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https://issues.apache.org/jira/browse/FALCON-1984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15303128#comment-15303128
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Venkat Ranganathan commented on FALCON-1984:
--------------------------------------------
The reason for this we have disabled both storage backends that we support
(berkeley db and hbase). The startup.properties has comments for this and
there is documentation on how to choose the right backend.
But [~yzheng-hortonworks], you have a good point. Let us make a clearer
message in the application log which directs users to look at their startup
properties and fix them for a particular backend.
> Need default configuration value: root.storage.backend (Fail to start Falcon
> with default startup.properties)
> -------------------------------------------------------------------------------------------------------------
>
> Key: FALCON-1984
> URL: https://issues.apache.org/jira/browse/FALCON-1984
> Project: Falcon
> Issue Type: Bug
> Reporter: Ying Zheng
>
> Can't start Falcon with default startup.properties. Need to set configuration
> value: root.storage.backend. See error details below.
> 2016-05-26 02:24:07,419 ERROR - [main:] ~ Failed to initialize service
> org.apache.falcon.metadata.MetadataMappingService (ServiceInitializer:49)
> java.lang.RuntimeException: GraphFactory could not instantiate this Graph
> implementation [com.thinkaurelius.titan.core.TitanFactory].
> at com.tinkerpop.blueprints.GraphFactory.open(GraphFactory.java:50)
> at
> org.apache.falcon.metadata.MetadataMappingService.initializeGraphDB(MetadataMappingService.java:123)
> at
> org.apache.falcon.metadata.MetadataMappingService.init(MetadataMappingService.java:90)
> at
> org.apache.falcon.service.ServiceInitializer.initialize(ServiceInitializer.java:47)
> at
> org.apache.falcon.listener.ContextStartupListener.contextInitialized(ContextStartupListener.java:56)
> at
> org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:550)
> 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:519)
> 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:57)
> at org.apache.falcon.FalconServer.main(FalconServer.java:118)
> Caused by: java.lang.reflect.InvocationTargetException
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at com.tinkerpop.blueprints.GraphFactory.open(GraphFactory.java:45)
> ... 15 more
> Caused by: java.lang.IllegalStateException: Need to set configuration value:
> root.storage.backend
> at
> com.google.common.base.Preconditions.checkState(Preconditions.java:172)
> at
> com.thinkaurelius.titan.diskstorage.configuration.ConfigOption.get(ConfigOption.java:158)
> at
> com.thinkaurelius.titan.diskstorage.configuration.BasicConfiguration.get(BasicConfiguration.java:56)
> at
> com.thinkaurelius.titan.diskstorage.Backend.getStorageManager(Backend.java:361)
> at
> com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.<init>(GraphDatabaseConfiguration.java:1275)
> at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:93)
> at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:73)
> ... 20 more
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