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<p>Hi Martin,</p>
<p>Although getting EPrints to work nicely in a distributed
environment would be a great thing to have, it feels like a
Herculean task, as there are so many aspects of EPrints that would
need to be considered. It would certainly be a very interesting
project that I would like to be involved with if time permits.
However, it may be better led by someone like yourself who has had
greater experience adapting your EPrints repository into one that
works in a somewhat distributed manner.</p>
<p>I am happy to get together for a online chat (e.g. Zoom, Teams,
Jitsi, etc.) to discuss how we might take this forward. It would
be good to have other people involved in this initial chat
(although experience tells me that many more than six people in a
video call starts to get a bit manic). Feel free to suggest some
times and dates you are free for such a discussion and we can
figure out how/when to do this.</p>
<p>Regards</p>
<p>David Newman<br>
</p>
<div class="moz-cite-prefix">On 27/01/2021 11:32, Martin Braendle
via Eprints-tech wrote:<br>
</div>
<blockquote type="cite" cite="mid:EMEW3|1daca410caffaaf231f2ed8bbd15ab7ex0QBke14eprints-tech-bounces|ecs.soton.ac.uk|OF0C66CF7A.560610A8-ONC125866A.003CE8CC-C125866A.003F6D5B@lotus.uzh.ch">
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<p><font size="2" face="sans-serif">Hi David,</font><br>
<br>
<font size="2" face="sans-serif">interesting thread. In our
case, we have a three-server setup running on a shared file
system.</font><br>
<font size="2" face="sans-serif">The indexer runs on a compute
node that also carries out all the cronjobs so that the web
servers are free for their task to serve to the Web.</font><br>
<font size="2" face="sans-serif">Calling cgi/counter on one of
the web servers will always tell us that there is no indexer
running because there is no matching process id from the
indexer.pid file on the compute node.
</font><br>
<font size="2" face="sans-serif">Also, starting/stopping the
indexer would just start another instance on the web server
node (and probably raise a conflict in the indexer.pid
file). So we never do that this way, but via console or
scripts (e.g. in the case of automated backups of the Xapian
index).</font><br>
<br>
<font size="2" face="sans-serif">Which brings us to the topic
that EPrints never really has been made for a distributed
environment - any plans that this will change in the future?</font><br>
<br>
<font size="2" face="sans-serif">Kind regards,</font><br>
<br>
<font size="2" face="sans-serif">Martin</font><br>
<br>
<font size="2" face="sans-serif">--</font><br>
<font size="2" face="sans-serif">Dr. Martin Brändle</font><br>
<font size="2" face="sans-serif">Zentrale Informatik</font><br>
<font size="2" face="sans-serif">Universität Zürich</font><br>
<font size="2" face="sans-serif">Stampfenbachstr. 73</font><br>
<font size="2" face="sans-serif">CH-8006 Zürich</font><br>
<br>
<br>
<img src="cid:part1.129479EC.1D368D8C@ecs.soton.ac.uk" alt="Inactive hide details for "systems via
Eprints-tech" ---27/01/2021 12:02:49---CAUTION: This
e-mail originated outside the Unive" class="" width="16" height="16" border="0"><font size="2" face="sans-serif" color="#424282">"systems via Eprints-tech" ---27/01/2021
12:02:49---CAUTION: This e-mail originated outside the
University of Southampton. Hi David,</font><br>
<br>
<font size="1" face="sans-serif" color="#5F5F5F">Von: </font><font size="1" face="sans-serif">"systems via Eprints-tech"
<a class="moz-txt-link-rfc2396E" href="mailto:eprints-tech@ecs.soton.ac.uk"><eprints-tech@ecs.soton.ac.uk></a></font><br>
<font size="1" face="sans-serif" color="#5F5F5F">An: </font><font size="1" face="sans-serif"><a class="moz-txt-link-rfc2396E" href="mailto:eprints-tech@ecs.soton.ac.uk"><eprints-tech@ecs.soton.ac.uk></a></font><br>
<font size="1" face="sans-serif" color="#5F5F5F">Datum: </font><font size="1" face="sans-serif">27/01/2021 12:02</font><br>
<font size="1" face="sans-serif" color="#5F5F5F">Betreff: </font><font size="1" face="sans-serif">Re: [EP-tech] [ext] Re: [3.4.2]
Wrong status of indexer on the admin site</font><br>
<font size="1" face="sans-serif" color="#5F5F5F">Gesendet von:
</font><font size="1" face="sans-serif"><a class="moz-txt-link-rfc2396E" href="mailto:eprints-tech-bounces@ecs.soton.ac.uk"><eprints-tech-bounces@ecs.soton.ac.uk></a></font><br>
</p>
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<br>
<br>
<br>
<tt><font size="2">CAUTION: This e-mail originated outside the
University of Southampton.<br>
<br>
Hi David,<br>
I only see the button "start indexer".<br>
The page says that the indexer is stopped, but the indexer
process is alive.<br>
<br>
ps axu | grep $(cat /usr/share/eprints/var/indexer.pid)<br>
eprints 6134 0.0 2.7 210776 50992 ? Ss 11:06
0:00<br>
indexer<br>
<br>
