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>

docs/streams/upgrade-guide.html

@@ -123,8 +123,9 @@
     </p>
     <p>
         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
-        <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>.
+        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> 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>
 
     <h3><a id="streams_api_changes_240" href="#streams_api_changes_240">Streams API changes in 2.4.0</a></h3>

docs/upgrade.html

@@ -46,7 +46,10 @@
         <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>
         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
         <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>