Hive
  1. Hive
  2. HIVE-1343

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

    Details

    • Type: New Feature New Feature
    • Status: Closed
    • Priority: Major 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.

        Issue Links

          Activity

            People

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

              Dates

              • Created:
                Updated:
                Resolved:

                Development