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From "Kai Sasaki (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-10028) CLONE - Detect if resevered EC Block ID is already used
Date Tue, 15 Mar 2016 09:11:33 GMT

     [ 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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