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Latest activity by Caroline
  • Caroline created an article,

    "No such previous checkpoint found" error in streaming Supervisor

      We have observed high throughput streaming supervisors occasionally throwing the error: No such previous checkpoint [...] found This KB article describes how this error can occur due to a race co...

  • Caroline created an article,

    Druid Console fallback for XL clusters

      The unified Druid Console was introduced in Imply 2.9 / Druid 0.14. This console is based on API calls to system schema tables, which were introduced in Druid 0.13. In a cluster with a large numb...

  • Caroline created an article,

    How do kill tasks work?

    When a kill task is submitted, it completes these three steps: 1. Gets a list of all segments marked as unused (used=0) in the metadata store. 2. Loops through each segment, deletes from druid_segm...

  • Caroline created an article,

    Zookeeper: Best Practices for Imply

    A Druid cluster can only be as stable as its Zookeeper. By design, Druid nodes are prevented from talking to each other. Zookeeper is responsible for much of the communication that keeps the Druid ...

  • Caroline created an article,

    Kerberized Kafka Ingestion

    For an overview of Kafka security features and guidance for setting up Kerberized Kafka, please see:   I...

  • Caroline created an article,

    Kafka Indexing -> Segment Flow

    Where do Kafka messages go when they Enter the Druid? Do they morph into insects? Do they exist at all? This diagram shows the relationship between partitions on the Kafka broker, ingestion tasks, ...

  • Caroline created an article,

    Avro ingestion from Kafka using Confluent Schema Registry

    This article provides steps for one method to test avro ingestion locally using the Imply distribution. The example sends nested avro using parser type: avro_stream and avroBytesDecoder type: schem...