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Today's Topics:
1. Re: [Netdot - Feature #1870] (New) Improve zonefile and DHCPD
config file generation (Carlos Vicente)
----------------------------------------------------------------------
Message: 1
Date: Sat, 11 Jul 2015 16:08:43 -0400
From: Carlos Vicente <[email protected]>
Subject: Re: [Netdot-devel] [Netdot - Feature #1870] (New) Improve
zonefile and DHCPD config file generation
To: Bob Harold <[email protected]>
Cc: [email protected]
Message-ID: <[email protected]>
Content-Type: text/plain; charset=windows-1252
Netdot can actually generate zone files pretty fast. This is the time it takes
to generate 190 zones in a modest test VM:
real 0m8.014s
user 0m2.628s
sys 0m1.284s
and that includes generating the contents, writing to disk and updating the
checksums on each zone.
The fact that a zone?s final contents is dependent on the state of at least 13
tables makes the code to set that ?touched? flag pretty complex and hard to
maintain. I think that the code simplicity justifies the additional CPU cycles.
As always, I?m open to specific suggestions and/or patches.
cv
On Jul 10, 2015, at 4:54 PM, Bob Harold <[email protected]> wrote:
> Can I suggest that generating checksums for every zone on every export
> request could be slow? Perhaps some of the existing code could simply set a
> "touched" flag on the zone, and then only those need to have checksums
> generated and checked.
>
>
>
> --
> Bob Harold
> hostmaster, UMnet, ITcom
> Information and Technology Services (ITS)
> [email protected]
> 734-647-6524 desk
>
> On Fri, Jul 10, 2015 at 2:21 PM, <[email protected]> wrote:
>
> Issue #1870 has been reported by Carlos Vicente.
>
> ----------------------------------------
> Feature #1870: Improve zonefile and DHCPD config file generation
> https://osl.uoregon.edu/redmine/issues/1870
>
> Author: Carlos Vicente
> Status: New
> Priority: High
> Assignee: Carlos Vicente
> Category: Netdot
> Target version: 1.1.0
> Resolution:
>
>
> Currently, these exporter classes use a special table called 'hostaudit' to
> determine whether the files need to be exported. This table is updated with a
> new entry each time that a related record is updated in the DB. This process
> has some important drawbacks:
>
> * The code is complex and ugly
> * There are cases when a change is made, and a second operation cancels the
> previous change, resulting in two entries in the 'hostaudit' table. Even
> though the resulting files are the same, the export happens anyways because
> there isn't enough information to determine that the resulting file will be
> identical as the previous one (except for the zone serial)
>
> The proposed solution is to:
>
> * Remove the 'hostaudit' table and related code
> * Add a 'checksum' field to both the 'zone' table and the 'dhcpscope' table
> * Each time an export is requested, the file is generated in memory. A
> checksum is calculated on the result and it is compared with the current
> checksum in the DB. The file is only printed to disk if the checksums are
> different.
>
>
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