Use Block in DataTransferProtocol
---------------------------------
Key: HDFS-1407
URL: https://issues.apache.org/jira/browse/HDFS-1407
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Suresh Srinivas
Assignee: Suresh Srinivas
Fix For: 0.22.0
Attachments: HDFS-1400.trunk.patch
Currently DataTransferProtocol has methods such as:
{noformat}
public static void opReadBlock(DataOutputStream out, long blockId,
long blockGs, long blockOffset, long blockLen, String clientName,
Token<BlockTokenIdentifier> blockToken) throws IOException;
{noformat}
The client has to pass the individual elements that make block identification
such as blockId and generation stamp. I propose methods with the following
format:
{noformat}
public static void opReadBlock(DataOutputStream out, Block block,
long blockOffset, long blockLen, String clientName,
Token<BlockTokenIdentifier> blockToken) throws IOException;
{noformat}
With this, the client need not understand the internals of Block. It receives
Block over RPC and sends it in DataTransferProtocol. This helps in making Block
opaque to the client.
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