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From "Aaron Fabbri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13345) S3Guard: Improved Consistency for S3A
Date Thu, 05 Jan 2017 02:01:01 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15799997#comment-15799997
] 

Aaron Fabbri commented on HADOOP-13345:
---------------------------------------

Thanks for your input [~liuml07].  The reason I propose doing the retry logic after merge
is:

1. It will change S3AFileSystem code significantly.  At least in terms of dealing with merge
conflicts, things like putting a function inside a retry loop (increasing the indent of all
the code) might mean a good amount of code churn.

2. I'm not sure retries are needed for basic list consistency.  The failure injection test
I added demonstrates that basic listing consistency works.  Since most S3 GETs are consistent,
I would expect use cases like PUT, list, GET to work as is.

Let me know if I'm missing something.  Looking forward to others' opinions too.  Cheers!



> S3Guard: Improved Consistency for S3A
> -------------------------------------
>
>                 Key: HADOOP-13345
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13345
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs/s3
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>         Attachments: HADOOP-13345.prototype1.patch, S3C-ConsistentListingonS3-Design.pdf,
S3GuardImprovedConsistencyforS3A.pdf, S3GuardImprovedConsistencyforS3AV2.pdf, s3c.001.patch
>
>
> This issue proposes S3Guard, a new feature of S3A, to provide an option for a stronger
consistency model than what is currently offered.  The solution coordinates with a strongly
consistent external store to resolve inconsistencies caused by the S3 eventual consistency
model.



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