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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8823) Move replication factor into individual blocks
Date Thu, 20 Aug 2015 21:57:45 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14705840#comment-14705840
] 

Jing Zhao commented on HDFS-8823:
---------------------------------

+1 for the latest patch.

> 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, HDFS-8823.001.patch, HDFS-8823.002.patch, HDFS-8823.003.patch,
HDFS-8823.004.patch, HDFS-8823.005.patch, HDFS-8823.006.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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