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https://issues.apache.org/jira/browse/HDFS-7994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14498881#comment-14498881
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Zhe Zhang commented on HDFS-7994:
---------------------------------
Thanks Hui for the work and Nicholas for the review! This is a nice
optimization.
Sorry for the late comments. Below are some nits that we might want to address
in a follow-on task:
# Seems to be a little weird to have a setter and a getter with the same name.
Since the setter is only called with {{true}}, maybe {{foundxxx}} instead of
{{hasxxx}}?
> 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
> Fix For: HDFS-7285
>
> Attachments: HDFS-7994_001.patch, HDFS-7994_002.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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