Unknown configuration element in namespace [root.storage]: hbase

[subs4...@gmail.com]

I am trying to use Titan 0.5 GA with hbase as backend and using Graph of Gods sample program to test it. When I run the java program it worked fine, however when I wrote the same program in Scala (2.11 version) then I get the above error for hbase configuration element for property "storage.hbase.table". 

My test code -

    def create(): TitanGraph = {

    println("Building Titan Graph - GreekGods")

        var config:TitanFactory.Builder = TitanFactory.build()

        config.set("storage.backend","hbase")

        config.set("storage.hostname","localhost")

        config.set("storage.hbase.table","GreekGods") // this is the line where exception is thrown for hbase being part of "storage.hbase.table" property name

       

        println("Opening Titan Graph - GreekGods")

        var graph:TitanGraph  = config.open()

        println("Loading Titan Graph - GreekGods")

        //GraphOfTheGodsFactory1.load(graph)

        return graph

    }  

Error I am getting - 

[error] (run-main-0) java.lang.IllegalArgumentException: Unknown configuration element in namespace [root.storage]: hbase

java.lang.IllegalArgumentException: Unknown configuration element in namespace [root.storage]: hbase

at com.google.common.base.Preconditions.checkArgument(Preconditions.java:120)

at com.thinkaurelius.titan.diskstorage.configuration.ConfigElement.parse(ConfigElement.java:168)

at com.thinkaurelius.titan.diskstorage.configuration.UserModifiableConfiguration.set(UserModifiableConfiguration.java:81)

at com.thinkaurelius.titan.core.TitanFactory$Builder.set(TitanFactory.java:124)

at GraphOfTheGodsFactory1$.create(GraphOfTheGodsFactory1.scala:21)

at GraphOfTheGodsFactory1$.main(GraphOfTheGodsFactory1.scala:133)

at GraphOfTheGodsFactory1.main(GraphOfTheGodsFactory1.scala)

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)

[Kishore Senji]

Looks like there was some issue when loading ConfigOptions via ReflectiveConfigOptionLoader. Did you see any errors prior to IllegalArgumentException?

[subs4...@gmail.com]

No there is no error before that. I am also expecting this related to something related to reflection hence some version compatibility between scala and jdk but not able to figure it out. 

[Dan LaRocque]

Hi,

This is probably ReflectiveConfigOptionLoader failing in your runtime environment, as you guys inferred.  I recently rewrote that class in 0.5.1-SNAPSHOT on the titan05 branch to make it an order of magnitude faster in most cases, allow customization of the classloader chain that it uses, and to provide several ways to disable it.  It also no longer uses the "java.class.path" system property indirectly through the Reflections library, which I bet is causing problems in this case.

Please try inserting `println(com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.HBASE_TABLE.toString())` before calling set("storage.hbase.table",...) in your snippet below.  The idea is to force the static initializer on HBASE_TABLE to evaluate prior to calling set, which should allow the string key to resolve.  ReflectiveConfigOptionLoader tries to do this in 0.5.0 inside TitanFactory.build, but it's failing, probably because java.class.path does not contain the titan-hbase jar.

I think this is already fixed in titan05 -- no println workaround required -- and could point you at specific commits (or you could take the current HEAD) if you want to test it out in a devel environment.

thanks,
Dan

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[subs4...@gmail.com]

Thanks Dan, that worked !

However I am curios why it was not working earlier as I am already using 0.5 GA. Is titan05 is different branch then 0.5 GA version?

[Dan LaRocque]

On 09/02/2014 06:39 PM, subs4...@gmail.com wrote:

Thanks Dan, that worked !

However I am curios why it was not working earlier as I am already using 0.5 GA. Is titan05 is different branch then 0.5 GA version?

Hi,

In my previous message and in this message, "titan05" means the git branch with that name: https://github.com/thinkaurelius/titan/tree/titan05.

The git branch titan05 is not identical to 0.5.0 GA.  At present, titan05 is 0.5.0 GA plus subsequent changes that will eventually become part of 0.5.1.  titan05 is not a release; it should be treated as an evolving development branch and potentially unstable.

If you're uncertain, then I would strongly suggest sticking with 0.5.0 GA and avoiding titan05.

thanks,
Dan

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[subs4...@gmail.com]

Sure, Thanks Dan. Appreciated this !