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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-2387) FUSE module for mounting exported tablespaces
Date Sun, 08 Jun 2014 21:57:06 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Andrew Purtell resolved HBASE-2387.

    Resolution: Later

> 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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