hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8059) Erasure coding: revisit how to store EC schema and cellSize in NameNode
Date Thu, 16 Jul 2015 22:12:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14630433#comment-14630433
] 

Haohui Mai commented on HDFS-8059:
----------------------------------

-1

EC schema / cellSize are information at the storage layer. They are tied to blocks but not
files. This goes against the effort of separating the block layer and namespace.


> Erasure coding: revisit how to store EC schema and cellSize in NameNode
> -----------------------------------------------------------------------
>
>                 Key: HDFS-8059
>                 URL: https://issues.apache.org/jira/browse/HDFS-8059
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: HDFS-7285
>            Reporter: Yi Liu
>            Assignee: Yi Liu
>         Attachments: HDFS-8059.001.patch
>
>
> Move {{dataBlockNum}} and {{parityBlockNum}} from BlockInfoStriped to INodeFile, and
store them in {{FileWithStripedBlocksFeature}}.
> Ideally these two nums are the same for all striped blocks in a file, and store them
in BlockInfoStriped will waste NN memory.



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

Mime
View raw message