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MINOR: Added doc for KIP-535 and updated it for KIP-562 (#8395) 

Reviewers: Boyang Chen <boyang@confluent.io>, Vinoth Chandar <vchandar@confluent.io>, Matthias J. Sax <matthias@confluent.io>
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Navinder Pal Singh Brar 2020-05-27 04:54:00 +05:30 committed by GitHub
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</p> </p>
<p> <p>
Deprecated <code>KafkaStreams.store(String, QueryableStoreType)</code> and replaced it with <code>KafkaStreams.store(StoreQueryParameters)</code> to allow querying Deprecated <code>KafkaStreams.store(String, QueryableStoreType)</code> and replaced it with <code>KafkaStreams.store(StoreQueryParameters)</code> to allow querying
for specific partition and specific task type as per for a store with variety of parameters, including querying a specific task and stale stores, as per
<a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-562%3A+Allow+fetching+a+key+from+a+single+partition+rather+than+iterating+over+all+the+stores+on+an+instance">KIP-562</a>. <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-562%3A+Allow+fetching+a+key+from+a+single+partition+rather+than+iterating+over+all+the+stores+on+an+instance">KIP-562</a> and
<a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-535%3A+Allow+state+stores+to+serve+stale+reads+during+rebalance">KIP-535</a> respectively.
</p> </p>
<h3><a id="streams_api_changes_240" href="#streams_api_changes_240">Streams API changes in 2.4.0</a></h3> <h3><a id="streams_api_changes_240" href="#streams_api_changes_240">Streams API changes in 2.4.0</a></h3>

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<a href="https://github.com/apache/kafka/tree/2.5/examples">examples</a> folder. Check out <a href="https://github.com/apache/kafka/tree/2.5/examples">examples</a> folder. Check out
<a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-447%3A+Producer+scalability+for+exactly+once+semantics">KIP-447</a> <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-447%3A+Producer+scalability+for+exactly+once+semantics">KIP-447</a>
for the full details.</li> for the full details.</li>
<li>Deprecated <code>KafkaStreams.store(String, QueryableStoreType)</code> and replaced it with <code>KafkaStreams.store(StoreQueryParameters)</code>.</li> <li>Added a new public api <code>KafkaStreams.queryMetadataForKey(String, K, Serializer) to get detailed information on the key being queried.
It provides information about the partition number where the key resides in addition to hosts containing the active and standby partitions for the key.</code></li>
<li>Provided support to query stale stores (for high availability) and the stores belonging to a specific partition by deprecating <code>KafkaStreams.store(String, QueryableStoreType)</code> and replacing it with <code>KafkaStreams.store(StoreQueryParameters)</code>.</li>
<li>Added a new public api to access lag information for stores local to an instance with <code>KafkaStreams.allLocalStorePartitionLags()</code>.</li>
<li>Scala 2.11 is no longer supported. See <li>Scala 2.11 is no longer supported. See
<a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-531%3A+Drop+support+for+Scala+2.11+in+Kafka+2.5">KIP-531</a> <a href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-531%3A+Drop+support+for+Scala+2.11+in+Kafka+2.5">KIP-531</a>
for details.</li> for details.</li>