FAQ
Hi,
We are using ActiveMQ 5.10.0 with the replicated LevelDB store, with leader
election handled by ZooKeeper.

We have encountered an issue where the ZooKeeper session expired on all of
our 3 AMQ instances.

However, no leader election took place to elect a master after a new
session was established, so even though all AMQ nodes were up and running,
none of them were listening for messages on port 61616.

Has anyone else encountered this issue? Is this a bug? I have not attempted
to replicate this yet.
I pasted the relevant logs below. Notably, after 2014-10-18 09:04:47,585,
no leader election took place; we restarted the activemq process
at 2014-10-18 15:13:14,541

Thanks,
-Roman

2014-10-18 09:04:31,904 | WARN | [/activemq/leveldb-stores/00000000084]
[ZooKeeperTreeTracker@51987ed7] [Thread[main-EventThread,5,main]] Error in
treeWatcher (ignored) | org.linkedin.zookeeper.tracker.ZooKeeperTreeTracker
main-EventThread
org.apache.zookeeper.KeeperException$SessionExpiredException:
KeeperErrorCode = Session expired for /activemq/leveldb-stores/00000000084
         at
org.apache.zookeeper.KeeperException.create(KeeperException.java:127)[zookeeper-3.4.5.jar:3.4.5-1392090]
         at
org.apache.zookeeper.KeeperException.create(KeeperException.java:51)[zookeeper-3.4.5.jar:3.4.5-1392090]
         at
org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1151)[zookeeper-3.4.5.jar:3.4.5-1392090]
         at
org.linkedin.zookeeper.client.ZooKeeperImpl.getData(ZooKeeperImpl.java:191)[org.linkedin.zookeeper-impl-1.4.0.jar:]
         at
org.linkedin.zookeeper.client.AbstractZooKeeper.getData(AbstractZooKeeper.java:213)[org.linkedin.zookeeper-impl-1.4.0.jar:]
         at
org.linkedin.zookeeper.client.AbstractZKClient.getZKByteData(AbstractZKClient.java:213)[org.linkedin.zookeeper-impl-1.4.0.jar:]
         at
org.linkedin.zookeeper.tracker.ZKByteArrayDataReader.readData(ZKByteArrayDataReader.java:37)[org.linkedin.zookeeper-impl-1.4.0.jar:]
         at
org.linkedin.zookeeper.tracker.ZooKeeperTreeTracker.trackNode(ZooKeeperTreeTracker.java:280)[org.linkedin.zookeeper-impl-1.4.0.jar:]
         at
org.linkedin.zookeeper.tracker.ZooKeeperTreeTracker.handleNodeDeleted(ZooKeeperTreeTracker.java:359)[org.linkedin.zookeeper-impl-1.4.0.jar:]
         at
org.linkedin.zookeeper.tracker.ZooKeeperTreeTracker.access$500(ZooKeeperTreeTracker.java:50)[org.linkedin.zookeeper-impl-1.4.0.jar:]
         at
org.linkedin.zookeeper.tracker.ZooKeeperTreeTracker$TreeWatcher.process(ZooKeeperTreeTracker.java:94)[org.linkedin.zookeeper-impl-1.4.0.jar:]
         at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:519)[zookeeper-3.4.5.jar:3.4.5-1392090]
         at
org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:495)[zookeeper-3.4.5.jar:3.4.5-1392090]
2014-10-18 09:04:31,905 | WARN | unprocessed event state: AuthFailed |
org.apache.activemq.leveldb.replicated.groups.ZKClient | main-EventThread
2014-10-18 09:04:31,905 | WARN | Expiration detected: trying to restart...
org.apache.activemq.leveldb.replicated.groups.ZKClient | main-EventThread
2014-10-18 09:04:31,906 | INFO | Initiating client connection,
connectString=cargo308:2181,cargo309:2181,cargo310:2181 sessionTimeout=2000
watcher=org.apache.activemq.leveldb.replicated.groups.ZKClient@512edb17 |
org.apache.zookeeper.ZooKeeper | main-EventThread
2014-10-18 09:04:31,909 | INFO | EventThread shut down |
org.apache.zookeeper.ClientCnxn | main-EventThread
2014-10-18 09:04:31,911 | WARN | SASL configuration failed:
javax.security.auth.login.LoginException: No JAAS configuration section
named 'Client' was found in specified JAAS configuration file:
'/home/apps/activemq/conf/login.config'. Will continue connection to
Zookeeper server without SASL authentication, if Zookeeper server allows
it. | org.apache.zookeeper.ClientCnxn | main-SendThread(cargo309:2181)
2014-10-18 09:04:31,911 | INFO | Opening socket connection to server
cargo309/10.3.30.59:2181 | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo309:2181)
2014-10-18 09:04:31,911 | WARN | unprocessed event state: AuthFailed |
org.apache.activemq.leveldb.replicated.groups.ZKClient | main-EventThread
2014-10-18 09:04:31,912 | INFO | Socket connection established to cargo309/
10.3.30.59:2181, initiating session | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo309:2181)
2014-10-18 09:04:31,927 | INFO | Session establishment complete on server
cargo309/10.3.30.59:2181, sessionid = 0x24893c5d5e6022f, negotiated timeout
= 4000 | org.apache.zookeeper.ClientCnxn | main-SendThread(cargo309:2181)
2014-10-18 09:04:37,283 | INFO | Client session timed out, have not heard
from server in 2668ms for sessionid 0x24893c5d5e6022f, closing socket
connection and attempting reconnect | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo309:2181)
2014-10-18 09:04:38,124 | WARN | SASL configuration failed:
javax.security.auth.login.LoginException: No JAAS configuration section
named 'Client' was found in specified JAAS configuration file:
'/home/apps/activemq/conf/login.config'. Will continue connection to
Zookeeper server without SASL authentication, if Zookeeper server allows
it. | org.apache.zookeeper.ClientCnxn | main-SendThread(cargo310:2181)
2014-10-18 09:04:38,124 | INFO | Opening socket connection to server
cargo310/10.3.30.60:2181 | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo310:2181)
2014-10-18 09:04:38,124 | WARN | unprocessed event state: AuthFailed |
org.apache.activemq.leveldb.replicated.groups.ZKClient | main-EventThread
2014-10-18 09:04:38,127 | INFO | Socket connection established to cargo310/
10.3.30.60:2181, initiating session | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo310:2181)
2014-10-18 09:04:39,462 | INFO | Client session timed out, have not heard
from server in 1335ms for sessionid 0x24893c5d5e6022f, closing socket
connection and attempting reconnect | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo310:2181)
2014-10-18 09:04:39,775 | WARN | SASL configuration failed:
javax.security.auth.login.LoginException: No JAAS configuration section
named 'Client' was found in specified JAAS configuration file:
'/home/apps/activemq/conf/login.config'. Will continue connection to
Zookeeper server without SASL authentication, if Zookeeper server allows
it. | org.apache.zookeeper.ClientCnxn | main-SendThread(cargo308:2181)
2014-10-18 09:04:39,775 | INFO | Opening socket connection to server
cargo308/10.3.30.58:2181 | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo308:2181)
2014-10-18 09:04:39,775 | WARN | unprocessed event state: AuthFailed |
org.apache.activemq.leveldb.replicated.groups.ZKClient | main-EventThread
2014-10-18 09:04:39,776 | INFO | Socket connection established to cargo308/
10.3.30.58:2181, initiating session | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo308:2181)
2014-10-18 09:04:41,111 | INFO | Client session timed out, have not heard
from server in 1335ms for sessionid 0x24893c5d5e6022f, closing socket
connection and attempting reconnect | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo308:2181)
2014-10-18 09:04:43,070 | WARN | SASL configuration failed:
javax.security.auth.login.LoginException: No JAAS configuration section
named 'Client' was found in specified JAAS configuration file:
'/home/apps/activemq/conf/login.config'. Will continue connection to
Zookeeper server without SASL authentication, if Zookeeper server allows
it. | org.apache.zookeeper.ClientCnxn | main-SendThread(cargo309:2181)
2014-10-18 09:04:43,070 | INFO | Opening socket connection to server
cargo309/10.3.30.59:2181 | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo309:2181)
2014-10-18 09:04:43,070 | WARN | unprocessed event state: AuthFailed |
org.apache.activemq.leveldb.replicated.groups.ZKClient | main-EventThread
2014-10-18 09:04:44,405 | INFO | Client session timed out, have not heard
from server in 3193ms for sessionid 0x24893c5d5e6022f, closing socket
connection and attempting reconnect | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo309:2181)
2014-10-18 09:04:44,698 | WARN | SASL configuration failed:
javax.security.auth.login.LoginException: No JAAS configuration section
named 'Client' was found in specified JAAS configuration file:
'/home/apps/activemq/conf/login.config'. Will continue connection to
Zookeeper server without SASL authentication, if Zookeeper server allows
it. | org.apache.zookeeper.ClientCnxn | main-SendThread(cargo310:2181)
2014-10-18 09:04:44,699 | INFO | Opening socket connection to server
cargo310/10.3.30.60:2181 | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo310:2181)
2014-10-18 09:04:44,699 | WARN | unprocessed event state: AuthFailed |
org.apache.activemq.leveldb.replicated.groups.ZKClient | main-EventThread
2014-10-18 09:04:44,699 | INFO | Socket connection established to cargo310/
10.3.30.60:2181, initiating session | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo310:2181)
2014-10-18 09:04:44,701 | INFO | Unable to read additional data from
server sessionid 0x24893c5d5e6022f, likely server has closed socket,
closing socket connection and attempting reconnect |
org.apache.zookeeper.ClientCnxn | main-SendThread(cargo310:2181)
2014-10-18 09:04:44,979 | WARN | SASL configuration failed:
javax.security.auth.login.LoginException: No JAAS configuration section
named 'Client' was found in specified JAAS configuration file:
'/home/apps/activemq/conf/login.config'. Will continue connection to
Zookeeper server without SASL authentication, if Zookeeper server allows
it. | org.apache.zookeeper.ClientCnxn | main-SendThread(cargo308:2181)
2014-10-18 09:04:44,979 | INFO | Opening socket connection to server
cargo308/10.3.30.58:2181 | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo308:2181)
2014-10-18 09:04:44,979 | WARN | unprocessed event state: AuthFailed |
org.apache.activemq.leveldb.replicated.groups.ZKClient | main-EventThread
2014-10-18 09:04:44,980 | INFO | Socket connection established to cargo308/
10.3.30.58:2181, initiating session | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo308:2181)
2014-10-18 09:04:44,981 | INFO | Unable to read additional data from
server sessionid 0x24893c5d5e6022f, likely server has closed socket,
closing socket connection and attempting reconnect |
org.apache.zookeeper.ClientCnxn | main-SendThread(cargo308:2181)
2014-10-18 09:04:47,076 | WARN | SASL configuration failed:
javax.security.auth.login.LoginException: No JAAS configuration section
named 'Client' was found in specified JAAS configuration file:
'/home/apps/activemq/conf/login.config'. Will continue connection to
Zookeeper server without SASL authentication, if Zookeeper server allows
it. | org.apache.zookeeper.ClientCnxn | main-SendThread(cargo309:2181)
2014-10-18 09:04:47,076 | INFO | Opening socket connection to server
cargo309/10.3.30.59:2181 | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo309:2181)
2014-10-18 09:04:47,076 | WARN | unprocessed event state: AuthFailed |
org.apache.activemq.leveldb.replicated.groups.ZKClient | main-EventThread
2014-10-18 09:04:47,077 | INFO | Socket connection established to cargo309/
10.3.30.59:2181, initiating session | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo309:2181)
2014-10-18 09:04:47,079 | INFO | Unable to read additional data from
server sessionid 0x24893c5d5e6022f, likely server has closed socket,
closing socket connection and attempting reconnect |
org.apache.zookeeper.ClientCnxn | main-SendThread(cargo309:2181)
2014-10-18 09:04:47,582 | WARN | SASL configuration failed:
javax.security.auth.login.LoginException: No JAAS configuration section
named 'Client' was found in specified JAAS configuration file:
'/home/apps/activemq/conf/login.config'. Will continue connection to
Zookeeper server without SASL authentication, if Zookeeper server allows
it. | org.apache.zookeeper.ClientCnxn | main-SendThread(cargo310:2181)
2014-10-18 09:04:47,582 | INFO | Opening socket connection to server
cargo310/10.3.30.60:2181 | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo310:2181)
2014-10-18 09:04:47,582 | WARN | unprocessed event state: AuthFailed |
org.apache.activemq.leveldb.replicated.groups.ZKClient | main-EventThread
2014-10-18 09:04:47,583 | INFO | Socket connection established to cargo310/
10.3.30.60:2181, initiating session | org.apache.zookeeper.ClientCnxn |
main-SendThread(cargo310:2181)
2014-10-18 09:04:47,585 | INFO | Session establishment complete on server
cargo310/10.3.30.60:2181, sessionid = 0x24893c5d5e6022f, negotiated timeout
= 4000 | org.apache.zookeeper.ClientCnxn | main-SendThread(cargo310:2181)
2014-10-18 15:13:14,541 | INFO | Refreshing
org.apache.activemq.xbean.XBeanBrokerFactory$1@476d7e38: startup date [Sat
Oct 18 15:13:14 EDT 2014]; root of context hierarchy |
org.apache.activemq.xbean.XBeanBrokerFactory$1 | main

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  • Uromahn at Oct 23, 2014 at 9:51 am
    I have experimented with ActiveMQ's replicated LevelDB store for quite some
    time now and finally came to the conclusion that it is very "flaky" and
    "brittle" at best.

    I believe it is not ready for production yet and everybody who considers
    using it in a hot production environment should probably think twice (or
    trice).

    For example, I have a running active/passive cluster with three instances
    (one active, two passive) connecting to three Zookeeper nodes. I ran several
    tests against this cluster and then left it sitting over night. The next
    morning I came back I saw the following exceptions in the log files
    *without* any activity!

    On the active node:
    2014-10-22 22:31:05,027 | WARN | Unexpected session error:
    java.io.IOException: Connection reset by peer |
    org.apache.activemq.leveldb.replicated.MasterLevelDBStore |
    hawtdispatch-DEFAULT-2
    2014-10-22 22:31:05,028 | INFO | Slave has disconnected:
    d8175d91-6602-4abf-bdfc-2ab07c40997e |
    org.apache.activemq.leveldb.replicated.MasterLevelDBStore |
    hawtdispatch-DEFAULT-2

    On node #2 (passive):
    2014-10-22 22:31:04,796 | INFO | Client session timed out, have not heard
    from server in 29584ms for sessionid 0x24937f0a2a70001, closing socket
    connection and attempting reconnect | org.apache.zookeeper.ClientCnxn |
    main-SendThread(uromahn-zk2:2181)
    2014-10-22 22:31:05,098 | INFO | Slave stopped |
    org.apache.activemq.leveldb.replicated.MasterElector | ActiveMQ
    BrokerService[brokergrp1] Task-3
    2014-10-22 22:31:05,494 | INFO | Opening socket connection to server
    uromahn-zk3/10.XX.YY.ZZ:2181. Will not attempt to authenticate using SASL
    (unknown error) | org.apache.zookeeper.ClientCnxn |
    main-SendThread(uromahn-zk3:2181)
    2014-10-22 22:31:05,524 | INFO | Socket connection established to
    uromahn-zk3/10.XX.YY.ZZ:2181, initiating session |
    org.apache.zookeeper.ClientCnxn | main-SendThread(uromahn-zk3:2181)
    2014-10-22 22:31:05,564 | WARN | Expiration detected: trying to restart...
    org.apache.activemq.leveldb.replicated.groups.ZKClient | main-EventThread
    2014-10-22 22:31:05,564 | INFO | Initiating client connection,
    connectString=uromahn-zk1:2181,uromahn-zk2:2181,uromahn-zk3:2181
    sessionTimeout=2000
    watcher=org.apache.activemq.leveldb.replicated.groups.ZKClient@3c53cec2 |
    org.apache.zookeeper.ZooKeeper | main-EventThread
    2014-10-22 22:31:05,566 | INFO | Unable to reconnect to ZooKeeper service,
    session 0x24937f0a2a70001 has expired, closing socket connection |
    org.apache.zookeeper.ClientCnxn | main-SendThread(uromahn-zk3:2181)
    2014-10-22 22:31:05,572 | INFO | Opening socket connection to server
    uromahn-zk1/10.XX.AA.BB:2181. Will not attempt to authenticate using SASL
    (unknown error) | org.apache.zookeeper.ClientCnxn |
    main-SendThread(uromahn-zk1:2181)
    2014-10-22 22:31:05,579 | INFO | EventThread shut down |
    org.apache.zookeeper.ClientCnxn | main-EventThread
    2014-10-22 22:31:05,597 | INFO | Socket connection established to
    uromahn-zk1/10.XX.AA.BB:2181, initiating session |
    org.apache.zookeeper.ClientCnxn | main-SendThread(uromahn-zk1:2181)
    2014-10-22 22:31:05,625 | INFO | Session establishment complete on server
    uromahn-zk1/10.XX.AA.BB:2181, sessionid = 0x14937f0a2840000, negotiated
    timeout = 4000 | org.apache.zookeeper.ClientCnxn |
    main-SendThread(uromahn-zk1:2181)
    2014-10-22 22:31:05,745 | WARN | listeners are taking too long to process
    the events |
    org.apache.activemq.leveldb.replicated.groups.ChangeListenerSupport |
    ZooKeeper state change dispatcher thread

    On node #3 (passive):
    no entry int he log file for that time.

    And these are the log entries in my corresponding Zookeeper nodes:
    Node #1:
    2014-10-22 22:31:05,604 [myid:1] - INFO
    [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxnFactory@197] -
    Accepted socket connection from /10.XX.YY.ZZ:38788
    2014-10-22 22:31:05,606 [myid:1] - INFO
    [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:ZooKeeperServer@868] - Client
    attempting to establish new session at /10.XX.YY.ZZ:38788
    2014-10-22 22:31:05,612 [myid:1] - INFO
    [CommitProcessor:1:ZooKeeperServer@617] - Established session
    0x14937f0a2840000 with negotiated timeout 4000 for client /10.XX.YY.ZZ:38788

    Node #2:
    2014-10-22 22:30:40,000 [myid:2] - INFO
    [SessionTracker:ZooKeeperServer@347] - Expiring session 0x24937f0a2a70001,
    timeout of 4000ms exceeded
    2014-10-22 22:30:40,002 [myid:2] - INFO [ProcessThread(sid:2
    cport:-1)::PrepRequestProcessor@494] - Processed session termination for
    sessionid: 0x24937f0a2a70001
    2014-10-22 22:30:40,009 [myid:2] - INFO
    [CommitProcessor:2:NIOServerCnxn@1007] - Closed socket connection for client
    /10.XX.YY.ZZ:52422 which had sessionid 0x24937f0a2a70001
    2014-10-22 22:31:05,639 [myid:2] - INFO [ProcessThread(sid:2
    cport:-1)::PrepRequestProcessor@645] - Got user-level KeeperException when
    processing sessionid:0x14937f0a2840000 type:setData cxid:0x1
    zxid:0x100000014 txntype:-1 reqpath:n/a Error
    Path:/activemq-grp1/leveldb-stores/00000000001 Error:KeeperErrorCode =
    NoNode for /activemq-grp1/leveldb-stores/00000000001

    Node #3:
    2014-10-22 22:30:39,972 [myid:3] - WARN
    [QuorumPeer[myid=3]/0:0:0:0:0:0:0:0:2181:Follower@118] - Got zxid
    0x100000012 expected 0x1
    2014-10-22 22:31:05,494 [myid:3] - INFO
    [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxnFactory@197] -
    Accepted socket connection from /10.XX.YY.ZZ:60802
    2014-10-22 22:31:05,497 [myid:3] - INFO
    [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:ZooKeeperServer@861] - Client
    attempting to renew session 0x24937f0a2a70001 at /10.XX.YY.ZZ:60802
    2014-10-22 22:31:05,497 [myid:3] - INFO
    [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:Learner@108] - Revalidating
    client: 0x24937f0a2a70001
    2014-10-22 22:31:05,516 [myid:3] - INFO
    [QuorumPeer[myid=3]/0:0:0:0:0:0:0:0:2181:ZooKeeperServer@610] - Invalid
    session 0x24937f0a2a70001 for client /10.XX.YY.ZZ:60802, probably expired
    2014-10-22 22:31:05,519 [myid:3] - INFO
    [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1007] - Closed
    socket connection for client /10.XX.YY.ZZ:60802 which had sessionid
    0x24937f0a2a70001

    One should note and emphasize again: during the time I see those messages in
    the log there was absolutely no activity on the broker and the Zookeeper
    nodes (those are exclusively for my brokers)!

    This simply doesn't give me the confidence of a robust solution - sorry
    guys!



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  • James Black at Nov 20, 2014 at 11:50 am
    Hi,

    I had the same issue with 2 ActiveMq 5.10 nodes and 3 ZooKeeper nodes.

    At first everything worked well but after long running stress tests we had
    the same situation were the master would step down and no node would become
    the new master. This would break our application and we were glad not to be
    using this in production.

    After this we moved to using RabbitMq and have had no problems with that
    solution.

    Thanks,

    Justin



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  • Khandelwalanuj at Dec 3, 2014 at 11:08 am
    Hi Torsh,

    I also saw this issue once. What values did you specify for tickTime and
    zkSessionTmeout ?

    Thanks,
    Anuj



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    View this message in context: http://activemq.2283324.n4.nabble.com/ActiveMQ-Master-Slave-with-ZooKeeper-Session-Expiration-tp4686562p4688318.html
    Sent from the ActiveMQ - User mailing list archive at Nabble.com.
  • Khandelwalanuj at Dec 3, 2014 at 2:03 pm
    Just to be clear:
    Zookeeper side : Session Timeout is 2 * tick_time.
    "zkSessionTmeout" : ActiveMQ configuration for session timeout

    So if I specify both tick_time and zkSessionTimeout different which will be
    respected. Is it minimum of both the values ?

    Thanks,
    Anuj





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