hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8023) Erasure Coding: retrieve eraure coding policy and schema for a block or file from NameNode
Date Tue, 07 Apr 2015 18:25:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14483699#comment-14483699
] 

Jing Zhao commented on HDFS-8023:
---------------------------------

Thanks [~vinayrpet] for the work and [~drankye] for the review! Some comments and questions:
# Maybe we can move ECInfo to the o.a.h.hdfs.protocol package?
# The name "ECInfo" looks better to me compared with "ECZoneInfo" because it is used to tell
the information of individual files/directories. We can make it independent with our design/implementation
about how to specify the EC schema for files/directories.
# getErasureCondingInfo --> getErasureCodingInfo
# Do we need to provide {{DatanodeProtocol#getErasureCodingInfo(ExtendedBlock)}}? Currently
a DataNode cannot distinguish a contiguous block and a block that belongs to a striped block
group. And for recovery, I guess we only need to include the ECSchema information in the corresponding
recovery command?

> Erasure Coding: retrieve eraure coding policy and schema for a block or file from NameNode
> ------------------------------------------------------------------------------------------
>
>                 Key: HDFS-8023
>                 URL: https://issues.apache.org/jira/browse/HDFS-8023
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Vinayakumar B
>         Attachments: HDFS-8023-01.patch
>
>
> NameNode needs to provide RPC call for client, tool, or DataNode to retrieve eraure coding
policy and schema for a block or file from NameNode.



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

Mime
View raw message