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https://issues.apache.org/jira/browse/KAFKA-4123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15472282#comment-15472282
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ASF GitHub Bot commented on KAFKA-4123:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/1824
> Queryable State returning null for key before all stores in instance have
> been initialized
> ------------------------------------------------------------------------------------------
>
> Key: KAFKA-4123
> URL: https://issues.apache.org/jira/browse/KAFKA-4123
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.1.0
> Reporter: Damian Guy
> Assignee: Damian Guy
> Fix For: 0.10.1.0
>
>
> A couple of problems:
> 1. A RocksDBStore instance is currently marked as open before the store has
> been initialized from its changelog. This can result in reading old/invalid
> data when querying.
> 2. In the case of multiple partitions and the tasks are being initialized it
> is always possible that 1 or more StateStores will be intialized before the
> complete set of stores in the Streams Instance are initialized. Currently
> when this happens a query can return null because it will look in the
> existing initialized stores. However, the key may exist in one of the
> non-initialized instances. We need to wait for all Stores in the instance to
> be initialized before allowing queries to progress.
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