Uploaded image for project: 'Hadoop Map/Reduce'
  1. Hadoop Map/Reduce
  2. MAPREDUCE-598

Streaming: better conrol over input splits

    XMLWordPrintableJSON

Details

    • Improvement
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • None
    • contrib/streaming
    • None

    Description

      In steaming, the map command usually expect to receive it's input uninterpreted – just as it is stored in DFS.
      However, the split (the beginning and the end of the portion of data that goes to a single map task) is often important and is not "any line break".
      Often the input consists of multi-line docments – e.g. in XML.

      There should be a way to specify a pattern that separates logical records.
      Existing "Streaming XML record reader" kind of provides this functionality. However, it is accepted that "Streaming XML" is a hack and needs to be replaced

      Attachments

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MAPREDUCE-606 Implement a binary input/output format for Streaming

          • Major - Major loss of function.
          • Resolved

          New Feature - A new feature of the product, which has yet to be developed. MAPREDUCE-5018 Support raw binary data with Hadoop streaming

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Patch Available

          Improvement - An improvement or enhancement to an existing feature or task. HADOOP-3341 make key-value separators in hadoop streaming fully configurable

          • Major - Major loss of function.
          • Closed

          Activity

            People

              Unassigned Unassigned
              arkady arkady borkovsky
              Votes:
              0 Vote for this issue
              Watchers:
              1 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: