Packages

package root

Definition Classes: root

package com

Definition Classes: root

package here

Definition Classes: com

package platform

Definition Classes: here

package data

Definition Classes: platform

package processing

This package provides the Data Processing Library for building distributed data processing applications.

A Runner both implements the interface with the environment for an application to run, and starts the application. The application, in turn, is driven by a Driver, that controls and performs the distributed processing.

Choose a Runner best suited for the environment where the application runs.

The Driver performs one of more tasks which read layers from input catalogs and write to one or more layers of an output catalog.

The main entry point in the processing library is the com.here.platform.data.processing.driver.DriverBuilder class where you can add different kinds of tasks to the driver. The driver runs the tasks, and commits the final results to the output catalog.

Tasks are implemented using one or more compilers.

The simplest compiler is the direct compiler which maps each input tile to N output tiles. The application needs to define com.here.platform.data.processing.compiler.Direct1ToNCompiler.

Other more complex compilation patterns are based on some kind of dependency tracking between input partitions and output partitions.

The processing Library supports the following patterns:

- com.here.platform.data.processing.compiler.NonIncrementalCompiler: non-incremental compilation only - com.here.platform.data.processing.compiler.DepCompiler: non-incremental dependency calculation and incremental compilation - com.here.platform.data.processing.compiler.IncrementalDepCompiler: incremental dependency calculation and compilation - com.here.platform.data.processing.compiler.Direct1ToNCompiler: incremental compilation where every output tile depends only on one input tile, and this mapping is independent from tile content - com.here.platform.data.processing.compiler.DirectMToNCompiler: incremental compilation where every output tile depends on multiple input tiles, and this mapping is independent from tile content - com.here.platform.data.processing.compiler.MapGroupCompiler: incremental compilation where every output tile can depend on multiple input tiles, and this mapping depend on the tile content - com.here.platform.data.processing.compiler.RefTreeCompiler: fully-managed two phases incremental compilation that can resolve references between input partitions. Input/Output dependency management is implemented and the developer doesn't need to provide this logic

The application's main object normally mixes in the a runner trait (like PipelineRunner) to setup the Driver, and interfaces with the environment where the application is run. See the Main classes in the example compilers for more details.

com.here.platform.data.processing.catalog, com.here.platform.data.processing.blobstore, and com.here.platform.data.processing.publisher contain utilities for accessing catalogs and payloads in a Spark-friendly way, providing an RDD-based abstraction over data and metadata. These classes are used by the processing library, but can also be used independently.

Definition Classes: data

package compiler

Definition Classes: processing

package direct

Definition Classes: compiler

package mapgroup

Definition Classes: compiler

package reftree

Definition Classes: compiler

CompileOut1To1Fn

CompileOut1ToNFn

CompileOutFn

CompileOutLayerStackFn

IncrementalDepCompiler

NonIncrementalCompiler

com.here.platform.data.processing.compiler

CompileOutFn

trait CompileOutFn[T] extends Serializable

Back-end of DirectMToNCompiler, MapGroupCompiler and RefTreeCompiler. Receives values of a custom type produced by the front-end and produces the final payloads that are the uploaded and committed to the output catalog.

T: the custom type of the values passed between front-end and back-end

Note: The implementation must be scala.Serializable as this is copied to workers and run inside Spark map functions.
,
Users should mix in one of the traits extending this one to their implementation of DirectMToNCompiler, MapGroupCompiler or RefTreeCompiler according to the behaviour wanted.

Linear Supertypes

Serializable, AnyRef, Any

Known Subclasses

CompileOut1To1Fn, CompileOut1ToNFn, CompileOutLayerStackFn, DirectMToNCompiler, MapGroupCompiler, RefTreeCompiler, Direct1ToNCompileOutFnWrapper, MapGroupToRefTreeWrapper1To1, MapGroupToRefTreeWrapper1ToN, MapGroupToRefTreeWrapperBase, ConcreteDirectMToNCompiler, ConcreteDirectMapGroupCompiler, ConcreteRefTreeCompiler, WrapperCompileOut1To1Fn, WrapperCompileOut1ToNFn, WrapperCompileOutFn, WrapperDirectMToNCompiler, WrapperMapGroupCompiler, WrapperRefTreeCompiler

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abstract def compileOutFnDefined(): Unit
Must be overridden as final by all subclasses, to block the mixin of different interfaces in the same compiler class and to assure that at least one child interface is mixed in.
Must be overridden as final by all subclasses, to block the mixin of different interfaces in the same compiler class and to assure that at least one child interface is mixed in.
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CompileOutFn

trait CompileOutFn[T] extends Serializable

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trait CompileOutFn[T] extends Serializable

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CompileOutFn