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From "Hui Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7994) Detect if resevered EC Block ID is already used
Date Wed, 08 Apr 2015 06:38:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14484823#comment-14484823
] 

Hui Zheng commented on HDFS-7994:
---------------------------------

Hi Nicholas
I would like to work on this issue.

> Detect if resevered EC Block ID is already used
> -----------------------------------------------
>
>                 Key: HDFS-7994
>                 URL: https://issues.apache.org/jira/browse/HDFS-7994
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Hui Zheng
>
> Since random block IDs were supported by some early version of HDFS, the block ID reserved
for EC blocks could be already used by some existing blocks in a cluster. During NameNode
startup, it detects if there are reserved EC block IDs used by non-EC blocks. If it is the
case, NameNode will do an additional blocksMap lookup when there is a miss in a blockGroupsMap
lookup.



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