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https://issues.apache.org/jira/browse/HDFS-1407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suresh Srinivas updated HDFS-1407:
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Status: Open (was: Patch Available)
> 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, 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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