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From "Brian Desai (JIRA)" <>
Subject [jira] Created: (AMQ-1786) Journal files don't get cleaned up
Date Tue, 10 Jun 2008 14:27:00 GMT
Journal files don't get cleaned up

                 Key: AMQ-1786
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.1.0
         Environment: Linux server
Sun JDK 1.6.0

            Reporter: Brian Desai
            Priority: Critical
         Attachments: activemq.xml

I'm running ActiveMQ 5.1.0 with the AMQ persistence adapter, and it appears that not all of
the journal files get cleaned up.  My setup is a little abnormal, as I'm trying to test out
ActiveMQ's ability to handle queue messaging with consumers that may become inactive for periods
of time.
So for this test, I have a single publisher pushing messages out to 21 queues.  These are
persistent messages with an expiration time.  I have a message listener reading from all queues
(reading from '>').  So, as soon as the message is sent to the queues, it's read by the
message listener, taking it off the queue.  So far, so good.
I have a 2 MB max file length set on the AMQ persistence adapter.  So, I would expect to see
for the journal, 2 MB files that get cleaned up after the file rolls over.  However, the journal
files don't always get cleaned up, as shown in the file listing below.  Out of 181 rollovers,
30 of the files did not get cleaned up.  The message listener showed no errors, and as far
as I can tell, it didn't drop any messages.

-rw-r--r-- 1 root root  2096753 2008-05-30 20:30 data/journal/data-13
-rw-r--r-- 1 root root  2096967 2008-05-30 20:31 data/journal/data-14
-rw-r--r-- 1 root root  2096899 2008-05-30 20:45 data/journal/data-25
-rw-r--r-- 1 root root  2097057 2008-05-30 21:20 data/journal/data-52
-rw-r--r-- 1 root root  2096916 2008-05-30 21:22 data/journal/data-54
-rw-r--r-- 1 root root  2096536 2008-05-30 21:45 data/journal/data-72
-rw-r--r-- 1 root root  2096894 2008-05-30 21:47 data/journal/data-73
-rw-r--r-- 1 root root  2097129 2008-05-30 21:49 data/journal/data-75
-rw-r--r-- 1 root root  2097101 2008-05-30 21:58 data/journal/data-82
-rw-r--r-- 1 root root  2097026 2008-05-30 21:59 data/journal/data-83
-rw-r--r-- 1 root root  2096906 2008-05-30 22:02 data/journal/data-85
-rw-r--r-- 1 root root  2096973 2008-05-30 22:13 data/journal/data-94
-rw-r--r-- 1 root root  2097105 2008-05-30 22:24 data/journal/data-102
-rw-r--r-- 1 root root  2097033 2008-05-30 22:41 data/journal/data-113
-rw-r--r-- 1 root root  2096730 2008-05-30 22:42 data/journal/data-114
-rw-r--r-- 1 root root  2096569 2008-05-30 22:45 data/journal/data-116
-rw-r--r-- 1 root root  2096870 2008-05-30 22:50 data/journal/data-118
-rw-r--r-- 1 root root  2096567 2008-05-30 22:52 data/journal/data-119
-rw-r--r-- 1 root root  2096766 2008-05-30 23:03 data/journal/data-128
-rw-r--r-- 1 root root  2096877 2008-05-30 23:06 data/journal/data-130
-rw-r--r-- 1 root root  2096888 2008-05-30 23:18 data/journal/data-140
-rw-r--r-- 1 root root  2096699 2008-05-30 23:20 data/journal/data-141
-rw-r--r-- 1 root root  2096973 2008-05-30 23:22 data/journal/data-143
-rw-r--r-- 1 root root  2096924 2008-05-30 23:31 data/journal/data-150
-rw-r--r-- 1 root root  2096936 2008-05-30 23:45 data/journal/data-161
-rw-r--r-- 1 root root  2096527 2008-05-30 23:57 data/journal/data-170
-rw-r--r-- 1 root root  2097151 2008-05-30 23:58 data/journal/data-171
-rw-r--r-- 1 root root  2096972 2008-05-31 00:11 data/journal/data-179
-rw-r--r-- 1 root root  2096703 2008-05-31 00:13 data/journal/data-180
-rw-r--r-- 1 root root  2097069 2008-05-31 00:14 data/journal/data-181

I've also tried taking out the wildcard '>' on a single consumer, and instead used separate
consumers for each queue, and I get the same result.

I haven't even gotten to the test yet where the listener is not running.  So, in this "normal"
operation, all messages are consumed.  Yet, not all journal files get cleaned up.  These left-over
files don't ever get cleaned up.  They will eventually start filling the hard drive.  I can
understand files being left behind when there's no consumer, but there is a consumer the whole
What I'm basically looking for is a persistence layer for messaging to multiple clients, so
that consumers can get messages retroactively when they start up.  I could try to use topics
with durable clients, but I thought the queues would be easier to setup, as messages in queues
are persisted by default.  However, I don't want the consumer to process "stale" messages,
which is why I set an expiration time.  So, I would think that, with a constant rate of messages,
the persistent disk store utilization would eventually level out as the messages started to
expire.  I realize that if there's no consumer for a queue, expired messages won't get cleaned
up (am currently trying to figure out a work-around for that - periodically checking the queues
with a QueueBrowser seems to trigger the removal of expired messages).  However, even when
all consumers are active, the journal keeps growing, as it's not always cleaning up it's files!

I've attached my configuration to this ticket.

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