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https://issues.apache.org/jira/browse/HADOOP-18944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18029824#comment-18029824
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ASF GitHub Bot commented on HADOOP-18944:
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steveloughran merged PR #6203:
URL: https://github.com/apache/hadoop/pull/6203
> s3a openfile is using readahead rather than async drain threshold to
> calculate drain threshold
> ----------------------------------------------------------------------------------------------
>
> Key: HADOOP-18944
> URL: https://issues.apache.org/jira/browse/HADOOP-18944
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/s3
> Affects Versions: 3.3.6
> Reporter: Steve Loughran
> Priority: Minor
> Labels: pull-request-available
>
> we are using the wrong default value for the async drain threshold in
> {{org.apache.hadoop.fs.s3a.impl.OpenFileSupport}}
> {code}
> builderSupport.getPositiveLong(ASYNC_DRAIN_THRESHOLD,
> defaultReadAhead))
> {code}
> this means the drain threshold isn't being taken up in random io unless you
> have a very small readahead
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