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From "He Xiaoqiao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CARBONDATA-452) Optimize structure of Dictionary use Trie in place of HashMap
Date Sun, 27 Nov 2016 09:47:58 GMT
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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