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https://issues.apache.org/jira/browse/HDFS-333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14069249#comment-14069249
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Konstantin Shvachko commented on HDFS-333:
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It is still valid. It would formalize and simplify block life cycle management.
> A State Machine for name-node blocks.
> -------------------------------------
>
> Key: HDFS-333
> URL: https://issues.apache.org/jira/browse/HDFS-333
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Konstantin Shvachko
>
> Blocks on the name-node can belong to different collections like the
> blocksMap, under-replicated, over-replicated lists, etc.
> It is getting more and more complicated to keep the lists consistent.
> It would be good to formalize the movement of the blocks between the
> collections using a state machine.
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