# Package org.apache.nutch.fetcher

package org.apache.nutch.fetcher
The Nutch multi-threaded fetching module

- Class
  Description
  Fetcher
  A queue-based fetcher.
  Fetcher.FetcherReducer
  Reducer that passes through (url, datum) records and merges TDigests from map tasks to set job-level latency percentile counters.
  Fetcher.FetcherRun
  Fetcher.InputFormat
  FetcherOutputFormat
  Splits FetcherOutput entries into multiple map files.
  FetcherThread
  This class picks items from queues and fetches the pages.
  FetcherThreadEvent
  This class is used to capture the various events occurring at fetch time.
  FetcherThreadEvent.PublishEventType
  Type of event to specify start, end or reporting of a fetch item.
  FetcherThreadPublisher
  This class handles the publishing of the events to the queue implementation.
  FetchItem
  This class describes the item to be fetched.
  FetchItemQueue
  This class handles FetchItems which come from the same host ID (be it a proto/hostname or proto/IP pair).
  FetchItemQueues
  A collection of queues that keeps track of the total number of items, and provides items eligible for fetching from any queue.
  QueueFeeder
  This class feeds the queues with input items, and re-fills them as items are consumed by FetcherThread-s.