Colin Patrick McCabe created HDFS-4697:
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Summary: short-circuit reads do not honor readahead settings
Key: HDFS-4697
URL: https://issues.apache.org/jira/browse/HDFS-4697
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Colin Patrick McCabe
Priority: Minor
Neither the new nor the legacy short-circuit read implementations honor
{{dfs.datanode.readahead.bytes}}. This can result in scenarios where
non-short-circuit reads are faster for long reads, simply because they are
doing more readahead, and SCR is not. We should do readahead in both cases if
it is configured.
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