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