[
https://issues.apache.org/jira/browse/HDFS-8823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14643569#comment-14643569
]
Haohui Mai commented on HDFS-8823:
----------------------------------
The WIP patch demonstrates the approach for the changes. It's not ready to run
Jenkins yet. The key idea is to put the replication factor into the
{{BlockInfo}} class, and to update the replication factors in
{{setReplication()}} and snapshot related operations.
> 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.WIP.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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
