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Posted to hdfs-issues@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2018/03/29 22:02:00 UTC
[jira] [Commented] (HDFS-10867) [PROVIDED Phase 2] Block Bit Field
Allocation of Provided Storage
[ https://issues.apache.org/jira/browse/HDFS-10867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16419853#comment-16419853 ]
Daryn Sharp commented on HDFS-10867:
------------------------------------
Don't forget about legacy negative block ids that already aren't compatible with EC assumptions. You can't rob the upper bits of a block id.
> [PROVIDED Phase 2] 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
> Priority: Major
> 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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