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https://issues.apache.org/jira/browse/HADOOP-16132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16780899#comment-16780899
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Hadoop QA commented on HADOOP-16132:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 6s{color}
| {color:red} HADOOP-16132 does not apply to trunk. Rebase required? Wrong
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HADOOP-16132 |
| Console output |
https://builds.apache.org/job/PreCommit-HADOOP-Build/15999/console |
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This message was automatically generated.
> Support multipart download in S3AFileSystem
> -------------------------------------------
>
> Key: HADOOP-16132
> URL: https://issues.apache.org/jira/browse/HADOOP-16132
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Reporter: Justin Uang
> Priority: Major
> Attachments: HADOOP-16132.001.patch, seek-logs-parquet.txt
>
>
> I noticed that I get 150MB/s when I use the AWS CLI
> {code:java}
> aws s3 cp s3://<bucket>/<key> - > /dev/null{code}
> vs 50MB/s when I use the S3AFileSystem
> {code:java}
> hadoop fs -cat s3://<bucket>/<key> > /dev/null{code}
> Looking into the AWS CLI code, it looks like the
> [download|https://github.com/boto/s3transfer/blob/ca0b708ea8a6a1213c6e21ca5a856e184f824334/s3transfer/download.py]
> logic is quite clever. It downloads the next couple parts in parallel using
> range requests, and then buffers them in memory in order to reorder them and
> expose a single contiguous stream. I translated the logic to Java and
> modified the S3AFileSystem to do similar things, and am able to achieve
> 150MB/s download speeds as well. It is mostly done but I have some things to
> clean up first. The PR is here:
> https://github.com/palantir/hadoop/pull/47/files
> It would be great to get some other eyes on it to see what we need to do to
> get it merged.
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