Steve Loughran created HADOOP-13853:
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Summary: S3ADataBlocks.DiskBlock to lazy create dest file for
faster 0-byte puts
Key: HADOOP-13853
URL: https://issues.apache.org/jira/browse/HADOOP-13853
Project: Hadoop Common
Issue Type: Sub-task
Components: fs/s3
Affects Versions: 2.8.0
Reporter: Steve Loughran
Priority: Minor
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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