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https://issues.apache.org/jira/browse/HADOOP-13028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15281102#comment-15281102
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Colin Patrick McCabe commented on HADOOP-13028:
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That's a good point, [~cnauroth]. I guess as long as people don't start
treating this output as a stable API, it's reasonable to have debugging
information there. Can we add a comment to toString stating that this output
is not stable API and should not be parsed? +1 once that is done.
Thanks for working on this, [~steve_l]... it's going to be very helpful for
running Hadoop on s3.
> add low level counter metrics for S3A; use in read performance tests
> --------------------------------------------------------------------
>
> Key: HADOOP-13028
> URL: https://issues.apache.org/jira/browse/HADOOP-13028
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3, metrics
> Affects Versions: 2.8.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Attachments: HADOOP-13028-001.patch, HADOOP-13028-002.patch,
> HADOOP-13028-004.patch, HADOOP-13028-005.patch, HADOOP-13028-006.patch,
> HADOOP-13028-007.patch, HADOOP-13028-008.patch, HADOOP-13028-009.patch,
> HADOOP-13028-branch-2-008.patch, HADOOP-13028-branch-2-009.patch,
> HADOOP-13028-branch-2-010.patch, HADOOP-13028-branch-2-011.patch,
> org.apache.hadoop.fs.s3a.scale.TestS3AInputStreamPerformance-output.txt,
> org.apache.hadoop.fs.s3a.scale.TestS3AInputStreamPerformance-output.txt
>
>
> against S3 (and other object stores), opening connections can be expensive,
> closing connections may be expensive (a sign of a regression).
> S3A FS and individual input streams should have counters of the # of
> open/close/failure+reconnect operations, timers of how long things take. This
> can be used downstream to measure efficiency of the code (how often
> connections are being made), connection reliability, etc.
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