and value.serializer options
> along with a link to javadoc
> Thanks
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