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https://issues.apache.org/jira/browse/HADOOP-15297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16392866#comment-16392866
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genericqa commented on HADOOP-15297:
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|| Subsystem || Report/Notes ||
| JIRA Issue | HADOOP-15297 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12913782/HADOOP-15297-002.patch
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| Console output |
https://builds.apache.org/job/PreCommit-HADOOP-Build/14290/console |
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> Make S3A etag => checksum feature optional
> ------------------------------------------
>
> 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-15297-002.patch
>
>
> 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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