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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-12448" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-e3171a88-c34e-4ea4-9eb7-8c459a5a64f8" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12448" style="color: #3b73af; text-decoration: none">HHH-12448</a> </td>
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<td style="vertical-align: top;; padding: 0; 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://hibernate.atlassian.net/browse/HHH-12448" style="color: #3b73af; text-decoration: none">Possible memory leak in Envers due to Narayana Transaction Reaper</a> </span> </td>
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<td class="has-icon" style="padding: 0; 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-e3171a88-c34e-4ea4-9eb7-8c459a5a64f8" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="crancran" id="email_crancran" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=crancran" style="color:#6c797f;; color: #3b73af; text-decoration: none">Chris Cranford</a> </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core, hibernate-envers </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: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 30/Mar/2018 01:31 AM </td>
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<td class="has-icon" style="padding: 0; 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-major-c58f1089-ed1a-471d-8532-22afe7bd416a" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="ronaldmik" id="email_ronaldmik" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=ronaldmik" style="color:#6c797f;; color: #3b73af; text-decoration: none">Ronald Mik</a> </td>
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<table class="text-paragraph-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0; mso-table-rspace: 0; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 2px">
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">Hi,</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">As requested in the forum (post below) I have created this issue.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">In a JTA multi-threaded environment we are working on a project where we are processing large amounts of data. But we ran into a problem where it seems that our software is leaking memory. We analyzed the heapdumps and determined that it was Envers’s AuditProcessManager that was keeping data from being garbage collected.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Perhaps this issue should be posted in the Jboss/Narayana forums. I have been debugging and testing and determined that the cause lies in the fact that the transaction times out and the Transaction Reaper aborts the transaction at a point where Hibernate is not getting a chance to cleanup.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The issue seems to be related and/or originated in the following issue/fix: <span class="jira-issue-macro resolved" data-jira-key="HHH-7910"> <a href="https://hibernate.atlassian.net/browse/HHH-7910" class="jira-issue-macro-key issue-link" title="Transaction timeout can cause non-threadsafe session access by reaper thread" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12143&avatarType=issuetype"> HHH-7910 </a> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-success jira-macro-single-issue-export-pdf" style="background: #cccccc; border: 1px solid #cccccc; border-radius: 3px; color: #333333; display: inline-block; font-size: 11px; font-weight: bold; line-height: 99%; margin: 0; padding: 2px 5px; text-align: center; text-decoration: none; text-transform: uppercase; background-color: #ffffff; border-color: #cccccc; color: #333333" bgcolor="#ffffff">Closed</span> </span> </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I have tried to write it down as simple as possible. The following is happening (Note that the lock I am talking about is the _syncLock in TwoPhaseCoordinator):<br> Thread: work<br> Thread: flush. Envers registers beforeCompletion and afterCompletion on Session’s actionQueue (afterCompletion will do the cleanup)<br> Thread: doCommit<br> Thread: beforeCompletion -> lock -> Envers does its work<br> Reaper: abort transaction<br> Reaper: afterCompletion -> wait for lock<br> Thread: finds out transaction is rolled back and runs delayedAfterCompletion<br> Thread: ends beforeCompletion -> unlock<br> Reaper: gets lock, calls afterCompletion and finds out it is not the original Thread, thus sets delayedAfterCompletion.<br> Thread: afterCompletion -> wait for lock<br> Reaper: finishes afterCompletion -> unlock<br> Thread: gets lock and finds out afterCompletion has already been called (_afterCalled in TwoPhaseCoordinator) -> nothing to do and unlock</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Now Envers still has a reference to the audit-work in the Map in AuditProcessManager it is supposed to cleanup during afterCompletion, but it will never be called.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This issues has been found using an older version of Hibernate and Narayana, but I have tested this in a small example application with the latest version of Hibernate (5.2.15.Final) and the latest version of Narayana (5.8.0.Final) and I can reproduce the issue.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I have created a github-repository where I have pushed my test application: <a href="https://github.com/ronaldmik/memoryleak" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/ronaldmik/memoryleak</a></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Any help would be appreciated. If this should (also) be posted in the Jboss/Narayana forums, let me know.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Thanks in advance!</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Forum post: <a href="https://discourse.hibernate.org/t/possible-memory-leak-in-envers-due-to-narayana-transaction-reaper/463" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://discourse.hibernate.org/t/possible-memory-leak-in-envers-due-to-narayana-transaction-reaper/463</a></p> </td>
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