<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">Which services are connecting to database in processEvent method ?</div><div class="">That would be wrong.</div><div class=""><br class=""></div><div class="">Gagik</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Nov 8, 2017, at 2:43 PM, Vardan Gyurjyan <<a href="mailto:gurjyan@jlab.org" class="">gurjyan@jlab.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=us-ascii" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi,<div class="">
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<!--[if gte mso 10]>
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<!--StartFragment--><p class="MsoNormal">Rebooting will not solve the problem. The problem is in the engine design. </p><p class="MsoNormal">I think the problem is a that service configuration is done
in the processEvent() method of the engine, instead of init() method. Since
processEvent() is scaled by Clara over multiple threads, we are getting
multiple database accesses for a single service (higher scaling, higer the
number of database accesses). Also, not always database is properly closed.
Below is an example of a production using a single service. Note that this is service
independent and the solution would be to move service configuration to Clara
configure() transaction (user engine init() method).<o:p class=""></o:p></p><p class="MsoNormal"><o:p class="">Best,</o:p></p><p class="MsoNormal"><o:p class="">-vardan </o:p> </p><p class="MsoNormal"><o:p class=""></o:p></p><p class="MsoNormal">YAML<o:p class=""></o:p></p><p class="MsoNormal">io-services:<o:p class=""></o:p></p><p class="MsoNormal"> reader:<o:p class=""></o:p></p><p class="MsoNormal"> class:
org.jlab.clas.std.services.convertors.HipoToHipoReader<o:p class=""></o:p></p><p class="MsoNormal"> name:
HipoToHipoReader<o:p class=""></o:p></p><p class="MsoNormal"> writer:<o:p class=""></o:p></p><p class="MsoNormal"> class:
org.jlab.clas.std.services.convertors.HipoToHipoWriter<o:p class=""></o:p></p><p class="MsoNormal"> name:
HipoToHipoWriter<o:p class=""></o:p></p><p class="MsoNormal">services:<o:p class=""></o:p></p><p class="MsoNormal"> data-processing:<o:p class=""></o:p></p><p class="MsoNormal"> chain:<o:p class=""></o:p></p><p class="MsoNormal"> - class:
org.jlab.service.dc.DCHBEngine<o:p class=""></o:p></p><p class="MsoNormal"> name: DCHB<o:p class=""></o:p></p><p class="MsoNormal">mime-types:<o:p class=""></o:p></p><p class="MsoNormal"> - binary/data-hipo<o:p class=""></o:p></p><p class="MsoNormal"><o:p class=""> </o:p> </p><p class="MsoNormal">Single thread execution.<o:p class=""></o:p></p><p class="MsoNormal"><o:p class=""> </o:p>vem:log gurjyan$ cat 129.57.75.136_gurjyan_clara_fe_dpe.log
| grep mysql</p><p class="MsoNormal"><o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> open
connection with : <a href="mysql://clas12reader@clasdb.jlab.org/clas12" class="">mysql://clas12reader@clasdb.jlab.org/clas12</a><o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> open
connection with : <a href="mysql://clas12reader@clasdb.jlab.org/clas12" class="">mysql://clas12reader@clasdb.jlab.org/clas12</a><o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> open
connection with : <a href="mysql://clas12reader@clasdb.jlab.org/clas12" class="">mysql://clas12reader@clasdb.jlab.org/clas12</a><o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> open
connection with : <a href="mysql://clas12reader@clasdb.jlab.org/clas12" class="">mysql://clas12reader@clasdb.jlab.org/clas12</a><o:p class=""></o:p></p><p class="MsoNormal">vem:log gurjyan$ cat 129.57.75.136_gurjyan_clara_fe_dpe.log
| grep disconnect<o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> database
disconnect : success<o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> database
disconnect : success<o:p class=""></o:p></p><p class="MsoNormal"><o:p class=""> </o:p></p><p class="MsoNormal">2 thread execution<o:p class=""></o:p></p><p class="MsoNormal"><o:p class=""> </o:p>vem:log gurjyan$ cat 129.57.75.136_gurjyan_clara_fe_dpe.log
| grep mysql</p><p class="MsoNormal"><o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> open
connection with : <a href="mysql://clas12reader@clasdb.jlab.org/clas12" class="">mysql://clas12reader@clasdb.jlab.org/clas12</a><o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> open
connection with : <a href="mysql://clas12reader@clasdb.jlab.org/clas12" class="">mysql://clas12reader@clasdb.jlab.org/clas12</a><o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> open
connection with : <a href="mysql://clas12reader@clasdb.jlab.org/clas12" class="">mysql://clas12reader@clasdb.jlab.org/clas12</a><o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> open
connection with : <a href="mysql://clas12reader@clasdb.jlab.org/clas12" class="">mysql://clas12reader@clasdb.jlab.org/clas12</a><o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> open
connection with : <a href="mysql://clas12reader@clasdb.jlab.org/clas12" class="">mysql://clas12reader@clasdb.jlab.org/clas12</a><o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> open
connection with : <a href="mysql://clas12reader@clasdb.jlab.org/clas12" class="">mysql://clas12reader@clasdb.jlab.org/clas12</a><o:p class=""></o:p></p><p class="MsoNormal">vem:log gurjyan$ cat 129.57.75.136_gurjyan_clara_fe_dpe.log
| grep disconnect<o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> database
disconnect : success<o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> database
disconnect : success<o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> database
disconnect : success<o:p class=""></o:p></p><p class="MsoNormal">[DB] ---> database
disconnect : success<o:p class=""></o:p></p>
<!--EndFragment--><div class="">
<div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">---------------------------------------------------<br class="">Vardan H. Gyurjyan, Ph.D.<br class="">Staff Scientist<br class="">Thomas Jefferson Accelerator Facility<br class="">Newport News, VA, 23606<br class="">E-mail: <a href="mailto:gurjyan@jlab.org" class="">gurjyan@jlab.org</a><br class="">757-269-5879 (JLAB)<br class=""><br class=""><br class=""></div>
</div>
<br class=""><div class=""><blockquote type="cite" class=""><div class="">On Nov 8, 2017, at 2:12 PM, Harout Avakian <<a href="mailto:avakian@jlab.org" class="">avakian@jlab.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
<meta http-equiv="content-type" content="text/html; charset=utf-8" class="">
<div text="#000000" bgcolor="#FFFFFF" class=""><p class="">Dear All,</p><p class="">We were having problems with the mysql server. Marty will reboot
the system.</p><p class="">Harut<br class="">
</p>
<div class="moz-forward-container"><br class="">
<br class="">
-------- Forwarded Message --------
<table class="moz-email-headers-table" border="0" cellspacing="0" cellpadding="0">
<tbody class="">
<tr class="">
<th nowrap="nowrap" valign="BASELINE" align="RIGHT" class="">Subject:
</th>
<td class="">RE: clasdb</td>
</tr>
<tr class="">
<th nowrap="nowrap" valign="BASELINE" align="RIGHT" class="">Date: </th>
<td class="">Wed, 8 Nov 2017 14:08:13 -0500 (EST)</td>
</tr>
<tr class="">
<th nowrap="nowrap" valign="BASELINE" align="RIGHT" class="">From: </th>
<td class="">Marty Wise <a class="moz-txt-link-rfc2396E" href="mailto:wise@jlab.org"><wise@jlab.org></a></td>
</tr>
<tr class="">
<th nowrap="nowrap" valign="BASELINE" align="RIGHT" class="">To: </th>
<td class="">Harout Avakian <a class="moz-txt-link-rfc2396E" href="mailto:avakian@jlab.org"><avakian@jlab.org></a></td>
</tr>
<tr class="">
<th nowrap="nowrap" valign="BASELINE" align="RIGHT" class="">CC: </th>
<td class="">Nathan Baltzell <a class="moz-txt-link-rfc2396E" href="mailto:baltzell@jlab.org"><baltzell@jlab.org></a></td>
</tr>
</tbody>
</table>
<br class="">
<br class="">
<pre class="">OK. Proceeding with the reboot now. Will let you know when it's back.
Marty Wise (<a class="moz-txt-link-abbreviated" href="mailto:wise@jlab.org">wise@jlab.org</a> <a class="moz-txt-link-rfc2396E" href="mailto:wise@jlab.org"><mailto:wise@jlab.org></a> )
JLab IT/CNI
>>> On Nov 8, 2017, at 14:00, Marty Wise <a class="moz-txt-link-rfc2396E" href="mailto:wise@jlab.org"><wise@jlab.org></a> wrote:
>>>
>>> Nathan and Harout,
>>>
>>> I was working on an email to you with some details and a suggestion
>>> that we should reboot the system as soon as possible. It had been
>>> seeing arodun 1000 connections. When I check now, though, it has only
>>> 9 active connections. Did you do something to kill jobs/connections?
>>>
>>> Does this lull give us a chance at a reboot?
>>>
>>> Marty Wise (<a class="moz-txt-link-abbreviated" href="mailto:wise@jlab.org">wise@jlab.org</a> <a class="moz-txt-link-rfc2396E" href="mailto:wise@jlab.org"><mailto:wise@jlab.org></a> ) JLab IT/CNI
>>>
>>>
</pre>
</div>
</div>
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