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