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  1. IMPALA
  2. IMPALA-699

Deadlock in statestore when unregistering a subscriber and building a topic update

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Details

    • Bug
    • Status: Resolved
    • Blocker
    • Resolution: Fixed
    • Impala 1.2.1
    • Impala 1.2.2
    • None
    • None

    Description

      There is a deadlock in the statestore when unregistering a subscriber and also building a topic update. This is because UnregisterSubscriber() first takes the subscribers_ lock and then takes the topics_ lock to remove all transient entries. In ProcessOneSubscriber() we take the topics_ lock and then the subscribers_ lock in GetMinSubscriberTopicVersion() to build an update to send. This can clearly lead to a deadlock.

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            lskuff Lenni Kuff
            lskuff Lenni Kuff
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              Created:
              Updated:
              Resolved: