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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7994) Detect if resevered EC Block ID is already used
Date Tue, 14 Apr 2015 23:27:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14495141#comment-14495141
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Tsz Wo Nicholas Sze commented on HDFS-7994:
-------------------------------------------

We should also check the block IDs for adding UnderConstruction files and snapshot deleted
files in fsimage and FSEditLogLoader.updateBlocks(..).  In general, let's add a utility method
to FSImageUtil for addBlockCollection and check block ID there.  Then all the calls in fsimage
and editlog should use it instead of BlockManager.addBlockCollection.




> 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
>          Components: namenode
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Hui Zheng
>         Attachments: HDFS-7994_001.patch
>
>
> 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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