[jira] [Commented] (HDFS-7653) Block Readers and Writers used in both client side and datanode side

["Li Bo (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-7653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14286851#comment-14286851 ] 

Li Bo commented on HDFS-7653:
-----------------------------

This patch includes block readers and writers that will be used by client and datanode. Because there exists BlockReader interface, we named a new interface called UnifiedBlockReader. Its sub classes include: ClientBlockReader(read a block from client), LocalDatanodeBlockReader(read a local block, used inside datanode), RemoteDatanodeBlockReader(read a block from remote datanode, used inside datanode). BlockWriter's sub classes include: ClientBlockWriter(write a block form client), LocalDatanodeBlockWriter(write a block locally, used inside datanode), RemoteDatanodeBlockWriter(write a block to a remote datanode, used inside datanode). Two unit tests are also uploaded.
Welcome to your feedback.

> Block Readers and Writers used in both client side and datanode side
> --------------------------------------------------------------------
>
>                 Key: HDFS-7653
>                 URL: https://issues.apache.org/jira/browse/HDFS-7653
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Li Bo
>            Assignee: Li Bo
>         Attachments: BlockReadersWriters.patch
>
>
> There're a lot of block read/write operations in HDFS-EC, for example, when client writes a file in striping layout, client has to write several blocks to several different datanodes; if a datanode wants to do an encoding/decoding task, it has to read several blocks from itself and other datanodes, and writes one or more blocks to itself or other datanodes.  



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