[jira] [Commented] (HBASE-2387) FUSE module for mounting exported tablespaces

["Andrew Purtell (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-2387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13994735#comment-13994735 ] 

Andrew Purtell commented on HBASE-2387:
---------------------------------------

Cant bring myself to resolve this just yet. Still an interesting idea. But let's not use the REST gateway, it's always going to be slow. 

> FUSE module for mounting exported tablespaces
> ---------------------------------------------
>
>                 Key: HBASE-2387
>                 URL: https://issues.apache.org/jira/browse/HBASE-2387
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: 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.
>     - If backing with Stargate this is a 1:1 map of resource paths to filesystem paths.
>     - Via Thrift or Avro connector, 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 multiget if available. 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.
> If backing with Stargate, support its multiuser mode. 



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