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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8823) Move replication factor into individual blocks
Date Tue, 28 Jul 2015 17:40:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14644727#comment-14644727
] 

Andrew Wang commented on HDFS-8823:
-----------------------------------

I think this work should happen on a branch if affects memory usage of current deployments,
at least until we have an implementation of a separated namespace. Even when this is true,
ideally we can still deploy with the current model without introducing extra overheads.

> 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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