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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7653) Block Readers and Writers used in both client side and datanode side
Date Fri, 23 Jan 2015 19:19:36 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14289772#comment-14289772
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Tsz Wo Nicholas Sze commented on HDFS-7653:
-------------------------------------------

Sound good.  Thanks!

> 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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