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Kern Sibbald wrote:
> Hello,
>
> Last night I released two Beta version of Bacula source and Win32 binaries to
> Source Forge. The first is Bacula version 2.2.9-b7, which is the seventh in
> the series of 2.2.9 beta release (b5 was never released). This version has a
> few additional fixes to the prior 2.2.9 beta release:
>
> - Close bat console windows first to eliminate error message
> from the notifier.
> - Remove useless code in Scheduler that causes seg fault on
> termination.
> - Correct some SD catalog request error messages.
> - Don't allow pruning of any running job.
> - Turn off code in read_record that causes a seg fault in the SD
> when reading past an EOS_LABEL.
> - Turn off unloading the autochanger in reserve.c as it just
> causes problems.
> - Lock volumes when unreserving a device.
> - Do not mark volume unused when recycling.
> - When acquiring, don't mark volume unused if it is reserved (busy).
>
> In short, if you are using a Bacula 2.2.9 beta version, this one should be an
> improvement.
>
> As some of you have experienced first hand, Bacula is being used in
> situations
> that stress its current capabilities -- particularly when running large
> numbers of simultaneous backups on multiple drive autochangers. The main
> problem occurs when Bacula has reserved a particular drive and wants a tape
> that is on another drive. This often leads to deadlock situations or job
> failures. Fortunately this seems to be limited to a relatively small set of
> users, but on the other hand, they are *big* users so the problem can cause
> 50 or more jobs to fail. This problem is described in bug #1053, and I have
> spent a huge amount of time working on it, analyzing the problems, and
> patching all to little or no avail.
>
> As a consequence, I am not really very happy with the 2.2.9 beta versions,
> and
> hence have never officially released it.
>
> I finally came to the conclusion that it was fruitless to continue trying to
> patch it, so I spent 2 weeks making significant changes to the volume
> management routines in the SD, and ended up with something that though not a
> true solution is a big improvement and much simpler. It involves something
> line 2,900 lines of changes to 2.2.9-b7, so I have renumbered it 2.2.10-b1,
> and this is the second release that I made last night.
>
> 2.2.10-b1 is significantly better at passing the regression tests than 2.2.9.
>
> However, with 2,900 lines of changes, we can expect some problems. So I
> recommend that anyone that is having problems with 2.2.9 on multiple drive
> autochangers (or bug #1053) to try with caution version 2.2.10-b1.
> The changes to this version are:
>
>
> kes Permit multiple simultaneous restores -- experiment.
> kes Backport development stream SD reservation system changes.
> See below:
> ===
> kes Move final volume swapping code to DCR method and
> call it from acquire_for_read().
> kes When wrong volume is mounted during read, unload_autochanger.
> kes Stop searching for Volumes in SD askdir if DIR returns the
> same volume name twice in a row.
> kes Tweak the swap Volume from one drive to another code so that
> it now seems to work.
> kes Resolve several problems with recycling that broke the new
> code (these problems are in 2.2.9 as well).
> kes Remove the volume lock when calling the sysop code.
> kes Don't mark a reserved volume with no writers as unused otherwise
> jobs fail.
> kes Rework class structures for VOLRES, DCR, and DEVICE to make
> the method names a bit more logical, and for more logically
> handling the responsibilities.
> kes Remove redundant code in terminating the scheduler that just
> causes a seg fault in many cases.
> kes Cleanup releasing a volume and make it a DCR method.
> kes Improve algorithm for detecting pre-reserved volume and
> swapping volumes.
> kes Tweak volume swapping code so it works.
> kes Correct name overloading in mount.c
> kes Replace released flag in VOLRES with reserved and add access
> methods for the VOLRES class.
> kes Prevent volume from being released while being swapped.
> kes Refactor parts of stored/mount.c
> ebl Add sanity checks for VolWriteTime and VolReadTime
> ebl Take care of bad clock changes while computing VolWriteTime
> and VolReadTime. This should fix or limit #1066
> kes Correct error string numbers in dird/catreq.c
> kes Restructure reserving, acquiring, and mounting volumes. Calls to
> autochanger are deferred for mount.c -- simplifes the code.
> kes Do not prune any running job. It just fails the job.
> kes Lock the volumes when changing dev->reserved_device and marking
> the volume unused otherwise the device can get reserved by
> another job before the volume is released, thus blocking it.
> ===
>
> I would particularly appreciate feedback on version 2.2.10 (send your
> comments
> directly to me or to the bacula-devel list).
>
> Vacation:
> I will be on vacation from 20-27 April in Cameroon, so will be definitely out
> of touch the project and my email for that time.
>
> Unfortunate tendencies:
>
> Eric Bollengier just brought the following information to my attention:
>
> http://jcole.us/blog/archives/2008/04/14/just-announced-mysql-to-launch-new-features-only-in-mysql-enterprise/
>
> Summary, MySQL is going to have two versions: one Open Source, and one
> Enterprise (for $$$) with more features.
>
> This is not really unexpected, because we have already seen companies such as
> Zmanda making proprietary "Enterprise" additions to Amanda. However, it is
> something that I consider terribly unfortunate both for the Open Source
> community which will be deprived of important features, largely based on work
> they have done, and also for the Enterprise market that will receive
> inferior "proprietary" code because it has not been reviewed and tested by
> Open Source users.
>
> You might be aware that Bacula is quickly entering the Enterprise market, and
> that we have been working on providing professional support, training, and
> consulting services for Bacula to promote Enterprise use of Bacula. We hope
> to officially announce this within the next month, and remind you that I have
> send several detailed emails on this in the past, so for the moment, if you
> have any questions, please refer to those emails. The most complete was an
> email I sent on 16 July 2007 (see gmane or other email archive). The only
> significant change to that email is that we are not currently looking for
> additional founders, but will probably be looking for employees shortly.
>
> You might ask if Bacula will go the direction of Zmanda, MySQL, and others.
> My answer is that I cannot imagine it for three reasons: 1. I have
> transferred the copyright to the Free Software Foundation Europe, which
> basically prevents anyone but the original authors from creating proprietary
> versions. 2. The new company is committed to having ensuring that
> functionally the Community version == Enterprise version. There will be
> minor differences in the branding (i.e. clearly indicate the binary was
> created by the company) and in the testing done. 3. I am and have been
> thoroughly committed and dedicated to Open Source for at least 10 years now.
>
> I hope this will reassure and satisfy the Open Source community and the
> Enterprise market concerning Bacula's future, but it surely won't please big
> corporations or VCs looking to snap up Open Source software projects and take
> them private.
Kern,
Thanks for the detailed and complete summary. That is often something
that is lacking in open-source projects, and it is nice to see that
someone is steering the ship. :)
=R
- --
---- _ _ _ _ ___ _ _ _
|Y#| | | |\/| | \ |\ | | |Ryan Novosielski - Systems Programmer II
|$&| |__| | | |__/ | \| _| |novosirj AT umdnj DOT edu - 973/972.0922 (2-0922)
\__/ Univ. of Med. and Dent.|IST/AST - NJMS Medical Science Bldg - C630
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