Bugs item #1995879, was opened at 2008-06-17 12:05
Message generated for change (Comment added) made by sjoerd
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Category: PF/runtime
Group: MonetDB4 4.24
>Status: Open
Resolution: None
Priority: 6
Private: No
Submitted By: Peter Boncz (boncz)
Assigned to: Peter Boncz (boncz)
Summary: algebra kills admin GUI

Initial Comment:
when algebra is default, the XRPC admin GUI does not work anymore, and blocks 
all subsequent queries. 

The problem is that XRPC should continue to use mps, whatever the compiler 
choice is for mapi sessions. This should be enforced in the code.

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>Comment By: Sjoerd Mullender (sjoerd)
Date: 2008-06-17 23:31

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You say "fixed in stable" but I only see a checkin in the current branch.

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Comment By: Stefan Manegold (stmane)
Date: 2008-06-17 21:28

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Thanks for the fix, Peter.

Shall we skip the propagation of these fixes to the development trunk to
keep us reminded that XRPC still need to be ported to the Algebra
back-end?

Or shall we simply port them "for convenience"?


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Comment By: Peter Boncz (boncz)
Date: 2008-06-17 19:08

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fixed in stable

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Comment By: Stefan Manegold (stmane)
Date: 2008-06-17 14:41

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The attached patch (to be applied to the XQuery_0-24 release branch, but
not to be propagated to the development trunk) does the following for/with
the StandOff extensions:

In case 
(1) Pathfinder is configured with --with-default-backend=algebra AND 
(2) StandOff extensions are enabled at runtime via `Mserver --set
standoff=enabled` and/or `pf --enable-standoff` AND
(3) the Algebra back-end is NOT explicitly requested via `Mserver --set
xquery_backend=algebra`, `pf -A`, or `mclient -G`
then, Pathfinder automatically falls back to thew "milprint_summer"
back-end to enable support for the StandOff extensions.

I don't know, yet, how to achieve a similar setup for XRPC or at least the
admininstrative console.

File Added: StandOff-MPS-patch.diff

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Comment By: Stefan Manegold (stmane)
Date: 2008-06-17 12:24

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Enforcing the use of (fall-back to) MPS for features that are no yet
supported by / ported to ALG is an interesting idea
(in the release branch, only; otherwise we might forget to port them for
the next release).

... at least for features whose use can easily be detected automatically
before query compilation ...

Any ideas, how/where to do this for XRPC (I'm an XRPC illiterate)?
Would any other features be suitable for "automatic detection and
fall-back to MPS"?
Cannot imagine how to do it for, e.g., pre-compiled MIL modules and/or
recusive functions.
Standoff extensions seem to a be simple candidate: `--set
standoff=enabled` triggers `--set xquery_backend=milprint_summer`.


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