Red Hat Bugzilla – Bug 871610
JMX Plugin - Leaking connector threads - com.sun.jmx.remote.internal.ClientCommunicatorAdminClientCommunicatorAdmin$Checker.run
Last modified: 2015-02-01 18:28:28 EST
+++ This bug was initially created as a clone of Bug #848938 +++
Description of problem:
Number of process threads increases over time.
One such example:
"Thread-2461" daemon prio=10 tid=0x000000006103c800 nid=0x5fc0 waiting on condition [0x00002aab178bb000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
Version-Release number of selected component (if applicable):
RHQ 4.4 version of the plugin running.
Unclear what specific conditions cause this in my case, but I have seen it almost universally. It could be to discovery failing.
There are obvious code paths which can likely lead to this condition worth exploring.
> When you do:
> Make sure to close it when you're done using it rather than leaving it up to garbage collection or it seems they can keep piling up...
There are two instances where close is never called:
1) Getting Java version
2) Getting Java PID
** patch forthcoming
--- Additional comment from firstname.lastname@example.org on 2012-09-13 18:01:15 EDT ---
Created attachment 612647 [details]
fixes connection leak patch
--- Additional comment from email@example.com on 2012-09-19 06:55:33 EDT ---
Tried applying the patch - it failed on current master (which is 6887631b) - please correct and re-attach to this BZ. Here's the error I get:
$ git am ~/Downloads/0001-Bug-848938-JMX-Plugin-Leaking-connector-thread.patch
Applying: Bug 848938 - JMX Plugin - Leaking connector thread
error: patch failed: modules/plugins/jmx/src/main/java/org/rhq/plugins/jmx/JMXDiscoveryComponent.java:335
error: modules/plugins/jmx/src/main/java/org/rhq/plugins/jmx/JMXDiscoveryComponent.java: patch does not apply
Patch failed at 0001 Bug 848938 - JMX Plugin - Leaking connector thread
--- Additional comment from firstname.lastname@example.org on 2012-09-19 12:01:58 EDT ---
Created attachment 614447 [details]
updated patch against master - 9f175839392
--- Additional comment from email@example.com on 2012-09-19 12:30:42 EDT ---
git commit to master: 26b37482f90fb01a6771c5c51471e2754dc3cdb4
--- Additional comment from firstname.lastname@example.org on 2012-10-30 16:51:33 EDT ---
Set Target Release correctly.
Waiting to be cherry-picked to the release/jon31x branch
cherry picked to release/jon3.1.x branch: 7aa947262aba8dd3bbebeea9243165b659e11e5e
had to correct minor conflicts - no code conflicts, just comments
Moving this to ON_QA as available for testing in https://brewweb.devel.redhat.com//buildinfo?buildID=243389.
no repro steps
unclear what causes this
marking verified based on developer code review ... low risk. adding close() in several spots.
plugins will be regression tested as part of JON 3.1.2.