[jira] [Updated] (MAPREDUCE-3086) Supporting range scan using TFile, TotalOrderPartitioner and partition index

["Allen Wittenauer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Allen Wittenauer updated MAPREDUCE-3086:
----------------------------------------
    Status: Open  (was: Patch Available)

> Supporting range scan using TFile, TotalOrderPartitioner and partition index
> ----------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3086
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3086
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 0.20.205.0
>            Reporter: Binglin Chang
>            Assignee: Binglin Chang
>         Attachments: MAPREDUCE-3086.v1.patch
>
>
> Hive/HBase already has similar or more powerful functionality, but using hive/hbase is overkill or inconvenient for some cases, so add some lightweight utility classes to only support range scan should be reasonable. The utility classes include:
> # InputFormat supporting range scan: Indexed(Text|Binary)InputFormat
>   The input directory for IndexInputFormat should contain one partition index and many tfiles, each tfile store a certain range of keys, not overlapping with other tfiles, the boundaries are stored in partition index.
>   Add 4 jobconfs: mapred.indexed(text|binary)inputformat.key.(start|end), indicate range scan parameters. 
>   For a mapreduce job using IndexedInputFormat, IndexedInputFormat.getSplits filter out tfiles which are not in the scan range using partition index
>   IndexedInputFormat do not support multi directory & splitting in single file, these can be added in future.
> # Tool to convert data of other format into IndexedInputForamt: TotalOrderIndexBuilder
>   If the input data is already total order partitioned and is tfile format, just add partition index to input directory
>   Or run InputSampler to generate partiton index, then run mapreduce job with TotalOrder partitioner to generate tfile backed data, finally move partition index to output directory. 
> # Client tool to scan/search indexed data directory



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