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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 blobstore

Contains an abstract interface used to access BlobStore.

Obtain the retriever and uploader for a catalog directly from the com.here.platform.data.processing.catalog.Catalog instance.

Definition Classes: processing

package caching

Definition Classes: blobstore

object CachingRetriever extends Serializable

Definition Classes: caching

RetrieverWrapper

com.here.platform.data.processing.blobstore.caching.CachingRetriever

RetrieverWrapper

implicit final class RetrieverWrapper extends AnyVal

Augments the Retriever class with a method to build a cached version of it.

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new RetrieverWrapper(retriever: Retriever)
retriever
The wrapped retriever.

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def caching(filter: CacheFilter = noFilter, factory: CacheFactory[Payload] = defaultCacheFactory, statistics: Option[Statistics] = None): Retriever
Creates a new CachingRetriever from retriever.
Creates a new CachingRetriever from retriever.
filter
A predicate used to cache only the partitions for which the predicate returns true. If not specified, all partitions are cached.
factory
A functions that returns a com.here.platform.data.processing.utils.cache.Cache. If not specified com.here.platform.data.processing.utils.cache.GuavaCache.cacheFactory is used.
statistics
An optional com.here.platform.data.processing.statistics.Statistics object. If defined, statistics about the number of cache requests and misses are recorded.
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val retriever: Retriever
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