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Posted to hdfs-dev@hadoop.apache.org by "Haohui Mai (JIRA)" <ji...@apache.org> on 2015/07/28 00:55:04 UTC

[jira] [Created] (HDFS-8823) Move replication factor into individual blocks

Haohui Mai created HDFS-8823:
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             Summary: 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


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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