Package org.apache.druid.frame.processor

Interface Summary

Interface	Description
FrameProcessor<T>	A FrameProcessor is like an incremental version of Runnable that operates on ReadableFrameChannel and WritableFrameChannel.
OutputChannelFactory	Factory for generating channel pairs for output data from processors.

Class Summary

Class	Description
AwaitAnyWidget	Helper used by FrameProcessorExecutor.runFully(org.apache.druid.frame.processor.FrameProcessor<T>, java.lang.String) when workers return ReturnOrAwait.awaitAny(it.unimi.dsi.fastutil.ints.IntSet).
BlockingQueueOutputChannelFactory	An OutputChannelFactory that generates BlockingQueueFrameChannel.
Bouncer	Limiter for access to some resource.
FileOutputChannelFactory	An OutputChannelFactory that generates WritableFrameFileChannel backed by FrameFileWriter.
FrameChannelBatcher	Processor that reads up to "maxFrames" frames from some input channels and combines them into a batch.
FrameChannelMerger	Processor that merges already-sorted inputChannels and writes a fully-sorted stream to a single outputChannel.
FrameChannelMuxer	Processor that merges frames from inputChannels into a single outputChannel.
FrameProcessorExecutor	Manages execution of FrameProcessor in an ExecutorService.
FrameProcessors
MultiColumnSelectorFactory	A ColumnSelectorFactory that wraps multiple ColumnSelectorFactory and delegates to one of them at any given time.
OutputChannel	Represents an output channel for some frame processor.
OutputChannels	A list of OutputChannel.
ReturnOrAwait<T>	Instances of this class are returned by FrameProcessor.runIncrementally(it.unimi.dsi.fastutil.ints.IntSet), and are used by FrameProcessorExecutor to manage execution.
RunAllFullyWidget<T,ResultType>	Helper for FrameProcessorExecutor.runAllFully(org.apache.druid.java.util.common.guava.Sequence<? extends org.apache.druid.frame.processor.FrameProcessor<T>>, ResultType, java.util.function.BiFunction<ResultType, T, ResultType>, int, org.apache.druid.frame.processor.Bouncer, java.lang.String).
SuperSorter	Sorts and partitions a dataset using parallel external merge sort.
SuperSorterProgressSnapshot	Like SuperSorterProgressTracker, but immutable.
SuperSorterProgressTracker	A thread-safe class that keeps track of the progress of an n-way, multilevel merge sort.

Exception Summary

Exception	Description
FrameRowTooLargeException	Exception that is conventionally thrown by workers when they call FrameWriter.addSelection() and it returns false on an empty frame, or in a situation where allocating a new frame is impractical.