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https://issues.apache.org/jira/browse/HADOOP-16445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16912592#comment-16912592
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Siddharth Seth commented on HADOOP-16445:
-----------------------------------------

Have posted a PR.

On the STS question - at the moment, it is going to end up using the existing 
configuration parameter - i.e. fs.s3a.signing-algorithm - and the overrides for 
S3A/DDB will not have an affect on this. I could add an override for STS as 
well if that makes sense.

For STS - if fs.s3a.signing-algorithm is not set, the signer is not overridden.
For S3 - If fs.s3a.s3.signing-algorithm is set - the signer is overriden with 
this value. Otherwise the existing behaviour continues (similar to what is 
decsribed for STS above)
For DDB -  If fs.s3a.ddb.signing-algorithm is set - the signer is overriden 
with this value. Otherwise the existing behaviour continues (similar to what is 
decsribed for STS above)

> Allow separate custom signing algorithms for S3 and DDB
> -------------------------------------------------------
>
>                 Key: HADOOP-16445
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16445
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/s3
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>            Priority: Major
>         Attachments: HADOOP-16445.01.patch, HADOOP-16445.02.patch
>
>
> fs.s3a.signing-algorithm allows overriding the signer. This applies to both 
> the S3 and DDB clients. Need to be able to specify separate signing algorithm 
> overrides for S3 and DDB.
>  



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