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https://issues.apache.org/jira/browse/HADOOP-13786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HADOOP-13786:
------------------------------------
    Attachment: HADOOP-13786-HADOOP-13345-006.patch

Patch 006

# make sure that after a multipart put is completed, the metastore is told
# a bit more diagnostics on why a test is only failing on s3guard local
# added writehelper allows caller to delete a file and not ask for any parent 
dir to be optionally created. This will allow for a faster scan & commit of all 
files in a directory tree, after which the tree gets deleted anyway. This is 
not yet activated.
# Fixes findbugs reports (some were real!); javac, javadoc, many of the 
checkstyle.

> Add S3Guard committer for zero-rename commits to consistent S3 endpoints
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-13786
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13786
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs/s3
>    Affects Versions: HADOOP-13345
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>         Attachments: HADOOP-13786-HADOOP-13345-001.patch, 
> HADOOP-13786-HADOOP-13345-002.patch, HADOOP-13786-HADOOP-13345-003.patch, 
> HADOOP-13786-HADOOP-13345-004.patch, HADOOP-13786-HADOOP-13345-005.patch, 
> HADOOP-13786-HADOOP-13345-006.patch
>
>
> A goal of this code is "support O(1) commits to S3 repositories in the 
> presence of failures". Implement it, including whatever is needed to 
> demonstrate the correctness of the algorithm. (that is, assuming that s3guard 
> provides a consistent view of the presence/absence of blobs, show that we can 
> commit directly).
> I consider ourselves free to expose the blobstore-ness of the s3 output 
> streams (ie. not visible until the close()), if we need to use that to allow 
> us to abort commit operations.



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