Uploaded image for project: 'Kafka'
  1. Kafka
  2. KAFKA-4123

Queryable State returning null for key before all stores in instance have been initialized

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.10.1.0
    • Fix Version/s: 0.10.1.0
    • Component/s: streams
    • Labels:
      None

      Description

      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.

        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                damianguy Damian Guy
                Reporter:
                damianguy Damian Guy
              • Votes:
                0 Vote for this issue
                Watchers:
                3 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: