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https://issues.apache.org/jira/browse/KAFKA-10500?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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A. Sophie Blee-Goldman reopened KAFKA-10500:
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> Add API to Start and Stop Stream Threads
> ----------------------------------------
>
> Key: KAFKA-10500
> URL: https://issues.apache.org/jira/browse/KAFKA-10500
> Project: Kafka
> Issue Type: New Feature
> Components: streams
> Reporter: Bruno Cadonna
> Assignee: Walker Carlson
> Priority: Major
> Labels: kip
> Fix For: 2.8.0
>
>
> Currently, there is no possibility in Kafka Streams to increase or decrease
> the number of stream threads after the Kafka Streams client has been started.
> Uncaught exceptions thrown in a stream thread kill the stream thread leaving
> the Kafka Streams client with less stream threads for processing than when
> the client was started. The only way to replace the killed stream thread is
> to restart the whole Kafka Streams client. For transient errors, it might
> make sense to replace a killed stream thread with a new one while users try
> to find the root cause of the error. That could be accomplished by starting a
> new stream thread in the uncaught exception handler of the killed stream
> thread.
> Part of KIP-663
> [https://cwiki.apache.org/confluence/display/KAFKA/KIP-663%3A+API+to+Start+and+Shut+Down+Stream+Threads]
>
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