The indexer.tick exits and will contain:<br>
<br>
cat /usr/share/eprints/var/indexer.tick<br>
# This file is by the indexer to indicate<br>
# that the indexer is still is_running.<br>
<br>
When I stop the idexer via<br>
systemctl stop epindexer<br>
<br>
The pid and tick file is gone and no inder process is
running now.<br>
And the log if it says:<br>
[Wed Jan 27 11:25:18 2021] 6134 *** Indexer sub-process
stopped<br>
[Wed Jan 27 11:25:18 2021] 6134 ** Indexer process stopping<br>
<br>
It looks like, when the indexer is starte via the command
line, then the<br>
gui don't detect it and vice versa.<br>
<br>
After starting it from the gui, the gui say the it will
runs, but not<br>
the console.<br>
<br>
systemctl status epindexer<br>
● epindexer.service - The eprints indexer<br>
Loaded: loaded
(/usr/lib/systemd/system/epindexer.service; static;<br>
vendor preset: disabled)<br>
Active: inactive (dead)<br>
<br>
<br>
<br>
Am 27.01.21 um 10:42 schrieb David R Newman:<br>
> Hi,<br>
><br>
> This is an interesting issue. When you go to the main
Admin menu page<br>
> under the System Tools tab what buttons are available
for starting and<br>
> stopping the indexer? What drives whether the Admin
status page stays<br>
> Running, Stopped, etc. is the presence of the file:<br>
><br>
> /usr/share/eprints/var/indexer.pid<br>
><br>
> and whether there is an indexer process running with
the process ID<br>
> stored in this file. Also the presence of the file<br>
> /usr/share/eprints/var/indexer.tick may affect the
status you see. At<br>
> best guess the indexer is running but under a
different process ID to<br>
> that in indexer.pid. It should be noted that if your
run something like:<br>
><br>
> ps aux | grep indexer<br>
><br>
> You would get two processes back (three if you include
the "grep<br>
> indexer" process in the command above). The first is
the parent process<br>
> and this should have the process ID that is in
indexer.pid and the<br>
> second is a child process. The latter is vulnerable to
dying if the<br>
> indexer task it is undertaking fails in certain ways.
The parent<br>
> process should spawn a new child process if this
happens.<br>
><br>
> Normally what I would do to clear things up is stop the
indexer from the<br>
> command line. Then if any indexer processes are still
running use the<br>
> Unix kill command then kill these. Then finally make
sure that the<br>
> /usr/share/eprints/var/indexer.pid and<br>
> /usr/share/eprints/var/indexer.tick files are no longer
present and<br>
> delete if they are. Then I would go back to the web
interface to check<br>
> the indexer's status (to ensure it is stopped) and
hopefully then use<br>
> the Admin page's "Start Indexer" button to restart the
indexer. This<br>
> should get things back in a consistent state and
hopefully the=is<br>
> inconsistency will not re-occur.<br>
><br>
> Hope this helps. Please let me know if this does not
solve your problem.<br>
><br>
> Regards<br>
><br>
> David Newman<br>
><br>
> Subject: [3.4.2] Wrong status of indexer on the admin
site<br>
> From: systems <a class="moz-txt-link-rfc2396E" href="mailto:systems@mdc-berlin.de"><systems@mdc-berlin.de></a><br>
> Date: 27/01/2021, 07:28<br>
> To: <a class="moz-txt-link-rfc2396E" href="mailto:eprints-tech@ecs.soton.ac.uk"><eprints-tech@ecs.soton.ac.uk></a><br>
><br>
> Hi list,<br>
> I try to get eprints working on CentOS8.<br>
> As far it looks working, but the on the admin status
page, the indexer<br>
> is marked as stopped. But it runs and the task queue is
empty.<br>
><br>
> systemctl tells, that it is running and<br>
> sudo -u eprints /usr/share/eprints/bin/indexer status<br>
> also:<br>
> Indexer is running with PID 10960. Next index in 27
seconds<br>
><br>
> How will the status page check the state of the
indexer?<br>
><br>
><br>
> Thanks<br>
> for any hints.<br>
><br>
><br>
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<td style="width: 470px; padding-top: 12px; color: #41424e; font-size: 13px; font-family: Arial, Helvetica, sans-serif; line-height: 18px;">Virus-free. <a href="https://eur03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.avg.com%2Femail-signature%3Futm_medium%3Demail%26utm_source%3Dlink%26utm_campaign%3Dsig-email%26utm_content%3Demailclient&data=04%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7C696372d16c3948b2919c08d8c2bcbfa6%7C4a5378f929f44d3ebe89669d03ada9d8%7C0%7C0%7C637473463220019535%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=pBE%2B%2FvFFy6aJ%2FIG0s6xLH%2BzFTj5TxJQ2xsWlWVoGjBA%3D&reserved=0" originalSrc="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient" shash="X2A4poeB4H3PycwmoISK6Ul5uqgkK18HJVlIvO4zpddDIwGOnpRt8PhZcjeu2Zvd2Vknz+ztcQ3ZDWu9abnh69Owne/t/Y9xkyK+lgdOLAxfZQ7kBIEibpP23tZZZyHL+kC9Mhf2gHvegMEXhEYkCe49VVxbiID2S86VirqUKpk=" target="_blank" style="color: #4453ea;">www.avg.com</a>
</td>
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