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https://issues.apache.org/jira/browse/FALCON-1984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15314234#comment-15314234
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ASF GitHub Bot commented on FALCON-1984:
----------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/falcon/pull/166
> Provide proper hint and documentation if required titan storage backend is
> not configured in startup.properties
> ---------------------------------------------------------------------------------------------------------------
>
> Key: FALCON-1984
> URL: https://issues.apache.org/jira/browse/FALCON-1984
> Project: Falcon
> Issue Type: Bug
> Reporter: Ying Zheng
> Assignee: Ying Zheng
> Fix For: trunk, 0.10
>
>
> We require the user to choose either HBase or BDB as titan storage backend,
> which is not set by default in startup.properties. The current Falcon only
> shows the following error in the log if the user doesn't configure the
> storage backend and start falcon with default startup.properties. This is not
> intuitive for the user to understand the server start error. Should provide
> proper hint and documentation.
> {code}
> 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
> {code}
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