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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2387) [stargate] FUSE module for mounting exported tablespaces
Date Tue, 30 Mar 2010 01:01:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851188#action_12851188

Andrew Purtell commented on HBASE-2387:

Never mind about fuse4j, missed that it is LGPL.

> [stargate] FUSE module for mounting exported tablespaces
> --------------------------------------------------------
>                 Key: HBASE-2387
>                 URL: https://issues.apache.org/jira/browse/HBASE-2387
>             Project: Hadoop HBase
>          Issue Type: New Feature
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>            Priority: Minor
> FUSE: http://fuse.sourceforge.net/
> Create a FUSE translator that mounts exported tablespaces into the Linux filesystem namespace.
Should run in either of two modes:
> 1) Map the exported tablespace under the mount point.
>     - When using stargate this is a 1:1 map of URL paths to filesystem paths.
>     - Via Thrift should have the same mapping but implementation will be more involved.

> 2) Emulate a filesystem, like s3fs (http://code.google.com/p/s3fs/wiki/FuseOverAmazon)
>     - Translate paths under the mount point to row keys for good load spreading, {{/a/b/c/file.ext}}
becomes {{file.ext/c/b/a}}
>     - Consider borrowing from Tom White's Hadoop S3 FS (HADOOP-574), and store file data
as blocks. 
>         -- After fetching the inode can stream all blocks, e.g. via a Stargate multiget.
This would support arbitrary file sizes. Otherwise there is a practical limit somewhere around
20-50 MB with default regionserver heaps. 
>         -- So,  {{file.ext/c/b/a}} gets the inode. Blocks would be keyed using the SHA-1
hash of their contents. 
>         -- Use multiversioning on the inode to get snapshots for free: A path in the
filesystem like {{/a/b/c/file.ext;timestamp}} gets file contents on or before _timestamp_.
>         -- Because new writes produce new blocks with unique hashes, this is like a dedup
filesystem. Use ICV to maintain use counters on blocks.
>     - Stargate multiget and multiput operations can help performance. I don't think Thrift
has a comparable multi-op capability. 
> Support Stargate multiuser mode. 

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