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https://issues.apache.org/jira/browse/HBASE-2387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851036#action_12851036
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Andrew Purtell commented on HBASE-2387:
---------------------------------------
fuse4j: git://github.com/dtrott/fuse4j.git
> [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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