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https://issues.apache.org/jira/browse/HADOOP-15224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raphael Azzolini resolved HADOOP-15224.
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Resolution: Fixed
> Add option to set checksum on S3 object uploads
> -----------------------------------------------
>
> Key: HADOOP-15224
> URL: https://issues.apache.org/jira/browse/HADOOP-15224
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.0.0
> Reporter: Steve Loughran
> Assignee: Raphael Azzolini
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.5.0, 3.4.2
>
>
> [~rdblue] reports sometimes he sees corrupt data on S3. Given MD5 checks from
> upload to S3, its likelier to have happened in VM RAM, HDD or nearby.
> If the MD5 checksum for each block was built up as data was written to it,
> and checked against the etag RAM/HDD storage of the saved blocks could be
> removed as sources of corruption
> The obvious place would be
> {{org.apache.hadoop.fs.s3a.S3ADataBlocks.DataBlock}}
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