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https://issues.apache.org/jira/browse/HBASE-10052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13834203#comment-13834203
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Colin Patrick McCabe commented on HBASE-10052:
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[[email protected]] : sorry. I did mean DFSInputStream, since the
files not being used again would be the compactees. And yeah, reflection would
be a good way to do this and support older Hadoops (see {{CanSetDropBehind}}
interface)
> use HDFS advisory caching to avoid caching HFiles that are not going to be
> read again (because they are being compacted)
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-10052
> URL: https://issues.apache.org/jira/browse/HBASE-10052
> Project: HBase
> Issue Type: Improvement
> Reporter: Colin Patrick McCabe
>
> HBase can benefit from doing dropbehind during compaction since compacted
> files are not read again. HDFS advisory caching, introduced in HDFS-4817,
> can help here. The right API here is {{DataOutputStream#setDropBehind}}.
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