[
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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
