Hadoop Map/Reduce
  1. Hadoop Map/Reduce
  2. MAPREDUCE-987

Exposing MiniDFS and MiniMR clusters as a single process command-line

    Details

    • Type: New Feature New Feature
    • Status: Closed
    • Priority: Minor Minor
    • Resolution: Fixed
    • Affects Version/s: 1.2.0, 2.0.2-alpha
    • Fix Version/s: 1.2.0, 2.0.2-alpha
    • Component/s: build, test
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      It's hard to test non-Java programs that rely on significant mapreduce functionality. The patch I'm proposing shortly will let you just type "bin/hadoop jar hadoop-hdfs-hdfswithmr-test.jar minicluster" to start a cluster (internally, it's using Mini

      {MR,HDFS}

      Cluster) with a specified number of daemons, etc. A test that checks how some external process interacts with Hadoop might start minicluster as a subprocess, run through its thing, and then simply kill the java subprocess.

      I've been using just such a system for a couple of weeks, and I like it. It's significantly easier than developing a lot of scripts to start a pseudo-distributed cluster, and then clean up after it. I figure others might find it useful as well.

      I'm at a bit of a loss as to where to put it in 0.21. hdfs-with-mr tests have all the required libraries, so I've put it there. I could conceivably split this into "minimr" and "minihdfs", but it's specifically the fact that they're configured to talk to each other that I like about having them together. And one JVM is better than two for my test programs.

      1. HDFS-621.patch
        11 kB
        Philip Zeyliger
      2. HDFS-621-0.20-patch
        10 kB
        Philip Zeyliger
      3. MAPREDUCE-987.patch
        10 kB
        Philip Zeyliger
      4. MAPREDUCE-987.patch
        12 kB
        Ahmed Radwan
      5. MAPREDUCE-987_branch-1.0.patch
        11 kB
        Ahmed Radwan
      6. MAPREDUCE-987_rev2.patch
        12 kB
        Ahmed Radwan
      7. MAPREDUCE-987_rev3.patch
        17 kB
        Ahmed Radwan
      8. MAPREDUCE-987_rev4.patch
        17 kB
        Ahmed Radwan
      9. MAPREDUCE-987_branch-1.0_rev2.patch
        17 kB
        Ahmed Radwan

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            • Assignee:
              Ahmed Radwan
              Reporter:
              Philip Zeyliger
            • Votes:
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              Dates

              • Created:
                Updated:
                Resolved:

                Development