We have Active MQ and Zookeeper ensemble on 3 nodes. We observed that
ActiveMQ goes down for some reason ,which didn't reflected in the log,since
log is in debug mode & at it automatically attempts to start itself after
some time but fails to do due to below error.Can any one suggest why its
happening so .
Replicated LevelDB is not supported, primarily because there weren't people
who knew the code who were willing to maintain the code (and provide
support on this mailing list), and it's been years since I've seen anyone
answer a meaningful question about replicated LevelDB here. Although it's
possible that someone will answer your question, if you want to use LevelDB
you should be prepared to debug the code yourself. If you're not, you
should consider switching to KahaDB.
> We have Active MQ and Zookeeper ensemble on 3 nodes. We observed that
> ActiveMQ goes down for some reason ,which didn't reflected in the log,since
> log is in debug mode & at it automatically attempts to start itself after
> some time but fails to do due to below error.Can any one suggest why its
> happening so .
> 1767 2018-11-27 14:53:46,423 | DEBUG |
> [/activemq/leveldb-stores/00000000040] [ZooKeeperTreeTracker@3cda58e0]
> [Thread[main,5,main]] start tracking leaf node zkTxId=5 1539607591 |
> org.linkedin.zookeeper.tracker.ZooKeeperTreeTracker | main
> 2018-11-27 14:53:46,424 | DEBUG | [/activemq/leveldb-stores]
> [ZooKeeperTreeTracker@3cda58e0] [Thread[main,5,main]] start tracking node
> zkTxId=51539607590 | org.
> linkedin.zookeeper.tracker.ZooKeeperTreeTracker | main
> 1769 2018-11-27 14:53:46,424 | ERROR | Failed to start Apache ActiveMQ
> (localhost, null) | org.apache.activemq.broker.BrokerService | main
> 1770 java.lang.NullPointerException
> 1771 at
> 1772 at
> Sent from:
> http://activemq.2283324.n4.nabble.com/ActiveMQ-User-f2341805.html >