FileSystem should return location information with byte ranges
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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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