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Posted to hdfs-dev@hadoop.apache.org by "Colin Patrick McCabe (JIRA)" <ji...@apache.org> on 2014/10/01 20:38:35 UTC
[jira] [Reopened] (HDFS-4697) short-circuit reads do not honor
readahead settings
[ https://issues.apache.org/jira/browse/HDFS-4697?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Colin Patrick McCabe reopened HDFS-4697:
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> 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
> Components: hdfs-client
> Affects Versions: 2.0.3-alpha
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Priority: Minor
> Fix For: 2.3.0
>
>
> 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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