Re: ActiveMQ crashes frequently

fenbers Sun, 02 Jun 2013 05:35:59 -0700

  
    
  
  
    I don't know how to determine the NFS version but we are running on
    RHEL 5.5. 
    
    I have not checked the syslog.&nbsp; Thanks for the tip.&nbsp; I will do 
that
    after our morning Operations. 
    
    We are also very inclined to believe this is an NFS issue, based on
    behaviors network-wide which have nothing to do with ActiveMQ, e.g,
    often taking 10 seconds to list just 5 files in an NFS-mounted
    directory. 
    
    So, we are creating an action plan this weekend to eliminate as many
    NFS mount points as possible, and seeing how that helps the
    situation.&nbsp; The plan needs approval/buy-in from key people to be
    implemented, so it may be a couple of weeks to implement the plan.&nbsp;
    In the meantime, ActiveMQ either shuts itself down or behaves in
    rather despondent ways, so we find we are having to restart ActiveMQ
    every 3 or 4 hours (and this frequency is slowly increasing). 
    
    Once ActiveMQ is rebooted, we find that our producers and our
    consumers have to be shut down and relaunched in order to
    reestablish the connection with ActiveMQ.&nbsp; This is a royal pain!&nbsp;
    However, a producer will throw an exception whenever it tries to
    send a message through a lost connection, and so I catch the
    exception where I close the connection and reopen it.&nbsp; Thus, my
    producers are able to reconnect automatically in the event ActiveMQ
    is restarted. 
    
    But with the consumers, no exception is thrown as it waits for
    notifications.&nbsp; It simply waits for a notification that never
    happens after the connection with ActiveMQ is lost.&nbsp; So what is your
    recommended method for a consumer to check for a disconnection??&nbsp;
    (Maybe I should post his question as a separate thread...) 
    
    Mark 
    
    
    On 5/29/2013 3:21 AM, rajdavies [via
      ActiveMQ] wrote: 
    
     Ultimately I'm pretty confident this problem is an
      NFS problem &nbsp;- and as Johan has already let the cat out of the bag
      ;) - let me ask the following:
      
      
      &nbsp;Which version of NFS 4 are you using and which environment?
      
      &nbsp;Have you checked the system logs for NFS errors on all the
      machines running ActiveMQ brokers ?
      
      
      thanks,
      
      
      Rob
      
      
      On 29 May 2013, at 00:46, Christian Posta &lt; [hidden email] &gt;
      wrote:
      
      
        &gt; I can make two recommendations.
        
        &gt; 
        &gt; #1, being the preferred, create a test case that shows
        this... that will
        
        &gt; give us the best chance of finding out what's going on...
        take a look at
        
        &gt; the following test cases in the activemq source code to
        give you an idea
        
        &gt; about how to go about doing it...
        
        &gt; 
        &gt; 
http://svn.apache.org/viewvc/activemq/trunk/activemq-unit-tests/src/test/java/org/apache/activemq/usecases/
 
        &gt; 
        &gt; 
http://svn.apache.org/viewvc/activemq/trunk/activemq-unit-tests/src/test/java/org/apache/activemq/bugs/
 
        &gt; 
        &gt; 
http://svn.apache.org/viewvc/activemq/trunk/activemq-unit-tests/src/test/java/org/apache/activemq/test/JmsTopicSendReceiveTest.java?view=markup
 
        &gt; 
        &gt; 
        &gt; #2, if creating a test case doesn't sound like something
        you want to get
        
        &gt; into.. i guess, give us the exact configs of broker,
        clients, number of
        
        &gt; consumers, number of topics, message sizes, etc, etc all
        details and if one
        
        &gt; of us gets the urge we can try it out on our boxes. this
        will not be nearly
        
        &gt; as good as #1, and will provide a higher barrier to entry
        because we spend
        
        &gt; our spare time doing this and like to spend that time
        debugging and fixing,
        
        &gt; and not setting up environments and usecases which may not
        even show a bug
        
        &gt; :)
        
        &gt; 
        &gt; 
        &gt; 
        &gt; 
        &gt; On Tue, May 28, 2013 at 4:34 PM, fenbers &lt; [hidden email] &gt;
        wrote:
        
        &gt; 
        &gt;&gt; 
        &gt;&gt; 
        &gt;&gt; 
        &gt;&gt; 
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp;I'm getting the Sync exception on both, local and
        NFS.&amp;nbsp;
        
        &gt;&gt; Originally,
        
        &gt;&gt; &nbsp; &nbsp;I was only using a local disk, but there wasn't 
much
        disk space for
        
        &gt;&gt; &nbsp; &nbsp;the ever growing list of 33MB enumerated .log 
files
        that weren't
        
        &gt;&gt; &nbsp; &nbsp;cleaned up.&amp;nbsp; So I reconfigured ActiveMQ 
to
        put these db files on
        
        &gt;&gt; an
        
        &gt;&gt; &nbsp; &nbsp;NFS mount.&amp;nbsp; But the sync exceptions
        occurred either way.
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp;I've changed *all* my consumers to 
AUTO_ACKNOWLEDGE,
        thinking that
        
        &gt;&gt; &nbsp; &nbsp;maybe an ACKNOWLEDGEment leak was causing the
        undeleted files.&amp;nbsp;
        
        &gt;&gt; That
        
        &gt;&gt; &nbsp; &nbsp;didn't help...&amp;nbsp; The TRACE level logging
        points to only two of my 5
        
        &gt;&gt; &nbsp; &nbsp;topics that accumulate these undeleted db
        files.&amp;nbsp; So I've
        
        &gt;&gt; &nbsp; &nbsp;concentrated by scrutiny over consumers of these 
two
        topics.&amp;nbsp; But
        
        &gt;&gt; &nbsp; &nbsp;have not found anything out of the
        ordinary.&amp;nbsp;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp;What is puzzling me still, is that the frequency 
of
        the log file
        
        &gt;&gt; &nbsp; &nbsp;build-up and the frequency of exceptions continues
        to increase even
        
        &gt;&gt; &nbsp; &nbsp;though the amount of messages sent per day by the
        producers remains
        
        &gt;&gt; &nbsp; &nbsp;nearly constant...
        
