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  1. Hadoop Common
  2. HADOOP-15220 Über-jira: S3a phase V: Hadoop 3.2 features
  3. HADOOP-13853

S3ADataBlocks.DiskBlock to lazy create dest file for faster 0-byte puts

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Details

    • Sub-task
    • Status: Resolved
    • Minor
    • Resolution: Won't Fix
    • 2.8.0
    • None
    • fs/s3
    • None

    Description

      Looking at traces of work, there's invariably a PUT of a _SUCCESS at the end, which, with disk output, adds the overhead of creating, writing to and then reading a 0 byte file.

      With a lazy create, the creation could be postponed until the first write, with special handling in the startUpload() operation to return a null stream, rather than reopen the file. Saves on some disk IO: create, read, delete

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          is related to

          Sub-task - The sub-task of the issue HADOOP-13293 add a special 0 byte input stream for empty blobs

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

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              Unassigned Unassigned
              stevel@apache.org Steve Loughran
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                Created:
                Updated:
                Resolved: