ActiveMQ won't restart because KahaDB is locked
Solution 1
Turns out there were multiple AMQ servers in our QA environment. When I shutdown the first server, an exception was thrown for some reason and so it didn't release the lock. Possession of that lock then went to the other AMQ instance (the first server was the master, the 2nd server was the slave).
When I tried restarting the first server (the master), it wouldn't restart because the 2nd server had possession of the lock. I shutdown the 2nd server and the lock was released, allowing me to restart them both.
Solution 2
Check the data/
directory for logs.
And is this a typo? :8161.admin
Try :8161/admin
Solution 3
- Go to your apache installation home folder in Win7 i.e. apache-activemq-X.XX.X
- Right click and select properties
- Change the access permission of this folder for your logged in user - "normally your logged in user should already have ADMIN access, but if you have this apache MQ unzipped on your machine, then admin permission would be missing"
Now, you should have activemq command running smoothly
IAmYourFaja
my father is a principal at burgoyne intnl and got me this job programming lisp and development. I aspire to unittesting with a concentration in mobile platforms.
Updated on June 04, 2022Comments
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IAmYourFaja about 2 years
Locally to start/stop ActiveMQ (5.6) on my dev machine I just run
./activemq start
and./activemq stop
respectively.On our QA machine we have it installed as a service and run
service activemq start
andservice activemq stop
respectively.I just went to bounce the QA machine and issued
service activemq stop
, thenservice activemq start
to restart it.I see a process ID being created, and if I run
ps -aef | grep activemq
I see the living, breathing process of an ActiveMQ server.But if I go to
http://<qa-server>:8161/admin
I get the typical error that you see when a server is down:Firefox can't establish a connection to the server at :8161.
Edit: I have now tried both the
./active start
andservice activemq start
methods, and both produce the same issue: I see a process being created, but nothing in the web admin tool.I checked ActiveMQ's home directory and don't see any type of
logs/
directory, so I'm not even sure where to begin debugging the issue.Either AMQ is not restarting, or its web admin app isn't restarting or functioning properly; either way I have no idea where to start. Thanks in advance!
Edit:
I see the following error in
data/activemq.log
:2012-10-07 11:37:14,501 | INFO | Database /qa-server/kahadb/lock is locked... waiting 10 seconds for the database to be unlocked. Reason: java.io.IOException: File '/qa-server/kahadb/lock' could not be locked. | org.apache.activemq.store.kahadb.MessageDatabase | main 2012-10-07 11:37:24,504 | INFO | Database /qa-server/kahadb/lock is locked... waiting 10 seconds for the database to be unlocked. Reason: java.io.IOException: File '/qa-server/kahadb/lock' could not be locked. | org.apache.activemq.store.kahadb.MessageDatabase | main