        &gt;&gt; &nbsp; &nbsp;Mark
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp;On 5/28/2013 6:06 PM, ceposta [via
        
        &gt;&gt; &nbsp; &nbsp; &nbsp;ActiveMQ] wrote:
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; Sounds like there's multiple issues...
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp;You're journal files aren't being cleaned 
up, AND
        you're getting
        
        &gt;&gt; &nbsp; &nbsp; &nbsp;the Sync
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp;exception?
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp;You get the sync exception on local disk 
mount? Or
        just NFS?
        
        &gt;&gt; 
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp;If the journals aren't being cleaned up, 
are your
        consumers
        
        &gt;&gt; &nbsp; &nbsp; &nbsp;properly
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp;ack'ing messages?
        
        &gt;&gt; 
        &gt;&gt; 
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp;On Tue, May 28, 2013 at 2:42 PM, fenbers 
&amp;lt;
        [hidden email] &amp;gt;
        
        &gt;&gt; &nbsp; &nbsp; &nbsp;wrote:
        
        &gt;&gt; 
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; I 
would LOVE to
        help you help me!&amp;amp;nbsp; But
        
        &gt;&gt; I have
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;no idea how to go
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
about making a
        test case.&amp;amp;nbsp; If you
        
        &gt;&gt; could drop
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;some hints in this
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
regard, I might
        be able to produce one.
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; My 
ActiveMQ
        issues seem to be related to network
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;slowness, which we
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; are 
diagnosing
        separately.&amp;amp;nbsp; Or maybe
        
        &gt;&gt; it is the
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;other way around,
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
where ActiveMQ
        problems are causing network
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;sluggishness.&amp;amp;nbsp; Either
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; way, 
there seems
        to be a correlation, except
        
        &gt;&gt; that when
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;network
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
responsiveness
        improves, ActiveMQ does not.
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; The 
problem I'm
        having with AMQ is progressive,
        
        &gt;&gt; which
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;is even more
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
puzzling, because
        we are not adding to the
        
        &gt;&gt; number of
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;messages that
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; AMQ 
has to
        handle.&amp;amp;nbsp; Today, we were up
        
        &gt;&gt; to 191
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;undeleted db-NNN.log
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
files in the
        database directory before I
        
        &gt;&gt; stopped AMQ
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;and deleted
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp;
        them.&amp;amp;nbsp;&amp;amp;nbsp; NNN was up to 451, so
        
        &gt;&gt; 260
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;files had been cleaned up
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; by AMQ's
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
automatic
        processes...
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; Will 
log files
        assist you in helping
        
        &gt;&gt; me?&amp;amp;nbsp; I
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;have TRACE level
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
messages turned
        on, so they are quite large.
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; Mark
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; On 
5/28/2013 5:22
        PM, rajdavies [via
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        ActiveMQ] wrote:
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;Hi
        Mark,
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp; could
        you produce a test case for your
        
        &gt;&gt; problem - it
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;would help us
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        identify the problem a lot quicker
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        thanks,
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp; Rob
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp; On 30
        Apr 2013, at 16:40, fenbers
        
        &gt;&gt; &amp;amp;lt; [hidden
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;email] &amp;amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp; wrote:
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt; Zagan wrote
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt;&amp;amp;gt; Can you please
        
        &gt;&gt; check if your .log
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;files in the /data
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; directory are cleaned
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt;&amp;amp;gt; up? On basis of
        
        &gt;&gt; the information I
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;suppose this
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; behaviour is due to a
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt;&amp;amp;gt; misconfiguration
        
        &gt;&gt; of your clients.
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt;&amp;amp;gt; If this is the
        
        &gt;&gt; case often broken
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;log file cleanup is a
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; symptom.
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt; I get the same error as
        
        &gt;&gt; brought up in this
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;thread (KahaDB
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; failed to store to
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt; Journal). &amp;amp;nbsp;And
        
        &gt;&gt; yes, I also have a
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;problem with the
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; numbered
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; .log files not
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt; all getting cleaned up
        
        &gt;&gt; (most files are
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;removed
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; appropriately). &amp;amp;nbsp;I have
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt; suspected a client
        
        &gt;&gt; configuration problem
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;for a long time,
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; but can't figure
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt; out what's wrong -- even
        
        &gt;&gt; with TRACE
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;logging turned on.
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;amp;nbsp;In
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; the meantime, I
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt; have to cope with
        
        &gt;&gt; ActiveMQ crashing (i.e.,
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;shutting itself
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; down) about every
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt; two days. &amp;amp;nbsp;The
        
        &gt;&gt; logs point to a
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;disk storage problem, but
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; I
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; have plenty of
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt; space, so that's not the
        
        &gt;&gt; issue!
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;amp;nbsp;I've tried a couple of
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; different Linux
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt; boxes and both local and
        
        &gt;&gt; NFS mounts, and
        
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;this issue occurs
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; on both of them.
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt;
        
        &gt;&gt; 
        &gt;&gt; &nbsp; &nbsp; &nbsp; &nbsp;&amp;gt; &amp;nbsp; &amp;nbsp; 
&amp;nbsp;
        &amp;nbsp; &amp;amp;gt;
        
        &gt;&gt; 
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