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https://issues.apache.org/jira/browse/HDFS-10940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daryn Sharp updated HDFS-10940:
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Status: Patch Available (was: Open)
> Reduce performance penalty of block caching when not used
> ---------------------------------------------------------
>
> Key: HDFS-10940
> URL: https://issues.apache.org/jira/browse/HDFS-10940
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.7
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HDFS-10940.patch
>
>
> For every block location generated, the CacheManager will create a junk
> object for a hash lookup of cached locations. If there are no cached blocks,
> none of this is required.
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