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Merge pull request #728 from sobychacko/gh-706

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Introducing retry for finding state stores.
This commit is contained in:
Oleg Zhurakousky
2019-08-28 13:37:06 +02:00
committed by GitHub
parent cce392aa94 3e4af104b8
commit ca8e086d4c
4 changed files with 105 additions and 12 deletions
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10
docs/src/main/asciidoc/kafka-streams.adoc
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@@ -952,6 +952,16 @@ ReadOnlyKeyValueStore<Object, Object> keyValueStore =
interactiveQueryService.getQueryableStoreType("my-store", QueryableStoreTypes.keyValueStore());
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During the startup, the above method call to retrieve the startup might fail.
For e.g it might still be in the middle of initializing the state store.
In such cases, it will be useful to retry this operation.
Kafka Streams binder provides a simple retry mechanism to accommodate this.
Following are the two properties that you can use to control this retrying.
* spring.cloud.stream.binder.kafka.streams.stateStoreRetry.maxAttempts - Default is `1` .
* spring.cloud.stream.binder.kafka.streams.stateStoreRetry.backOffInterval - Default is `1000` milliseconds.
If there are multiple instances of the kafka streams application running, then before you can query them interactively, you need to identify which application instance hosts the key.
`InteractiveQueryService` API provides methods for identifying the host information.