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https://issues.apache.org/jira/browse/HDFS-10028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kai Sasaki resolved HDFS-10028.
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Resolution: Invalid
> CLONE - Detect if resevered EC Block ID is already used
> -------------------------------------------------------
>
> Key: HDFS-10028
> URL: https://issues.apache.org/jira/browse/HDFS-10028
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: dragon
> Assignee: Hui Zheng
> Fix For: HDFS-7285
>
>
> 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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