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https://issues.apache.org/jira/browse/HADOOP-2187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12542626
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Konstantin Shvachko commented on HADOOP-2187:
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I agree, especially since hdfs already calls getBlockLocations(String src, long
offset, long length) inside getHints(). See HADOOP-894.
The return class is called LocatedBlocks. It could be generalized into an
interface if that makes sense for other file systems.
> FileSystem should return location information with byte ranges
> --------------------------------------------------------------
>
> Key: HADOOP-2187
> URL: https://issues.apache.org/jira/browse/HADOOP-2187
> Project: Hadoop
> Issue Type: Improvement
> Components: fs
> Reporter: Owen O'Malley
> Fix For: 0.16.0
>
>
> The FileSystem interface should provide location information with byte ranges
> rather than a String[][] of locations. I suggest that we deprecate
> FileSystem.getFileCacheHints and replace it with:
> {code}
> abstract public class FileSystem {
> ...
> public static class BlockInformation implements Writable {
> public BlockInformation(long start, String[] locations) {...}
> public String[] getHosts() {...}
> public long getStartingOffset() {...}
> }
> BlockInformation[] getFileLocations(Path f, long start, long length) { ...
> }
> }
> {code}
> This will allow us to fix the FileInputFormat in map/reduce to make just one
> call per a file to the name node instead of one per a block.
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