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From Harsh J <ha...@cloudera.com>
Subject Re: Need to add fs shim to use QFS
Date Wed, 10 Oct 2012 07:05:34 GMT
Hi Steve,

Check out https://issues.apache.org/jira/browse/HADOOP-8886 for the
KFS removal. Seems relevant to your question here.

On Wed, Oct 10, 2012 at 12:52 AM, Steve Loughran <stevel@hortonworks.com> wrote:
> On 5 October 2012 18:27, Thilee Subramaniam <thilee@quantcast.com> wrote:
>> We at Quantcast have released QFS 1.0 (Quantcast File System) to open
>> source. This is based on the KFS 0.5 (Kosmos Distributed File System),
>> a C++ distributed filesystem implementation. KFS plugs into Apache
>> Hadoop via the 'kfs' shim that is part of Hadoop codebase.
>> QFS has added support for permissions, and also, provides fault tolerance
>> through Reed-Solomon encoding as well as replication. There are also a
>> number of performance and stability improvements, including a rewrite of
>> the client library to allow parallel concurrent I/Os. Going forward, new
>> releases of KFS will come from QFS.
> Does this mean the kfs plugin can go from the apache tree?
> One problem that we've always had with KFS is that nobody ever tested the
> filesystem, and it was inevitably out of sync with what was in KFS.
> Have you considered just pulling the kfs lib out and releasing the bridge
> classes yourself? It's what the other FS suppliers do, as it gives them
> more control over the libraries, including the ability to release more
> often.
> -steve

Harsh J

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