[jira] [Commented] (IGNITE-4140) KafkaStreamer should use tuple extractor instead of decoders

["Anton Vinogradov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-4140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15711788#comment-15711788 ] 

Anton Vinogradov commented on IGNITE-4140:
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1) [~vkulichenko], what do you think? 
Seems, we just need to replace old streamed with new one?

2) http://reviews.ignite.apache.org/ignite/view
Brief instructions:
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> KafkaStreamer should use tuple extractor instead of decoders
> ------------------------------------------------------------
>
>                 Key: IGNITE-4140
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4140
>             Project: Ignite
>          Issue Type: Improvement
>          Components: streaming
>    Affects Versions: 1.7
>            Reporter: Valentin Kulichenko
>            Assignee: Anil
>              Labels: patch-available
>             Fix For: 2.0
>
>
> Current design of {{KafkaStreamer}} looks incorrect to me. In particular, it extends {{StreamAdapter}}, but ignores tuple extractors provided there and uses native Kafka decoders instead. This for example makes impossible to produce several entries from one message, like it can be done via {{StreamMultipleTupleExtractor}} in other streamers.
> To fix this, we should:
> # Declare the {{KafkaStreamer}} like this:
> {code}
> KafkaStreamer<K, V> extends StreamAdapter<MessageAndMetadata<byte[], byte[]>, K, V>
> {code}
> # Remove {{keyDecoder}} and {{valDecoder}} in favor of tuple extractors.
> # Instead of doing {{getStreamer().addData(...)}} directly, call {{addMessage(...)}} method providing the raw message consumed from Kafka ({{MessageAndMetadata<byte[], byte[]>}}). This method will make sure that configured extractor is invoked and that all entries are added to {{IgniteDataStreamer}}.



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