milvus/configs/advanced/data_node.yaml

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dataNode:

  dataSync:
    flowGraph:
      maxQueueLength: 1024 # Maximum length of task queue in flowgraph
      maxParallelism: 1024 # Maximum number of tasks executed in parallel in the flowgraph

  flush:
    # Max buffer size to flush for a single segment.
    insertBufSize: 16777216 # Bytes, 16 MB