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https://issues.apache.org/jira/browse/CARBONDATA-318?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jacky Li updated CARBONDATA-318:
--------------------------------
    Description: 
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 folders

  was:
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


> 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
>             Fix For: 0.2.0-incubating
>
>
> 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 folders



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