Our cluster was upgraded to MapR 4.0.1 (from 3.0.1) over the weekend and our
app is throwing unexpected exceptions related to ZooKeeper. To eliminate our
own code as the culprit, I am using the Curator PathChildrenCache example to
debug, since our own code is using the PathChildrenCache.
There are just a few customizations from the vanilla example code, namely:
private static String PATH = "/optum/myapp/jobstatus";
private static String connectionString = "<myconnectionstring>"
And, System.err.println(e); was added to the catch() statement in the setValue
method.
When running the example we see:
$ java -jar zk-test-0.0.1-SNAPSHOT.jar cache.Example
An example of using PathChildrenCache. This example is driven by entering
commands at the prompt:
set <name> <value>: Adds or updates a node with the given name
remove <name>: Deletes the node with the given name
list: List the nodes/values in the cache
quit: Quit the example
> list
* empty *
> set asdf asdf
org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode
for /cache.Example/asdf
> list
* empty *
Any ideas? Is this a general ZK issue? Other applications on the cluster
appear to be running happily.
A more complete stack trace of the error is:
[2015-05-18 13:30:53,587]
[[analytic-platform-service-2.1.0-SNAPSHOT.1505141956].ProcessRequest.async1.04]
ERROR KeeperException [com.uhg.optum.acc.sdk.util.CacheManager]
org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode
for /optum/acc/jobstatus/1483e1fe-14e3-4203-b139-41dc4a3b4ad3
at org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
at org.apache.zookeeper.ZooKeeper.setData(ZooKeeper.java:1266)
at
org.apache.curator.framework.imps.SetDataBuilderImpl$4.call(SetDataBuilderImpl.java:260)
at
org.apache.curator.framework.imps.SetDataBuilderImpl$4.call(SetDataBuilderImpl.java:256)
at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:107)
at
org.apache.curator.framework.imps.SetDataBuilderImpl.pathInForeground(SetDataBuilderImpl.java:252)
at
org.apache.curator.framework.imps.SetDataBuilderImpl.forPath(SetDataBuilderImpl.java:239)
at
org.apache.curator.framework.imps.SetDataBuilderImpl.forPath(SetDataBuilderImpl.java:39)
at com.uhg.optum.acc.sdk.util.CacheManager.set(CacheManager.java:140)
Thanks,
John Lavoie
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