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[jira] [Created] (CARBONDATA-318) Implement an ExternalSorter that makes maximum usage of memory while sorting

Posted by Akash R Nilugal (Jira) on Oct 15, 2016; 5:37am
URL: http://apache-carbondata-dev-mailing-list-archive.168.s1.nabble.com/jira-Created-CARBONDATA-318-Implement-an-ExternalSorter-that-makes-maximum-usage-of-memory-while-sorg-tp1957.html

Jacky Li created CARBONDATA-318:
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             Summary: Implement an ExternalSorter that makes maximum usage of memory while sorting
                 Key: CARBONDATA-318
                 URL: https://issues.apache.org/jira/browse/CARBONDATA-318
             Project: CarbonData
          Issue Type: Sub-task
            Reporter: Jacky Li


External Sorter should sort in memory until it reach configured size, then spill to disk. It should provide following interface:
1. insertRow/insertRowBatch: insert rows into the sorter
2. getIterator: return an iterator that iterate on sorted rows

External Sorter depends on FileWriterFactory to get a FileWriter to spill data into files. FileWriterFactory should be provided by user. Multiple implementations are possible, like writing into one folder or multiple folder



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