Tsz Wo Nicholas Sze created HDFS-7994:
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Summary: 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: Tsz Wo Nicholas Sze
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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