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  1. Hadoop Map/Reduce
  2. MAPREDUCE-5962

Support CRC32C in IFile

          Details

          • Type: Improvement
          • Status: Resolved
          • Priority: Major
          • Resolution: Won't Fix
          • Affects Version/s: 2.5.0
          • Fix Version/s: None
          • Component/s: performance, task
          • Labels:
            None

            Description

            Currently, the IFile format used by the MR shuffle checksums all data using the zlib CRC32 polynomial. If we allow use of CRC32C instead, we can get a large reduction in CPU usage by leveraging the native hardware CRC32C implementation (approx half a second of CPU time savings per GB checksummed).

              Attachments

              1. mapreduce-5962.txt
                14 kB
                Todd Lipcon
              2. mapreduce-5962.txt
                14 kB
                Todd Lipcon

                Issue Links

                is related to

                Improvement - An improvement or enhancement to an existing feature or task. HDFS-3528 Use native CRC32 in DFS write path

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

                Improvement - An improvement or enhancement to an existing feature or task. MAPREDUCE-2841 Task level native optimization

                • Major - Major loss of function.
                • Resolved

                Improvement - An improvement or enhancement to an existing feature or task. HADOOP-10859 Native implementation of java Checksum interface

                • Minor - Minor loss of function, or other problem where easy workaround is present.
                • Resolved

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                    • Assignee:
                      tlipcon Todd Lipcon
                      Reporter:
                      tlipcon Todd Lipcon
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                      Dates

                      • Created:
                        Updated:
                        Resolved: