<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div>We have found a workaround that eliminates the leftover event (gone from Working Memory, but not from the JVM memory): </div><div><br></div><div>The rule “forget it ever happened” (seen below) causes the problem. Re-writing it to remove the check for RAISE in the LHS eliminated the memory leak. Of course, our application requires the check for RAISE, so it can be accomplished by manually querying working memory from the RHS. It’s ugly, but it resolved the issue.</div><div><br></div><div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span style="color: #a91500">query</span> existsRaise($id)</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>$raise : MyEvent( eventState == EventState.RAISE, eventId == $id )</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">end</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; min-height: 15px;"><br></div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(0, 143, 0);"><span style="color: #a91500">rule</span><span style="color: #000000"> </span>"process clear"</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);"><span style="color: #000000"><span class="Apple-tab-span" style="white-space:pre"> </span></span>no-loop</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">when</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>$clear : MyEvent(eventState == EventState.CLEAR, $clearId : eventId)</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">then</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>QueryResults results = kcontext.getKieRuntime().getQueryResults( <span style="color: #008f00">"existsRaise"</span>, $clearId );</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span><span style="color: #a91500">if</span> (results.size() == 0) { </div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.println( <span style="color: #008f00">"Forwarding CLEAR("</span> + $clearId + <span style="color: #008f00">")"</span> ); </div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>} <span style="color: #a91500">else</span> {</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"> <span class="Apple-tab-span" style="white-space:pre"> </span>System.out.println(<span style="color: #008f00">"Forgetting RAISE/CLEAR("</span> + $clearId + <span style="color: #008f00">")"</span>);</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span> <span style="color: #a91500">for</span> (QueryResultsRow row : results){</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"> <span class="Apple-tab-span" style="white-space:pre"> </span><span class="Apple-tab-span" style="white-space:pre"> </span>MyEvent raise = (MyEvent) row.get (<span style="color: #008f00">"$raise"</span>);</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"> <span class="Apple-tab-span" style="white-space:pre"> </span>delete(raise);</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>}</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>}</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>delete($clear);</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">end</div></div><div><br></div><div>This appears to be a similar situation to <a href="https://issues.jboss.org/browse/DROOLS-498">https://issues.jboss.org/browse/DROOLS-498</a>.</div><div><br></div><div><br></div><br><div><div>On Jul 10, 2014, at 3:54 PM, Kent Anderson <<a href="mailto:kent.anderson@psware.com">kent.anderson@psware.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><meta http-equiv="Content-Type" content="text/html charset=windows-1252"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Correction: The original post did not include another rule that exists in the stream. The memory leak does not appear unless both rules are active in the stream.<div><br></div><div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span style="color: #a91500">declare</span> MyEvent </div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"> @role(event) </div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"> @timestamp(timestamp) </div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">end<span style=""> </span></div></div><div><br></div><div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(146, 144, 0);">/* If a RAISE is buffered for N seconds, send it out */</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(0, 143, 0);"><span style="color: #a91500">rule</span><span style=""> </span>"forward raise"</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);"><span style=""><span class="Apple-tab-span" style="white-space:pre"> </span></span>no-loop</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);"><span style=""><span class="Apple-tab-span" style="white-space:pre"> </span></span>duration<span style=""> (3s)</span></div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">when</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>$raise : MyEvent(eventState == EventState.RAISE, $raiseId : eventId)</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">then</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.println(<span style="color: #008f00">"Forwarding RAISE("</span> + $raiseId + <span style="color: #008f00">")"</span>);</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>delete($raise);</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">end</div></div><div><br></div><div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(146, 144, 0);">/* When CLEAR, and buffered, clear them both out */</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(0, 143, 0);"><span style="color: #a91500">rule</span><span style=""> </span>"forget it ever happened"</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);"><span style=""><span class="Apple-tab-span" style="white-space:pre"> </span></span>no-loop</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">when</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>$clear : MyEvent(eventState == EventState.CLEAR, $clearId : eventId)</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>$raise : MyEvent(eventState == EventState.RAISE, eventId == $clearId)</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">then</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.println(<span style="color: #008f00">"Forgetting RAISE/CLEAR("</span> + $clearId + <span style="color: #008f00">")"</span>);</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>delete($clear);</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>delete($raise);</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">end</div></div><div><br></div><div><br><div><div>On Jul 10, 2014, at 2:50 PM, Kent Anderson <<a href="mailto:kent.anderson@psware.com">kent.anderson@psware.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">The following rule produces a memory leak in Drools 6.1.0-SNAPSHOT:<div><br></div><div>(Stream mode)</div><div><br></div><div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span style="color: #a91500">declare</span> MyEvent </div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"> @role(event) </div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"> @timestamp(timestamp) </div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">end<span style=""> </span></div></div><div><br></div><div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(146, 144, 0);">/* If a RAISE is buffered for N seconds, send it out */</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(0, 143, 0);"><span style="color: #a91500">rule</span><span style=""> </span>"forward raise"</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);"><span style=""><span class="Apple-tab-span" style="white-space:pre"> </span></span>no-loop</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);"><span style=""><span class="Apple-tab-span" style="white-space:pre"> </span></span>duration<span style=""> (3s)</span></div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">when</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>$raise : MyEvent(eventState == EventState.RAISE, $raiseId : eventId)</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">then</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>System.out.println(<span style="color: #008f00">"Forwarding RAISE("</span> + $raiseId + <span style="color: #008f00">")"</span>);</div><div style="margin: 0px; font-size: 11px; font-family: Monaco;"><span class="Apple-tab-span" style="white-space:pre"> </span>delete($raise);</div><div style="margin: 0px; font-size: 11px; font-family: Monaco; color: rgb(169, 21, 0);">end</div></div><div><br></div><div><br></div><div>I see the rule fire as expected, printing out the message 3 seconds after the event is added into the session. While the event is waiting, I see a FactCount of 1 in the session. After the rule fires, the fact count goes to 0. However, using JVisualVm, querying the heap dump shows 1 instance of MyEvent, referenced by an EventFactHandle and several other Drools objects.</div><div><br></div><div>Is this a bug, or is there a better way to write this rule so Drools’ internals let go of the object after it is no longer a fact?</div><div><br></div><div><span><PastedGraphic-1.png></span></div><div><br></div><div><span><PastedGraphic-2.png></span></div></div>_______________________________________________<br>rules-users mailing list<br><a href="mailto:rules-users@lists.jboss.org">rules-users@lists.jboss.org</a><br><a href="https://lists.jboss.org/mailman/listinfo/rules-users">https://lists.jboss.org/mailman/listinfo/rules-users</a></blockquote></div><br></div></div>_______________________________________________<br>rules-users mailing list<br><a href="mailto:rules-users@lists.jboss.org">rules-users@lists.jboss.org</a><br>https://lists.jboss.org/mailman/listinfo/rules-users</blockquote></div><br></body></html>