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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15297) Make s3a etag -> checksum publishing option
Date Wed, 07 Mar 2018 21:36:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16390281#comment-16390281

Steve Loughran commented on HADOOP-15297:

HADOOP-15297 patch 001
* make etag feature optional, disabled by default
* update tests to check both states
* update docs
* also update instrumentation to track invocations. Not directly used, but useful for anything
downstream trying to track the #of calls made

Testing: S3 ireland, also did the mvn site:site to verify the updated docs were valid.

> Make s3a etag -> checksum publishing option
> -------------------------------------------
>                 Key: HADOOP-15297
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15297
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.1.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Blocker
>         Attachments: HADOOP-15297-001.patchh
> HADOOP-15273 shows how distcp doesn't handle non-HDFS filesystems with checksums.
> Exposing Etags as checksums, HADOOP-13282, breaks workflows which back up to s3a.
> Rather than revert  I want to make it an option, off by default. Once we are happy with
distcp in future, we can turn it on.
> Why an option? Because it lines up for a successor to distcp which saves src and dest
checksums to a file and can then verify whether or not files have really changed. Currently
distcp relies on dest checksum algorithm being the same as the src for incremental updates,
but if either of the stores don't serve checksums, silently downgrades to not checking. 

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