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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13853) S3ADataBlocks.DiskBlock to lazy create dest file for faster 0-byte puts
Date Mon, 12 Feb 2018 15:30:03 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HADOOP-13853:
------------------------------------
    Parent: HADOOP-15220  (was: HADOOP-14831)

> 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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