I’ve investigated this further and the exception is thrown from the
ZooKeeper.create method. Camel is actually trying to create a znode with a path
/regexTest1/192.168.202.25-25829641-de1f-4389-9bb6-2967ea60de1a without
creating the parent node /regexTest1 first.
According to the Zookeeper.create method documentation
"If the parent node does not exist in the ZooKeeper, a KeeperException
* with error code KeeperException.NoNode will be thrown."
And I don’t see anywhere in Camel’s code where it is creating the parent nodes
first before attempting to create the final node for master election.
So I removed the path off the uri for the route policy like this
ZooKeeperRoutePolicy policy = new ZooKeeperRoutePolicy("zookeeper:localhost",
1);
And it has gotten past that error but now has encountered a different error
where it has trouble creating a threadpool.
2016-04-08 11:47:15,071 [main] ERROR
org.apache.camel.component.zookeeper.policy.ZooKeeperElection - Error
configuring ZookeeperElection
java.lang.IllegalArgumentException: id for thread pool
org.apache.camel.util.concurrent.RejectableThreadPoolExecutor@1ec912d7[Running,
pool size = 0, active threads = 0, queued tasks = 0, completed tasks =
0][Camel-Zookeeper Ops executor] must be specified and not empty
at org.apache.camel.util.ObjectHelper.notEmpty(ObjectHelper.java:351)
~[camel-core-2.16.0.jar:2.16.0]
at
org.apache.camel.impl.DefaultExecutorServiceManager.onThreadPoolCreated(DefaultExecutorServiceManager.java:522)
~[camel-core-2.16.0.jar:2.16.0]
at
org.apache.camel.impl.DefaultExecutorServiceManager.newThreadPool(DefaultExecutorServiceManager.java:191)
~[camel-core-2.16.0.jar:2.16.0]
at
org.apache.camel.impl.DefaultExecutorServiceManager.newFixedThreadPool(DefaultExecutorServiceManager.java:230)
~[camel-core-2.16.0.jar:2.16.0]
at
org.apache.camel.component.zookeeper.ZooKeeperConsumer.doStart(ZooKeeperConsumer.java:72)
~[camel-zookeeper-2.16.0.jar:2.16.0]
at
org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61)
~[camel-core-2.16.0.jar:2.16.0]
at
org.apache.camel.impl.DefaultCamelContext.startService(DefaultCamelContext.java:3219)
~[camel-core-2.16.0.jar:2.16.0]
> On 7 Apr 2016, at 11:44 AM, Minh Tran <darth.minhs...@gmail.com> wrote:
>
> Hi
>
> I am trying to setup a ZooKeeper route policy like this
>
> ZooKeeperRoutePolicy policy = new
> ZooKeeperRoutePolicy("zookeeper:localhost/regexTest1?create=true", 1);
> from("direct:start").routePolicy(policy).to(“mock:end”);
>
> And when I run my unit test to trigger the route, I get the following
> exception in my logs
>
> Node '/regexTest1/192.168.202.25-3306c9d2-1354-4dbe-aaff-846eee5bb60d' did
> not exist, creating it.
> Error setting up election node
> /regexTest1/192.168.202.25-25829641-de1f-4389-9bb6-2967ea60de1a
> org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode =
> NoNode for /regexTest1/192.168.202.25-25829641-de1f-4389-9bb6-2967ea60de1a
> at
> org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
> ~[zookeeper-3.4.8.jar:3.4.8--1]
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> ~[zookeeper-3.4.8.jar:3.4.8--1]
> at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:783)
> ~[zookeeper-3.4.8.jar:3.4.8--1]
> at
> org.apache.camel.component.zookeeper.operations.CreateOperation.getResult(CreateOperation.java:52)
> ~[camel-zookeeper-2.17.0.jar:2.17.0]
> at
> org.apache.camel.component.zookeeper.operations.ZooKeeperOperation.get(ZooKeeperOperation.java:70)
> ~[camel-zookeeper-2.17.0.jar:2.17.0]
> at
> org.apache.camel.component.zookeeper.ZookeeperProducer.createNode(ZookeeperProducer.java:222)
> ~[camel-zookeeper-2.17.0.jar:2.17.0]
> at
> org.apache.camel.component.zookeeper.ZookeeperProducer.synchronouslySetData(ZookeeperProducer.java:238)
> ~[camel-zookeeper-2.17.0.jar:2.17.0]
> at
> org.apache.camel.component.zookeeper.ZookeeperProducer.process(ZookeeperProducer.java:88)
> ~[camel-zookeeper-2.17.0.jar:2.17.0]
> at
> org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61)
> ~[camel-core-2.17.0.jar:2.17.0]
> at
> org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
> [camel-core-2.17.0.jar:2.17.0]
> at
> org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:109)
> [camel-core-2.17.0.jar:2.17.0]
> at
> org.apache.camel.processor.UnitOfWorkProducer.process(UnitOfWorkProducer.java:68)
> [camel-core-2.17.0.jar:2.17.0]
> at
> org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:412)
> [camel-core-2.17.0.jar:2.17.0]
> at
> org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:380)
> [camel-core-2.17.0.jar:2.17.0]
> at
> org.apache.camel.impl.ProducerCache.doInProducer(ProducerCache.java:270)
> [camel-core-2.17.0.jar:2.17.0]
> at
> org.apache.camel.impl.ProducerCache.sendExchange(ProducerCache.java:380)
> [camel-core-2.17.0.jar:2.17.0]
> at org.apache.camel.impl.ProducerCache.send(ProducerCache.java:205)
> [camel-core-2.17.0.jar:2.17.0]
> at
> org.apache.camel.impl.DefaultProducerTemplate.send(DefaultProducerTemplate.java:119)
> [camel-core-2.17.0.jar:2.17.0]
> at
> org.apache.camel.component.zookeeper.policy.ZooKeeperElection.createCandidateNode(ZooKeeperElection.java:146)
> [camel-zookeeper-2.17.0.jar:2.17.0]
> at
> org.apache.camel.component.zookeeper.policy.ZooKeeperElection.testAndCreateCandidateNode(ZooKeeperElection.java:116)
> [camel-zookeeper-2.17.0.jar:2.17.0]
> at
> org.apache.camel.component.zookeeper.policy.ZooKeeperElection.isMaster(ZooKeeperElection.java:92)
> [camel-zookeeper-2.17.0.jar:2.17.0]
> at
> org.apache.camel.component.zookeeper.policy.ZooKeeperRoutePolicy.onExchangeBegin(ZooKeeperRoutePolicy.java:79)
> [camel-zookeeper-2.17.0.jar:2.17.0]
> at
> org.apache.camel.processor.CamelInternalProcessor$RoutePolicyAdvice.before(CamelInternalProcessor.java:483)
> [camel-core-2.17.0.jar:2.17.0]
>
>
> It looks like it knows the znode doesn’t exist but seems to be unable to
> create it? From the zookeeper server side logs, I can see incoming
> connections and it returning the error that the znode doesn’t exist but
> doesn’t look like there’s any attempts to create it after that.
>
> I’ve tried using the zookeeper component directly in my route and I am able
> to create/write/read from a znode fine so it seems like it’s just failing in
> the route policy for some reason.
>
> I am using Camel 2.17.0 and zookeeper 3.4.8
>
> ps there’s an error in the Camel zookeeper documentation
>
> from("zookeeper://localhost:39913/somepath/somenode?awaitCreation=true").to("mock:result”);
>
> But there's no option called awaitCreation available on the component.
