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https://issues.apache.org/jira/browse/HADOOP-17250?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mukund Thakur resolved HADOOP-17250.
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Resolution: Fixed
> ABFS: Random read perf improvement
> ----------------------------------
>
> Key: HADOOP-17250
> URL: https://issues.apache.org/jira/browse/HADOOP-17250
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/azure
> Affects Versions: 3.3.0
> Reporter: Sneha Vijayarajan
> Assignee: Mukund Thakur
> Priority: Major
> Labels: abfsactive, pull-request-available
> Fix For: 3.3.2
>
> Time Spent: 5h 10m
> Remaining Estimate: 0h
>
> Random read if marginally read ahead was seen to improve perf for a TPCH
> query.
>
> Introducing fs.azure.readahead.range parameter which can be set by user.
> Data will be populated in buffer for random reads as well which leads to
> lesser
> remote calls.
> This patch also changes the seek implementation to perform a lazy seek. Actual
> seek is done when a read is initiated and data is not present in buffer else
> date is returned from buffer thus reducing the number of remote calls.
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