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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-7743) Replace *SortReducers with Hadoop Secondary Sort
Date Tue, 12 Mar 2013 21:57:14 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7743?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nick Dimiduk updated HBASE-7743:
--------------------------------

    Issue Type: Sub-task  (was: Improvement)
        Parent: HBASE-8084
    
> Replace *SortReducers with Hadoop Secondary Sort
> ------------------------------------------------
>
>                 Key: HBASE-7743
>                 URL: https://issues.apache.org/jira/browse/HBASE-7743
>             Project: HBase
>          Issue Type: Sub-task
>          Components: mapreduce, Performance
>            Reporter: Nick Dimiduk
>
> The mapreduce package provides two Reducer implementations, KeyValueSortReducer and PutSortReducer,
which are used by Import, ImportTsv, and WALPlayer in conjunction with the HFileOutputFormat.
Both of these implementations make use of a TreeSet to sort values matching a key. This reducer
will OOM when rows are large.
> A better solution would be to implement secondary sort of the values. That way hadoop
sorts the records, spilling to disk when necessary.

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