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https://issues.apache.org/jira/browse/HADOOP-16133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17120888#comment-17120888
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Steve Loughran commented on HADOOP-16133:
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to fix in HADOOP-16830 by only updating the counters in close() and unbuffer().
if done in the worker thread, it will be correct
> S3A statistic collection underrecords bytes written in helper threads
> ---------------------------------------------------------------------
>
> Key: HADOOP-16133
> URL: https://issues.apache.org/jira/browse/HADOOP-16133
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.1.2
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
>
> Applications collecting per-thread statistics from S3A get underreporting of
> bytes written, as all byte written in the worker call update those in a
> different thread.
> Proposed:
> * the bytes upload statistics are uploaded in the primary thread as a block
> is queued for write, not after in the completion phase in the other thread
> * final {{WriteOperationsHelper.writeSuccessful()}} takes the final
> statistics for its own entertainment
> Really I want context-specific storage statistics.
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