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