Dataxtax Agent error - cassandra

Question

While adding existing cluster in OpsCenter I receive an error:
ERROR: Agent for XXX.XXX.XXX.XXX was unable to complete operation (http://XXX.XXX.XXX.XXX:61621/snapshots/pit/properties?): java.lang.IllegalArgumentException: No implementation of method: :make-reader of protocol: #'clojure.java.io/IOFactory found for class: nil
On agent there is an error:
java.lang.IllegalArgumentException: No implementation of method: :make-reader of protocol: #'clojure.java.io/IOFactory found for class: nil
at clojure.core$_cache_protocol_fn.invoke(core_deftype.clj:541)
at clojure.java.io$fn__8551$G__8546__8558.invoke(io.clj:73)
at clojure.java.io$reader.doInvoke(io.clj:106)
at clojure.lang.RestFn.invoke(RestFn.java:410)
at clojure.lang.AFn.applyToHelper(AFn.java:161)
at clojure.lang.RestFn.applyTo(RestFn.java:132)
at clojure.core$apply.invoke(core.clj:619)
at clojure.core$slurp.doInvoke(core.clj:6278)
at clojure.lang.RestFn.invoke(RestFn.java:410)
at opsagent.backups.pit$read_properties.invoke(pit.clj:68)
at opsagent.backups.pit$enabled_QMARK_.invoke(pit.clj:106)
at clojure.core$eval37.invoke(NO_SOURCE_FILE:107)
at clojure.lang.Compiler.eval(Compiler.java:6619)
at clojure.lang.Compiler.eval(Compiler.java:6609)
at clojure.lang.Compiler.eval(Compiler.java:6582)
at clojure.core$eval.invoke(core.clj:2852)
at opsagent.opsagent$post_interface_startup.doInvoke(opsagent.clj:102)
at clojure.lang.RestFn.invoke(RestFn.java:421)
at opsagent.conf$handle_new_conf.invoke(conf.clj:198)
at opsagent.messaging$message_callback$fn__12316.invoke(messaging.clj:52)
at opsagent.messaging.proxy$java.lang.Object$StompConnection$Listener$7f16bc72.onMessage(Unknown Source)
at org.jgroups.client.StompConnection.notifyListeners(StompConnection.java:324)
at org.jgroups.client.StompConnection.run(StompConnection.java:274)
at java.lang.Thread.run(Thread.java:745)
And cluster creation failed. Also i get this error during startup. I tried reinstall agent but in won't help
DataStax Agent version: 5.1.0
OpsCenter version 5.1.0
root#node1:~# java -version
java version "1.7.0_75"
OpenJDK Runtime Environment (IcedTea 2.5.4) (7u75-2.5.4-1~deb7u1)
OpenJDK 64-Bit Server VM (build 24.75-b04, mixed mode)
root#node1:~#
Content of address.yaml
stomp_interface: "YYY.YYY.YYY.YYY"
Content of opscenterd.conf
[webserver]
port = 8888
interface = 0.0.0.0
use_ssl = false
[logging]
level = INFO
<cluster name>.conf is absent, because cluster not added

Answer 1

The problem the agent is having is finding your installation of DSE on that node. When it can't find DSE it can't get the archiving properties file to update and errors out.
This error message is unfortunately terribly unhelpful. I've created a ticket to fix the error message (it's unfortunately private, but you can use this ticket number when discussing the issue with DataStax: OPSC-4826)
For a work around, try setting cassandra_install_location in your address.yaml file on that node. After adjusting address.yaml please bounce the agent and you can retry that operation.
You can find a document listing this and more address.yaml config items here: http://www.datastax.com/documentation/opscenter/5.1/opsc/configure/agentAddressConfiguration.html

Answer 2

I think the issue will be with your Java installation. I believe you'll need Oracle Java, not OpenJDK.
This worked for me:
ubuntu:~$ sudo add-apt-repository ppa:webupd8team/java
ubuntu:~$ sudo apt-get update && sudo apt-get install oracle-java7-installer oracle-java7-set-default