Falcon Server HTTP Error 503 even after installing Berkeley DB

[#1]

HDP Version: 2.6.4.0

Falcon Version: 0.10.0

Ambari Version: 2.6.2.2

We are having problems with Falcon Server. Alert in the Ambari Dashboard is:

HTTP 503 response from http://aforge021:15000 in 0.000s (HTTP Error 503: Service Unavailable)

Error in /var/log/falcon on Falcon server:

2018-08-13
16:57:22,672 ERROR - [main:] ~ Failed startup of context
org.mortbay.jetty.webapp.WebAppContext@34e260e{/,/usr/hdp/current/falcon-server/server/webapp/falcon}
(log:87)java.lang.RuntimeException:
org.apache.falcon.FalconException: Unable to get instance for
org.apache.atlas.falcon.service.AtlasService  at
org.apache.falcon.listener.ContextStartupListener.contextInitialized(ContextStartupListener.java:59)  at
org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:549)  at
org.mortbay.jetty.servlet.Context.startContext(Context.java:136)  at
org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)  at
org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)  at
org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)  at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)  at
org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)  at
org.mortbay.jetty.Server.doStart(Server.java:224)  at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)  at
org.apache.falcon.util.EmbeddedServer.start(EmbeddedServer.java:58)  at
org.apache.falcon.FalconServer.main(FalconServer.java:118)Caused
by: org.apache.falcon.FalconException: Unable to get instance for
org.apache.atlas.falcon.service.AtlasService  at
org.apache.falcon.util.ReflectionUtils.getInstanceByClassName(ReflectionUtils.java:52)  at
org.apache.falcon.service.ServiceInitializer.initialize(ServiceInitializer.java:43)  at
org.apache.falcon.listener.ContextStartupListener.contextInitialized(ContextStartupListener.java:56)  ... 11 moreCaused
by: java.lang.ClassNotFoundException:
org.apache.atlas.falcon.service.AtlasService  at
java.net.URLClassLoader.findClass(URLClassLoader.java:381)  at
java.lang.ClassLoader.loadClass(ClassLoader.java:424)  at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)  at
java.lang.ClassLoader.loadClass(ClassLoader.java:357)  at
org.apache.falcon.util.ReflectionUtils.getInstanceByClassName(ReflectionUtils.java:44)  ... 13 more

Originally when the cluster and falcon were installed it did not have the Berkeley DB installed. After searching my error messages I found that this was needed and installed it using the steps outlined in this post:

https://community.hortonworks.com/questions/11862/falcon-ui-not-working.html

But after installing the Berkeley DB I still have the same error. I have also tried deleting the Falcon service in Ambari, redoing the steps to install Berkeley DB, and then re-installing Falcon, but the same error remains.

[#2 · Accepted solution]

Please check if atlas client is installed in the falcon machine. If the client is installed and still seeing the issue.

Check if atlas is mapped to the correct hdp version using below command.

>>>hdp-select | grep atlas 
atlas-client - 2.6.4.0-91 
atlas-server - 2.6.4.0-91 

[#3]

Atlas client was not installed on the Falcon Server. After installing the atlas client I can now access the Falcon Web UI. Thank you!