[ 
https://issues.apache.org/jira/browse/HADOOP-13853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15712269#comment-15712269
 ] 

Steve Loughran commented on HADOOP-13853:
-----------------------------------------

note that given all the other overheads of a commit, this is not the bottleneck.

> 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



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: common-issues-h...@hadoop.apache.org

Reply via email to