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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://dev.majordodo.org/jira/browse/MAJ" style="color: #3b73af; text-decoration: none">Majordodo</a> / <a href="https://dev.majordodo.org/jira/browse/MAJ-72" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-2674c4de-aef7-4176-8101-e4a380a469c2" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom"></a> <a href="https://dev.majordodo.org/jira/browse/MAJ-72" style="color: #3b73af; text-decoration: none">MAJ-72</a> </td>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://dev.majordodo.org/jira/browse/MAJ-72" style="color: #3b73af; text-decoration: none">Constaints on custom resources</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-2674c4de-aef7-4176-8101-e4a380a469c2" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom"> New Feature </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 0.5.0 </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Assignee:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="eolivelli" id="email_eolivelli" href="https://dev.majordodo.org/jira/secure/ViewProfile.jspa?name=eolivelli" style="color:#3b73af;; color: #3b73af; text-decoration: none">Enrico Olivelli</a> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Components:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Broker </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 25/Jul/16 10:11 AM </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Fix Versions:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 0.6.0 </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Priority:</th>
<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-medium-7a566c00-bdfa-47f2-b246-310544e0d879" height="16" width="16" border="0" align="absmiddle" alt="Medium" style="vertical-align: text-bottom"> Medium </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="eolivelli" id="email_eolivelli" href="https://dev.majordodo.org/jira/secure/ViewProfile.jspa?name=eolivelli" style="color:#3b73af;; color: #3b73af; text-decoration: none">Enrico Olivelli</a> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Original Estimate:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">1 week</td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Remaining Estimate: </th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">1 week</td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">The idea is to let the user put limits on usage of external ("custom") resources.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">For instance you have a database and the total number of active connections must not be greater than a given limit.<br> This configuration maps to having a limit on overall the number of tasks which could use the datasource.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Another case is that you have a per-worker limit on the maximum number of connections to the given datasource. If a task arrives to the worker it will be blocked waiting for the connection pool to return a connection, this is a waste of time: the broker thinks that the worker is working but actually it is not.<br> This problem maps to having a per-worker limit of number of tasks which could use the datasource.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">An idea for implementation is:</p>
<ul class="alternate" type="square">
<li>each resource as a string ID (case-sensitive, possibly very "short")</li>
<li>let the client assign custom "resources" to every task, in the form if Set<String> (implementation will use an ordered String[] or other optmized format)</li>
<li>let the worker send its own limits on resources (as it already happens againts the number of active threads) <span class="error">[per-worker limit]</span></li>
<li>on the broker we can configure a per-resource limit (this is to be implemented using a function, for dynamic reconfiguration)</li>
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