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From "Ewan Higgs (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10867) Block Bit Field Allocation of Provided Storage
Date Fri, 16 Sep 2016 09:15:20 GMT
Ewan Higgs created HDFS-10867:
---------------------------------

             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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