Package org.apache.flink.streaming.runtime.tasks

This package contains classes that realize streaming tasks.

See: Description

Class Summary

Class	Description
OneInputStreamTask<IN,OUT>
OperatorChain<OUT>
SourceStreamTask<OUT>	Task for executing streaming sources.
StreamIterationHead<OUT>
StreamIterationTail<IN>
StreamTask<OUT,Operator extends StreamOperator<OUT>>	Base class for all streaming tasks.
StreamTaskState	The state checkpointed by a AbstractStreamOperator.
StreamTaskStateList	List of task states for a chain of streaming tasks.
TwoInputStreamTask<IN1,IN2,OUT>

Exception Summary

Exception	Description
ExceptionInChainedOperatorException	A special exception that signifies that the cause exception came from a chained operator.
StreamTaskException	An exception that is thrown by the stream vertices when encountering an illegal condition.
TimerException	RuntimeException for wrapping exceptions that are thrown in the timer callback of the timer service in StreamTask.

Package org.apache.flink.streaming.runtime.tasks Description

This package contains classes that realize streaming tasks. These tasks are executable stream consumers and producers that are scheduled by the distributed dataflow runtime. Each task occupies one execution slot and is run with by an executing thread.

The tasks merely set up the distributed stream coordination and the checkpointing. Internally, the tasks create one or more operators, perform the stream transformations.