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

This package contains classes that realize streaming tasks.

See: Description

Class Summary

Class	Description
DefaultTimeServiceProvider	A TimeServiceProvider which assigns as current processing time the result of calling System.currentTimeMillis() and registers timers using a ScheduledThreadPoolExecutor.
OneInputStreamTask<IN,OUT>
OperatorChain<OUT>	The OperatorChain contains all operators that are executed as one chain within a single StreamTask.
SourceStreamTask<OUT,SRC extends SourceFunction<OUT>,OP extends StreamSource<OUT,SRC>>	Task for executing streaming sources.
StoppableSourceStreamTask<OUT,SRC extends SourceFunction<OUT> & org.apache.flink.api.common.functions.StoppableFunction>	Stoppable task for executing stoppable 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.
TestTimeServiceProvider	This is a TimeServiceProvider used strictly for testing the processing time functionality.
TimeServiceProvider	Defines the current processing time and handles all related actions, such as register timers for tasks to be executed in the future.
TwoInputStreamTask<IN1,IN2,OUT>

Exception Summary

Exception	Description
AsynchronousException	RuntimeException for wrapping exceptions that are thrown in Threads that are not the main compute Thread.
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.