[jira] [Created] (HADOOP-18944) s3a openfile is using readahead rather than async drain threshold to calculate drain threshold

[Steve Loughran (Jira)]

Steve Loughran created HADOOP-18944:
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             Summary: 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


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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