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https://issues.apache.org/jira/browse/IGNITE-4140?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anil reassigned IGNITE-4140:
----------------------------
Assignee: Anil
> 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
> 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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