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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">We'd be interested in this chat too.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">We're looking at possibly moving thumbnailing processes to Azure for our Digital Library (using blob storage / triggers when new things
are added).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">John<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> eprints-tech-bounces@ecs.soton.ac.uk [mailto:eprints-tech-bounces@ecs.soton.ac.uk]
<b>On Behalf Of </b>David R Newman via Eprints-tech<br>
<b>Sent:</b> 27 January 2021 12:12<br>
<b>To:</b> eprints-tech@ecs.soton.ac.uk; martin.braendle@uzh.ch; systems <systems@mdc-berlin.de><br>
<b>Subject:</b> Re: [EP-tech] Antwort: Re: [ext] Re: [3.4.2] Wrong status of indexer on the admin site<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>Hi Martin,<o:p></o:p></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.<o:p></o:p></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.<o:p></o:p></p>
<p>Regards<o:p></o:p></p>
<p>David Newman<o:p></o:p></p>
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<p class="MsoNormal">On 27/01/2021 11:32, Martin Braendle via Eprints-tech wrote:<o:p></o:p></p>
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<p><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Hi David,</span><br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">interesting thread. In our case, we have a three-server setup running on a shared file system.</span><br>
<span style="font-size:10.0pt;font-family:"Arial",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.</span><br>
<span style="font-size:10.0pt;font-family:"Arial",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.
</span><br>
<span style="font-size:10.0pt;font-family:"Arial",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).</span><br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",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?</span><br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Kind regards,</span><br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Martin</span><br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">--</span><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Dr. Martin Brändle</span><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Zentrale Informatik</span><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Universität Zürich</span><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Stampfenbachstr. 73</span><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">CH-8006 Zürich</span><br>
<br>
<br>
<img width="16" height="16" id="_x0000_i1025" src="cid:image001.gif@01D6F4CC.64B3D0A0" alt="Inactive hide details for "systems via
Eprints-tech" ---27/01/2021 12:02:49---CAUTION: This
e-mail originated outside the Unive"><span style="font-size:10.0pt;font-family:"Arial",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,</span><br>
<br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">Von: </span>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif">"systems via Eprints-tech"
<a href="mailto:eprints-tech@ecs.soton.ac.uk"><eprints-tech@ecs.soton.ac.uk></a></span><br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">An: </span>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif"><a href="mailto:eprints-tech@ecs.soton.ac.uk"><eprints-tech@ecs.soton.ac.uk></a></span><br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">Datum:
</span><span style="font-size:7.5pt;font-family:"Arial",sans-serif">27/01/2021 12:02</span><br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">Betreff:
</span><span style="font-size:7.5pt;font-family:"Arial",sans-serif">Re: [EP-tech] [ext] Re: [3.4.2] Wrong status of indexer on the admin site</span><br>
<span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#5F5F5F">Gesendet von:
</span><span style="font-size:7.5pt;font-family:"Arial",sans-serif"><a href="mailto:eprints-tech-bounces@ecs.soton.ac.uk"><eprints-tech-bounces@ecs.soton.ac.uk></a></span><o:p></o:p></p>
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<br>
<br>
<tt><span style="font-size:10.0pt">CAUTION: This e-mail originated outside the University of Southampton.</span></tt><span style="font-size:10.0pt;font-family:"Courier New""><br>
<br>
<tt>Hi David,</tt><br>
<tt>I only see the button "start indexer".</tt><br>
<tt>The page says that the indexer is stopped, but the indexer process is alive.</tt><br>
<br>
<tt>ps axu | grep $(cat /usr/share/eprints/var/indexer.pid)</tt><br>
<tt>eprints 6134 0.0 2.7 210776 50992 ? Ss 11:06 0:00</tt><br>
<tt>indexer</tt><br>
<br>
<tt>The indexer.tick exits and will contain:</tt><br>
<br>
<tt>cat /usr/share/eprints/var/indexer.tick</tt><br>
<tt># This file is by the indexer to indicate</tt><br>
<tt># that the indexer is still is_running.</tt><br>
<br>
<tt>When I stop the idexer via</tt><br>
<tt>systemctl stop epindexer</tt><br>
<br>
<tt>The pid and tick file is gone and no inder process is running now.</tt><br>
<tt>And the log if it says:</tt><br>
<tt>[Wed Jan 27 11:25:18 2021] 6134 *** Indexer sub-process stopped</tt><br>
<tt>[Wed Jan 27 11:25:18 2021] 6134 ** Indexer process stopping</tt><br>
<br>
<tt>It looks like, when the indexer is starte via the command line, then the</tt><br>
<tt>gui don't detect it and vice versa.</tt><br>
<br>
<tt>After starting it from the gui, the gui say the it will runs, but not</tt><br>
<tt>the console.</tt><br>
<br>
<tt>systemctl status epindexer</tt><br>
<tt>● epindexer.service - The eprints indexer</tt><br>
<tt> Loaded: loaded (/usr/lib/systemd/system/epindexer.service; static;</tt><br>
<tt>vendor preset: disabled)</tt><br>
<tt> Active: inactive (dead)</tt><br>
<br>
<br>
<br>
<tt>Am 27.01.21 um 10:42 schrieb David R Newman:</tt><br>
<tt>> Hi,</tt><br>
<tt>></tt><br>
<tt>> This is an interesting issue. When you go to the main Admin menu page</tt><br>
<tt>> under the System Tools tab what buttons are available for starting and</tt><br>
<tt>> stopping the indexer? What drives whether the Admin status page stays</tt><br>
<tt>> Running, Stopped, etc. is the presence of the file:</tt><br>
<tt>></tt><br>
<tt>> /usr/share/eprints/var/indexer.pid</tt><br>
<tt>></tt><br>
<tt>> and whether there is an indexer process running with the process ID</tt><br>
<tt>> stored in this file. Also the presence of the file</tt><br>
<tt>> /usr/share/eprints/var/indexer.tick may affect the status you see. At</tt><br>
<tt>> best guess the indexer is running but under a different process ID to</tt><br>
<tt>> that in indexer.pid. It should be noted that if your run something like:</tt><br>
<tt>></tt><br>
<tt>> ps aux | grep indexer</tt><br>
<tt>></tt><br>
<tt>> You would get two processes back (three if you include the "grep</tt><br>
<tt>> indexer" process in the command above). The first is the parent process</tt><br>
<tt>> and this should have the process ID that is in indexer.pid and the</tt><br>
<tt>> second is a child process. The latter is vulnerable to dying if the</tt><br>
<tt>> indexer task it is undertaking fails in certain ways. The parent</tt><br>
<tt>> process should spawn a new child process if this happens.</tt><br>
<tt>></tt><br>
<tt>> Normally what I would do to clear things up is stop the indexer from the</tt><br>
<tt>> command line. Then if any indexer processes are still running use the</tt><br>
<tt>> Unix kill command then kill these. Then finally make sure that the</tt><br>
<tt>> /usr/share/eprints/var/indexer.pid and</tt><br>
<tt>> /usr/share/eprints/var/indexer.tick files are no longer present and</tt><br>
<tt>> delete if they are. Then I would go back to the web interface to check</tt><br>
<tt>> the indexer's status (to ensure it is stopped) and hopefully then use</tt><br>
<tt>> the Admin page's "Start Indexer" button to restart the indexer. This</tt><br>
<tt>> should get things back in a consistent state and hopefully the=is</tt><br>
<tt>> inconsistency will not re-occur.</tt><br>
<tt>></tt><br>
<tt>> Hope this helps. Please let me know if this does not solve your problem.</tt><br>
<tt>></tt><br>
<tt>> Regards</tt><br>
<tt>></tt><br>
<tt>> David Newman</tt><br>
<tt>></tt><br>
<tt>> Subject: [3.4.2] Wrong status of indexer on the admin site</tt><br>
<tt>> From: systems <a href="mailto:systems@mdc-berlin.de"><systems@mdc-berlin.de></a></tt><br>
<tt>> Date: 27/01/2021, 07:28</tt><br>
<tt>> To: <a href="mailto:eprints-tech@ecs.soton.ac.uk"><eprints-tech@ecs.soton.ac.uk></a></tt><br>
<tt>></tt><br>
<tt>> Hi list,</tt><br>
<tt>> I try to get eprints working on CentOS8.</tt><br>
<tt>> As far it looks working, but the on the admin status page, the indexer</tt><br>
<tt>> is marked as stopped. But it runs and the task queue is empty.</tt><br>
<tt>></tt><br>
<tt>> systemctl tells, that it is running and</tt><br>
<tt>> sudo -u eprints /usr/share/eprints/bin/indexer status</tt><br>
<tt>> also:</tt><br>
<tt>> Indexer is running with PID 10960. Next index in 27 seconds</tt><br>
<tt>></tt><br>
<tt>> How will the status page check the state of the indexer?</tt><br>
<tt>></tt><br>
<tt>></tt><br>
<tt>> Thanks</tt><br>
<tt>> for any hints.</tt><br>
<tt>></tt><br>
<tt>></tt><br>
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