Ewan Higgs created HDFS-10867:
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             Summary: Block Bit Field Allocation of Provided Storage
                 Key: HDFS-10867
                 URL: https://issues.apache.org/jira/browse/HDFS-10867
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: hdfs
            Reporter: Ewan Higgs


We wish to design and implement the following related features for provided 
storage:
# Dynamic mounting of provided storage within a Namenode (mount, unmount)
# Mount multiple provided storage systems on a single Namenode.
# Support updates to the provided storage system without having to regenerate 
an fsimg.

A mount in the namespace addresses a corresponding set of block data. When 
unmounted, any block data associated with the mount becomes invalid and 
(eventually) unaddressable in HDFS. As with erasure-coded blocks, efficient 
unmounting requires that all blocks with that attribute be identifiable by the 
block management layer

In this subtask, we focus on changes and conventions to the block management 
layer. Namespace operations are covered in a separate subtask.



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