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https://issues.apache.org/jira/browse/HDFS-8823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14650073#comment-14650073
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Haohui Mai commented on HDFS-8823:
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This jira is focus on replication factor. I suggest opening another jira if you
want to discuss moving storage policy.
Although it looks like no consensuses have been reached yet, I encourage you to
submit a patch to demonstrate your idea. Comments on such a high level can be
quite vague and speculative. Code talks.
> Move replication factor into individual blocks
> ----------------------------------------------
>
> Key: HDFS-8823
> URL: https://issues.apache.org/jira/browse/HDFS-8823
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Haohui Mai
> Assignee: Haohui Mai
> Attachments: HDFS-8823.000.patch
>
>
> This jira proposes to record the replication factor in the {{BlockInfo}}
> class. The changes have two advantages:
> * Decoupling the namespace and the block management layer. It is a
> prerequisite step to move block management off the heap or to a separate
> process.
> * Increased flexibility on replicating blocks. Currently the replication
> factors of all blocks have to be the same. The replication factors of these
> blocks are equal to the highest replication factor across all snapshots. The
> changes will allow blocks in a file to have different replication factor,
> potentially saving some space.
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