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From "Matthias J. Sax (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-5309) Stores not queryable after one thread died
Date Tue, 23 May 2017 00:56:04 GMT
Matthias J. Sax created KAFKA-5309:

             Summary: Stores not queryable after one thread died
                 Key: KAFKA-5309
                 URL: https://issues.apache.org/jira/browse/KAFKA-5309
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions:
            Reporter: Matthias J. Sax
            Assignee: Matthias J. Sax

For a multi threaded Streams instance, it can happen that one thread dies while all other
threads (within a single instance) keep running. Even if this is an rare scenario, we should
allow querying the stores after rebalance finished. However, this does never happen, as the
died thread's state is still in {{KafkaStreams}} thread state map (as {{NOT_RUNNING}}), and
thus, {{KafkaStreams}} itself is in state {{REBALANCING}} all the time and does not transit
back to {{RUNNING}}.

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