Package org.apache.flink.runtime.taskexecutor

Interface GlobalAggregateManager

  • All Known Implementing Classes:
    RpcGlobalAggregateManager
    public interface GlobalAggregateManager
    This interface gives access to transient, named, global aggregates. This can be used to share state amongst parallel tasks in a job. It is not designed for high throughput updates and the aggregates do NOT survive a job failure. Each call to the updateGlobalAggregate() method results in serialized RPC communication with the JobMaster so use with care.

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      <IN,​ACC,​OUT>
      OUT      		 updateGlobalAggregate​(String aggregateName, Object aggregand, org.apache.flink.api.common.functions.AggregateFunction<IN,​ACC,​OUT> aggregateFunction)
      Update the global aggregate and return the new value.

    • Method Detail

      • updateGlobalAggregate

        <IN,​ACC,​OUT> OUT updateGlobalAggregate​(String aggregateName,
                                                   Object aggregand,
                                                   org.apache.flink.api.common.functions.AggregateFunction<IN,​ACC,​OUT> aggregateFunction)
                                            throws IOException
        Update the global aggregate and return the new value.
        Parameters:
        aggregateName - The name of the aggregate to update
        aggregand - The value to add to the aggregate
        aggregateFunction - The function to apply to the current aggregate and aggregand to obtain the new aggregate value
        Returns:
        The updated aggregate
        Throws:
        IOException