Ewan Higgs updated HDFS-10867:
    Attachment:     (was: Block Bit Field Allocation of Provided Storage.docx)

> 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
>         Attachments: Block Bit Field Allocation of Provided Storage.pdf
> 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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