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https://issues.apache.org/jira/browse/HDFS-4645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13615955#comment-13615955
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Aaron T. Myers commented on HDFS-4645:
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This seems fine to me in the abstract, though I'm not sure what the original
motivation of randomly generating the IDs was. What's the motivation for
changing it now, anyway?
One challenge with implementing this will be how to do upgrades from existing
clusters which already have block IDs randomly distributed across the valid
range. Any thoughts on how to handle that?
> Move from randomly generated block ID to sequentially generated block ID
> ------------------------------------------------------------------------
>
> Key: HDFS-4645
> URL: https://issues.apache.org/jira/browse/HDFS-4645
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 3.0.0
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
>
> Currently block IDs are randomly generated. This means there is no pattern to
> block ID generation and no guarantees such as uniqueness of block ID for the
> life time of the system can be made. I propose using SequentialNumber for
> block ID generation.
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