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[ https://issues.apache.org/jira/browse/HADOOP-2027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

lohit vijayarenu updated HADOOP-2027:
-------------------------------------

Release Note: New FileSystem API getFileBlockLocations to return the number of bytes in each block in a file via a single rpc to the namenode to speed up job planning. Deprecates getFileCacheHints.
Hadoop Flags: [Incompatible change]
FileSystem should provide byte ranges for file locations
--------------------------------------------------------

Key: HADOOP-2027
URL: https://issues.apache.org/jira/browse/HADOOP-2027
Project: Hadoop Core
Issue Type: Bug
Components: fs
Reporter: Owen O'Malley
Assignee: lohit vijayarenu
Fix For: 0.17.0

Attachments: HADOOP-2027-1.patch, HADOOP-2027-10.patch, HADOOP-2027-14.patch, HADOOP-2027-2.patch, HADOOP-2027-3.patch, HADOOP-2027-4.patch, HADOOP-2027-5.patch, HADOOP-2027-6.patch, HADOOP-2027-7.patch, HADOOP-2027-8.patch, HADOOP-2027-9.patch, HADOOP-2559-11.patch, HADOOP-2559-12.patch, HADOOP-2559-13.patch


FileSystem's getFileCacheHints should be replaced with something more useful. I'd suggest replacing getFileCacheHints with a new method:
{code}
BlockLocation[] getFileLocations(Path file, long offset, long range) throws IOException;
{code}
and adding
{code}
class BlockLocation implements Writable {
String[] getHosts();
long getOffset();
long getLength();
}
{code}
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postedApr 17, '08 at 5:12a
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