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 sued 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

Modifier and Type	Method and 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