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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