Details
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Bug
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Resolution: Done
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Blocker
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7.0.0.DR10
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None
Description
The ManagedServerProxy class in the host-controller module contains a memory leak, which can be easily reproduced using the RBAC soak test, like so:
cd wildfly-core # checkout WildFly Core 2.0.0.CR1, which is in EAP 7.0.0.DR10, or current master mvn clean install -DskipTests cd testsuite/domain mvn clean test -Dts.noSmoke -Dts.domain -Prbac-soak -Djboss.test.rbac.soak.clients=100 -Djboss.test.rbac.soak.iterations=50
After acquiring a heap dump (-XX:+HeapDumpOnOutOfMemoryError), it's clear that out of the 512 MB of heap space a host controller has, more than 400 MB is taken by a single instance of the ManagedServerProxy class, specifically by its activeRequests field. This Map has a single entry whose value is a Set of "pending" futures. I added a couple of debug prints to the places where this Set is modified, only to see this:
2015-09-21 12:32:00,704 INFO [stdout] (management-handler-thread - 4) !!! added org.jboss.as.controller.remote.TransactionalProtocolClientImpl$1@142a1c24 2015-09-21 12:32:00,707 INFO [stdout] (Remoting "master:MANAGEMENT" task-3) !!! removed org.jboss.as.protocol.mgmt.ActiveOperationSupport$ActiveOperationImpl@5bfbf423 2015-09-21 12:32:00,707 INFO [stdout] (management-handler-thread - 4) !!! added org.jboss.as.controller.remote.TransactionalProtocolClientImpl$1@27e2e96c 2015-09-21 12:32:00,708 INFO [stdout] (Remoting "master:MANAGEMENT" task-2) !!! removed org.jboss.as.protocol.mgmt.ActiveOperationSupport$ActiveOperationImpl@72817a0d 2015-09-21 12:32:00,713 INFO [stdout] (management-handler-thread - 2) !!! added org.jboss.as.controller.remote.TransactionalProtocolClientImpl$1@73d373a7 2015-09-21 12:32:00,718 INFO [stdout] (Remoting "master:MANAGEMENT" task-9) !!! removed org.jboss.as.protocol.mgmt.ActiveOperationSupport$ActiveOperationImpl@20bd6db1
Skipping a few intermediate steps, the root cause is that AbstractDelegatingAsyncFuture delegates addListener directly to an underlying future, so the callbacks don't get the original instance, but the underlying one.
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