dfs client protocol should allow asking for parts of the block map
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Key: HADOOP-894
URL: https://issues.apache.org/jira/browse/HADOOP-894
Project: Hadoop
Issue Type: Improvement
Components: dfs
Reporter: Owen O'Malley
Assigned To: Sameer Paranjpye
I think that the HDFS client protocol should change like:
/** The meta-data about a file that was opened. */
class OpenFileInfo {
/** the info for the first block */
public LocatedBlockInfo getBlockInfo();
public long getBlockSize();
public long getLength();
}
interface ClientProtocol extends VersionedProtocol {
public OpenFileInfo open(String name) throws IOException;
/** get block info for any range of blocks */
public LocatedBlockInfo[] getBlockInfo(String name, int blockOffset, int
blockLength) throws IOException;
}
so that the client can decide how much block info to request and when.
Currently, when the file is opened or an error occurs, the entire block list is
requested and sent.
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