[jboss-jira] [JBoss JIRA] (JGRP-1834) ProbeHandler memory leak when enable_diagnostics=false

[Bela Ban (JIRA)]

     [ https://issues.jboss.org/browse/JGRP-1834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bela Ban resolved JGRP-1834.
----------------------------

    Resolution: Done


Fixed on master and 3.4

> ProbeHandler memory leak when enable_diagnostics=false
> ------------------------------------------------------
>
>                 Key: JGRP-1834
>                 URL: https://issues.jboss.org/browse/JGRP-1834
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 3.2.12
>            Reporter: Dennis Reed
>            Assignee: Bela Ban
>             Fix For: 3.4.4, 3.5
>
>
> There is a memory leak in TP#preregistered_probe_handlers when enable_diagnostics is false.
> TP#registerProbeHandler stores ProbeHandlers in the preregistered_probe_handlers list if diag_handler is null (either because TP has not been started, or enable_diagnostics is false).
> When TP is started, if enable_diagnostics is true it copies them to the diag_handler and clears out preregistered_probe_handlers.
> But if enable_diagnostics is false, preregistered_probe_handlers will never get cleared.
> This prevents anything that registered a probe handler from being GC'd.  For example with a shared JGroups transport like EAP uses, this can cause an Infinispan CacheManager that has been stopped to never get GC'd.
> (This issue was noticed because of a buildup of DefaultCacheManager instances in a heap dump after an application had been redeployed a few times).



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