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Posted to hdfs-dev@hadoop.apache.org by "dragon (JIRA)" <ji...@apache.org> on 2016/03/15 09:15:36 UTC

[jira] [Created] (HDFS-10028) CLONE - Detect if resevered EC Block ID is already used

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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