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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7716) Erasure Coding: extend BlockInfo to handle EC info
Date Thu, 05 Feb 2015 01:36:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14306407#comment-14306407
] 

Jing Zhao commented on HDFS-7716:
---------------------------------

Here is the plan:
# the class BlockInfo holds the common information and methods
# create a new class BlockReplicationInfo extending BlockInfo for replication explicit logic
# create a new class BlockGroupInfo extending BlockInfo for handling EC
# we will still have BlockReplicationInfoUC and BlockGroupInfoUC to handle under construction
stage
# INodeFile still contains a BlockReplicationInfo array for replicated blocks. In case that
the file is erasure coded, the file contains an extra inode feature to store the BlockGroupInfo
array

> Erasure Coding: extend BlockInfo to handle EC info
> --------------------------------------------------
>
>                 Key: HDFS-7716
>                 URL: https://issues.apache.org/jira/browse/HDFS-7716
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>
> The current BlockInfo's implementation only supports the replication mechanism. To use
the same blocksMap handling block group and its data/parity blocks, we need to define a new
BlockGroupInfo class.



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