[jira] [Created] (CARBONDATA-452) Optimize structure of Dictionary use Trie in place of HashMap

Posted by Akash R Nilugal (Jira) on Nov 27, 2016; 9:47am
URL: http://apache-carbondata-dev-mailing-list-archive.168.s1.nabble.com/jira-Created-CARBONDATA-452-Optimize-structure-of-Dictionary-use-Trie-in-place-of-HashMap-tp3243.html

He Xiaoqiao created CARBONDATA-452:
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             Summary: Optimize structure of Dictionary use Trie in place of HashMap
                 Key: CARBONDATA-452
                 URL: https://issues.apache.org/jira/browse/CARBONDATA-452
             Project: CarbonData
          Issue Type: Improvement
          Components: core
    Affects Versions: 0.2.0-incubating
            Reporter: He Xiaoqiao
            Assignee: He Xiaoqiao
            Priority: Critical


CarbonData apply ConcurrentHashMap to maintain Dictionary currently, and memory footprint is considerable overhead cause it has to load whole Dictionary to decode actual data value, especially column cardinality is a large number.
Update Dictionary using Trie in place of HashMap to reduce memory footprint and improve retrieval performance.



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