Uploaded image for project: 'Hive'
  1. Hive
  2. HIVE-1343

add an interface in RCFile to support concatenation of two files without (de)compression

    Details

    • Type: New Feature
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.6.0
    • Fix Version/s: 0.8.0
    • Labels:
      None

      Description

      If two files are concatenated, we need to read each record in these files and write them back to the destination file. The IO cost is mostly unavoidable due to the lack of append functionality in HDFS. However the CPU cost could be significantly reduced by avoiding compression and decompression of the files.

      The File Format layer should provide API that implement the block-level concatenation.

        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                he yongqiang He Yongqiang
                Reporter:
                nzhang Ning Zhang
              • Votes:
                0 Vote for this issue
                Watchers:
                2 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: