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Doug Cutting commented on HADOOP-2187:
--------------------------------------

+1 This sounds like a good change.

I might instead call the class BlockLocations, and the methods getBlockLocations.

When we deprecate the existing method ideally we can upgrade all existing implementations with a single back-compatibility implementation on the base class.

Also, should we refer to hosts by hostname or IP here?
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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postedNov 10, '07 at 5:24p
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