[jira] Updated: (HDFS-1407) Use Block in DataTransferProtocol

["Suresh Srinivas (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-1407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Suresh Srinivas updated HDFS-1407:
----------------------------------

    Attachment: HDFS-1400.trunk.patch

> 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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