Package com.google.appengine.tools.mapreduce

Interface Summary

Interface	Description
Context	MapReduce context.
Counter	Counter is an integer variable that is aggregated across multiple shards.
Counters	Collection of all counters.
MapOnlyMapperContext<O>	Context for MapOnlyMapper execution.
MapperContext<K,V>	A context for mapper execution.
MapReduceResult<R>	Result of a MapReduceJob or MapJob.
ReducerContext<O>	Context for Reducer execution.
ShardContext	Context for each shard.
Sharder	Used to determine which shard an item belongs to.
WorkerContext<O>	Context for each worker (mapper or reducer) shard.

Class Summary

Class	Description
BigQueryMarshaller<T>	An implementation of this class should serialize the objects of type T into newline separated json as expected by the bigquery load jobs.
CounterNames	Built-in counter names.
DatastoreMutationPool	DatastoreMutationPool allows you to pool datastore operations such that they are applied in batches, requiring fewer datastore API calls.
DatastoreMutationPool.Params	DatastoreMutationPool params.
DatastoreMutationPool.Params.Builder	DatastoreMutationPool Params builder.
GoogleCloudStorageFileSet	An ordered list of files in GCS.
Input<I>	Input is the data source specification for the job.
InputReader<I>	Reads data from an input source.
KeyValue<K,V>	Key-value pair.
MapJob<I,O,R>	A Pipeline job that runs a map jobs.
MapOnlyMapper<I,O>	Map function for Map only jobs.
Mapper<I,K,V>	Map function for MapReduce computations.
MapReduceJob<I,K,V,O,R>	A Pipeline job that runs a MapReduce.
MapReduceServlet	Servlet for all MapReduce API related functions.
MapReduceSettings	Settings that affect how a MapReduce is executed.
MapReduceSettings.Builder
MapReduceSpecification<I,K,V,O,R>	Specification for a MapReduce job.
MapReduceSpecification.Builder<I,K,V,O,R>
MapSettings	Settings that affect how a Map job is executed.
MapSettings.Builder
MapSpecification<I,O,R>	Specification for a map-only job.
MapSpecification.Builder<I,O,R>
Marshaller<T>	Turns objects of type T into bytes and back.
Marshallers	Some Marshallers and related utilities.
Output<O,R>	Defines where output should go.
OutputWriter<O>	Writes key-value pairs.
Reducer<K,V,O>	Reduce function for use in MapReduce.
ReducerInput<V>	Enumerates the reducer's input values for a given key.
Worker<C extends WorkerContext<?>>	Base class for Mapper and Reducer.

Enum Summary

Enum	Description
BigQueryFieldMode	The supported bigquery field modes.

Exception Summary

Exception	Description
CorruptDataException	The exception generated if any of the data appears to be corrupt.
MapReduceJobException	An exception that is thrown upon MapReduceJob failure.

Annotation Types Summary

Annotation Type	Description
BigQueryDataField	Annotation to provide additional information related to BigQuery data fields.
BigQueryIgnore	A annotation for fields that should not be part of the bigquery output.