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https://issues.apache.org/jira/browse/HADOOP-15297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16395306#comment-16395306
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Hudson commented on HADOOP-15297:
---------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13812 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/13812/])
HADOOP-15297. Make S3A etag => checksum feature optional. Contributed by
(stevel: rev dd05871b8b57303fe0b0c652e03257b59c191802)
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/Statistic.java
* (edit)
hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/ITestS3AMiscOperations.java
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/Constants.java
* (edit) hadoop-tools/hadoop-aws/src/site/markdown/tools/hadoop-aws/index.md
* (edit)
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AInstrumentation.java
* (edit) hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
> 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
> Fix For: 3.1.0
>
> Attachments: HADOOP-15297-001.patchh, HADOOP-15297-002.patch,
> HADOOP-15297-002.patch, HADOOP-15297-003.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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