New user, a couple of questions

Brad Fitzpatrick brad at
Fri Sep 2 10:04:57 PDT 2005

On Thu, 1 Sep 2005, Edward Abrams wrote:

> Hi,
> I'm new to MogileFS and new to this list. I have a couple of questions.
> Hopefully someone can provide answers, or, reference a place where I can
> find the answers.
> 1. License. Some of the items in your distribution refer to the license that
> perl is under, or the GPL or other relatively open licenses. Other items,
> specifically the files in mogilefs-server and Perlbal-XS, lack a license or
> remark that the license is 'undecided.' As a potential deployer of this
> software, I wonder if you could clarify the license situation.

Terms of Perl itself.  (GPL or Artistic)

> 2. Mogstored. In some preliminary tests, I seemed to notice that with
> multiple trackers running, I could bring individual trackers down without
> interrupting my correctly configured clients. That was good. However, I also
> seemed to notice that by killing certain mogstored's, I was able to cause
> errors with getting and writing files, even though mogstored's were up for
> which the file was present, or a writeable device was available. I could
> correct the situation by marking the mogstored host in question as 'down' or
> 'dead' in the database, but of course that is a manual procedure. Is there
> any automatic way to recover from mogstored failures, or must it be manual
> or automated in a way I devise? Or, do I have something misconfigured? I
> hope I am right in regarding it as a Bad Thing if various mogileFS reads and
> writes would fail due to one out of many mogstored's being dead.

A write to a mogstored that's halfway done is expected to fail, likewise
with reads.  But any just-starting read or write should recover and find a
new storage node.

You using the Perl client library?

- Brad

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