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  1. Hadoop Map/Reduce
  2. MAPREDUCE-2841

Task level native optimization

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 3.0.0-alpha1
    • Component/s: task
    • Labels:
      None
    • Environment:

      x86-64 Linux/Unix

    • Hadoop Flags:
      Reviewed
    • Release Note:
      Hide
      Adds a native implementation of the map output collector. The native library will build automatically with -Pnative. Users may choose the new collector on a job-by-job basis by setting mapreduce.job.map.output.collector.class=org.apache.hadoop.mapred.
      nativetask.NativeMapOutputCollectorDelegator in their job configuration. For shuffle-intensive jobs this may provide speed-ups of 30% or more.
      Show
      Adds a native implementation of the map output collector. The native library will build automatically with -Pnative. Users may choose the new collector on a job-by-job basis by setting mapreduce.job.map.output.collector.class=org.apache.hadoop.mapred. nativetask.NativeMapOutputCollectorDelegator in their job configuration. For shuffle-intensive jobs this may provide speed-ups of 30% or more.
    • Tags:
      optimization task

      Description

      I'm recently working on native optimization for MapTask based on JNI.

      The basic idea is that, add a NativeMapOutputCollector to handle k/v pairs emitted by mapper, therefore sort, spill, IFile serialization can all be done in native code, preliminary test(on Xeon E5410, jdk6u24) showed promising results:

      1. Sort is about 3x-10x as fast as java(only binary string compare is supported)

      2. IFile serialization speed is about 3x of java, about 500MB/s, if hardware CRC32C is used, things can get much faster(1G/

      3. Merge code is not completed yet, so the test use enough io.sort.mb to prevent mid-spill

      This leads to a total speed up of 2x~3x for the whole MapTask, if IdentityMapper(mapper does nothing) is used

      There are limitations of course, currently only Text and BytesWritable is supported, and I have not think through many things right now, such as how to support map side combine. I had some discussion with somebody familiar with hive, it seems that these limitations won't be much problem for Hive to benefit from those optimizations, at least. Advices or discussions about improving compatibility are most welcome

      Currently NativeMapOutputCollector has a static method called canEnable(), which checks if key/value type, comparator type, combiner are all compatible, then MapTask can choose to enable NativeMapOutputCollector.

      This is only a preliminary test, more work need to be done. I expect better final results, and I believe similar optimization can be adopt to reduce task and shuffle too.

        Attachments

        1. DESIGN.html
          42 kB
          Binglin Chang
        2. dualpivot-0.patch
          5 kB
          Christopher Douglas
        3. dualpivotv20-0.patch
          4 kB
          Christopher Douglas
        4. fb-shuffle.patch
          76 kB
          Todd Lipcon
        5. hadoop-3.0-mapreduce-2841-2014-7-17.patch
          3.50 MB
          Sean Zhong
        6. MAPREDUCE-2841.v1.patch
          180 kB
          Binglin Chang
        7. MAPREDUCE-2841.v2.patch
          190 kB
          Binglin Chang
        8. micro-benchmark.txt
          13 kB
          Todd Lipcon
        9. MR-2841benchmarks.pdf
          213 kB
          Todd Lipcon
        10. mr-2841-merge.txt
          2.72 MB
          Todd Lipcon
        11. mr-2841-merge-2.txt
          2.70 MB
          Sean Zhong
        12. mr-2841-merge-3.patch
          2.73 MB
          Sean Zhong
        13. mr-2841-merge-4.patch
          2.68 MB
          Sean Zhong

        Issue Links

        1.
        Allow specifying multiple MapOutputCollectors with fallback Sub-task Closed Todd Lipcon Actions
        2.
        Fix native-task build on Ubuntu 13.10 Sub-task Resolved Todd Lipcon Actions
        3.
        native-task should not fail to build if snappy is missing Sub-task Resolved Sean Zhong Actions
        4.
        Fix or suppress native-task gcc warnings Sub-task Resolved Manu Zhang Actions
        5.
        native-task CompressTest failure on Ubuntu Sub-task Resolved Manu Zhang Actions
        6.
        native-task: reuse lz4 sources in hadoop-common Sub-task Resolved Binglin Chang Actions
        7.
        native-task: Fix build on macosx Sub-task Resolved Binglin Chang Actions
        8.
        native-task: Unit test TestGlibCBug fails on ubuntu Sub-task Resolved Sean Zhong Actions
        9.
        native-task should not run unit tests if native profile is not enabled Sub-task Resolved Binglin Chang Actions
        10.
        native-task test logs should not write to console Sub-task Open Unassigned Actions
        11.
        native-task: simplify/remove dead code Sub-task Resolved Unassigned Actions
        12.
        native-task: TestBytesUtil fails Sub-task Resolved Todd Lipcon Actions
        13.
        native-task: revert changes which expose Text internals Sub-task Resolved Todd Lipcon Actions
        14.
        native-task: Rename system tests into standard directory layout Sub-task Resolved Todd Lipcon Actions
        15.
        native-task: Use DirectBufferPool from Hadoop Common Sub-task Resolved Todd Lipcon Actions
        16.
        native-task: Simplify ByteBufferDataReader/Writer Sub-task Resolved Todd Lipcon Actions
        17.
        native-task should not fail to build if zlib is missing Sub-task Resolved Unassigned Actions
        18.
        native-task: fix some valgrind errors Sub-task Resolved Binglin Chang Actions
        19.
        native-task: add native tests to maven and fix bug in pom.xml Sub-task Resolved Binglin Chang Actions
        20.
        native-task: fix native library distribution Sub-task Resolved Manu Zhang Actions
        21.
        native-task: fix logging Sub-task Resolved Manu Zhang Actions
        22.
        native-task: sources/test-sources jar distribution Sub-task Resolved Manu Zhang Actions
        23.
        native-task: speed up test runs Sub-task Resolved Todd Lipcon Actions
        24.
        native-task: findbugs, interface annotations, and other misc cleanup Sub-task Resolved Todd Lipcon Actions
        25.
        nativetask: move system test working dir to target dir and cleanup test config xml files Sub-task Resolved Manu Zhang Actions
        26.
        native-task: KVTest and LargeKVTest should check mr job is sucessful Sub-task Resolved Binglin Chang Actions
        27.
        native-task: warnings about illegal Progress values Sub-task Resolved Manu Zhang Actions
        28.
        native-task: fix some counter issues Sub-task Resolved Binglin Chang Actions
        29.
        native-task: Style fixups and dead code removal Sub-task Resolved Todd Lipcon Actions
        30.
        native-task: fix release audit, javadoc, javac warnings Sub-task Resolved Todd Lipcon Actions
        31.
        Remove CustomModule examples in nativetask Sub-task Resolved Sean Zhong Actions
        32.
        native-task: fix gtest build on macosx Sub-task Resolved Binglin Chang Actions

          Activity

            People

            • Assignee:
              clockfly Sean Zhong
              Reporter:
              decster Binglin Chang

              Dates

              • Created:
                Updated:
                Resolved:

                Issue deployment