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Posted to hdfs-dev@hadoop.apache.org by "Kai Sasaki (JIRA)" <ji...@apache.org> on 2016/03/15 10:11:33 UTC
[jira] [Resolved] (HDFS-10028) CLONE - Detect if resevered EC Block
ID is already used
[ https://issues.apache.org/jira/browse/HDFS-10028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kai Sasaki resolved HDFS-10028.
-------------------------------
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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