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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2187) FileSystem should return location information with byte ranges
Date Mon, 12 Nov 2007 20:34:52 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12541943
] 

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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