dragon created HDFS-10028:
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Summary: 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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