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  1. Hadoop HDFS
  2. HDFS-2834

ByteBuffer-based read API for DFSInputStream

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 2.0.2-alpha
    • hdfs-client, performance
    • None
    • Reviewed

    Description

      The DFSInputStream read-path always copies bytes into a JVM-allocated byte[]. Although for many clients this is desired behaviour, in certain situations, such as native-reads through libhdfs, this imposes an extra copy penalty since the byte[] needs to be copied out again into a natively readable memory area.

      For these cases, it would be preferable to allow the client to supply its own buffer, wrapped in a ByteBuffer, to avoid that final copy overhead.

      Attachments

        1. HDFS-2834.11.patch
          60 kB
          Henry Robinson
        2. HDFS-2834.10.patch
          48 kB
          Henry Robinson
        3. HDFS-2834.9.patch
          49 kB
          Henry Robinson
        4. HDFS-2834.8.patch
          61 kB
          Henry Robinson
        5. HDFS-2834.7.patch
          61 kB
          Henry Robinson
        6. hdfs-2834-libhdfs-benchmark.png
          43 kB
          Henry Robinson
        7. HDFS-2834.6.patch
          59 kB
          Henry Robinson
        8. HDFS-2834.5.patch
          59 kB
          Henry Robinson
        9. HDFS-2834.4.patch
          58 kB
          Henry Robinson
        10. HDFS-2834.3.patch
          63 kB
          Henry Robinson
        11. HDFS-2834-no-common.patch
          60 kB
          Henry Robinson
        12. HDFS-2834.patch
          64 kB
          Henry Robinson
        13. HDFS-2834.patch
          66 kB
          Henry Robinson

        Issue Links

          breaks

          Bug - A problem which impairs or prevents the functions of the product. HDFS-3243 TestParallelRead timing out on jenkins

          • Major - Major loss of function.
          • Closed
          depends upon

          New Feature - A new feature of the product, which has yet to be developed. HADOOP-8135 Add ByteBufferReadable interface to FSDataInputStream

          • Major - Major loss of function.
          • Closed
          is depended upon by

          Improvement - An improvement or enhancement to an existing feature or task. HDFS-3110 libhdfs implementation of direct read API

          • Major - Major loss of function.
          • Closed
          is related to

          Bug - A problem which impairs or prevents the functions of the product. HBASE-8143 HBase on Hadoop 2 with local short circuit reads (ssr) causes OOM

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          New Feature - A new feature of the product, which has yet to be developed. HDFS-3053 Support for true zero-copy (mmap-based) reads

          • Major - Major loss of function.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. HDFS-3051 A zero-copy ScatterGatherRead api from FSDataInputStream

          • Major - Major loss of function.
          • Open

          Improvement - An improvement or enhancement to an existing feature or task. HBASE-21879 Read HFile's block to ByteBuffer directly instead of to byte for reducing young gc purpose

          • Major - Major loss of function.
          • Closed
          relates to

          New Feature - A new feature of the product, which has yet to be developed. HADOOP-8148 Zero-copy ByteBuffer-based compressor / decompressor API

          • Major - Major loss of function.
          • Open

          Improvement - An improvement or enhancement to an existing feature or task. HDFS-15693 Improve native code's performance when writing to HDFS

          • Major - Major loss of function.
          • Open

          Improvement - An improvement or enhancement to an existing feature or task. HDFS-3246 pRead equivalent for direct read path

          • Major - Major loss of function.
          • Resolved

          Activity

            People

              henryr Henry Robinson
              henryr Henry Robinson
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              Dates

                Created:
                Updated:
                Resolved: