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Posted to hdfs-issues@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2016/09/30 20:35:21 UTC

[jira] [Created] (HDFS-10940) Reduce performance penalty of block caching when not used

Daryn Sharp created HDFS-10940:
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             Summary: 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


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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