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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-4140) KafkaStreamer should use tuple extractor instead of decoders
Date Fri, 02 Dec 2016 12:42:59 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-4140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15715035#comment-15715035
] 

ASF GitHub Bot commented on IGNITE-4140:
----------------------------------------

Github user adasari closed the pull request at:

    https://github.com/apache/ignite/pull/1296


> 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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