I am trying to connect to Titan 1.0.0 with Hadoop 2 (HBase 1.0.2 client) (available in https://github.com/thinkaurelius/titan/wiki/Downloads) with Google Cloud Bigtable service, using its HBase client.
I could successfully connect to Bigtable from an HBase shell in a GCE instance, by following this procedure. The hbase-site.xml is according to the template, and I have downloaded Bigtable jars for ALPN_VERSION=8.1.5.v20150921 (Oracle JDK SE 1.8.0_60)
<configuration>
<property>
<name>hbase.client.connection.impl</name>
<value>com.google.cloud.bigtable.hbase1_0.BigtableConnection</value>
</property>
<property>
<name>google.bigtable.cluster.name</name>
<value>[YOUR-CLUSTER-ID]</value>
</property>
<property>
<name>google.bigtable.project.id</name>
<value>[YOUR-PROJECT-ID]</value>
</property>
<property>
<name>google.bigtable.zone.name</name>
<value>[YOUR-ZONE-NAME]</value>
</property>
</configuration>
Then, I copied hbase-site.xml to titan-1.0.0-hadoop2/conf directory, and Bigtable jars to titan-1.0.0-hadoop2/lib folder.
Then, on titan-1.0.0-hadoop2 folder, I run ./run/gremlin.sh and start the console.
Therefore, when trying to create a connection using HBase client (configured to point out to Bigtable cluster)...
TitanGraph graph = TitanFactory.build().set("storage.backend", "hbase").open();
...I get the following exception in the Gremlin console:
com.google.cloud.bigtable.hbase1_0.BigtableConnection cannot be cast to org.apache.hadoop.hbase.client.ClusterConnection
Here is the stack trace:
gremlin> TitanFactory.build().set("storage.backend", "hbase").open();
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/lib/titan-1.0.0-hadoop2/lib/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/lib/titan-1.0.0-hadoop2/lib/logback-classic-1.1.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
13:42:24 WARN org.apache.hadoop.util.NativeCodeLoader - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
13:42:25 WARN com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager - Unexpected exception during getDeployment()
java.lang.ClassCastException: com.google.cloud.bigtable.hbase1_0.BigtableConnection cannot be cast to org.apache.hadoop.hbase.client.ClusterConnection
at org.apache.hadoop.hbase.client.HBaseAdmin.(HBaseAdmin.java:225)
at com.thinkaurelius.titan.diskstorage.hbase.HConnection1_0.getAdmin(HConnection1_0.java:28)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.getAdminInterface(HBaseStoreManager.java:960)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.ensureTableExists(HBaseStoreManager.java:747)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.getLocalKeyPartition(HBaseStoreManager.java:556)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.getDeployment(HBaseStoreManager.java:347)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.getFeatures(HBaseStoreManager.java:389)
at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.(GraphDatabaseConfiguration.java:1321)
at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:94)
at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:84)
at com.thinkaurelius.titan.core.TitanFactory$Builder.open(TitanFactory.java:139)
at com.thinkaurelius.titan.core.TitanFactory$Builder$open$0.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:110)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:114)
at groovysh_evaluate.run(groovysh_evaluate:3)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.codehaus.groovy.tools.shell.Interpreter.evaluate(Interpreter.groovy:69)
at org.codehaus.groovy.tools.shell.Groovysh.execute(Groovysh.groovy:185)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.codehaus.groovy.tools.shell.Shell.leftShift(Shell.groovy:119)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.codehaus.groovy.tools.shell.ShellRunner.work(ShellRunner.groovy:94)
at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$work(InteractiveShellRunner.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1207)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:130)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:150)
at org.codehaus.groovy.tools.shell.InteractiveShellRunner.work(InteractiveShellRunner.groovy:123)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.codehaus.groovy.tools.shell.ShellRunner.run(ShellRunner.groovy:58)
at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$run(InteractiveShellRunner.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1207)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:130)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:150)
at org.codehaus.groovy.tools.shell.InteractiveShellRunner.run(InteractiveShellRunner.groovy:82)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.apache.tinkerpop.gremlin.console.Console.(Console.groovy:144)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.apache.tinkerpop.gremlin.console.Console.main(Console.groovy:303)
13:42:25 WARN com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager - Unexpected exception during getDeployment()
java.lang.ClassCastException: com.google.cloud.bigtable.hbase1_0.BigtableConnection cannot be cast to org.apache.hadoop.hbase.client.ClusterConnection
at org.apache.hadoop.hbase.client.HBaseAdmin.(HBaseAdmin.java:225)
at com.thinkaurelius.titan.diskstorage.hbase.HConnection1_0.getAdmin(HConnection1_0.java:28)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.getAdminInterface(HBaseStoreManager.java:960)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.ensureTableExists(HBaseStoreManager.java:747)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.getLocalKeyPartition(HBaseStoreManager.java:556)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.getDeployment(HBaseStoreManager.java:347)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.getFeatures(HBaseStoreManager.java:389)
at com.thinkaurelius.titan.diskstorage.Backend.getStandaloneGlobalConfiguration(Backend.java:438)
at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.(GraphDatabaseConfiguration.java:1322)
at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:94)
at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:84)
at com.thinkaurelius.titan.core.TitanFactory$Builder.open(TitanFactory.java:139)
at com.thinkaurelius.titan.core.TitanFactory$Builder$open$0.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:110)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:114)
at groovysh_evaluate.run(groovysh_evaluate:3)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.codehaus.groovy.tools.shell.Interpreter.evaluate(Interpreter.groovy:69)
at org.codehaus.groovy.tools.shell.Groovysh.execute(Groovysh.groovy:185)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.codehaus.groovy.tools.shell.Shell.leftShift(Shell.groovy:119)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.codehaus.groovy.tools.shell.ShellRunner.work(ShellRunner.groovy:94)
at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$work(InteractiveShellRunner.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1207)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:130)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:150)
at org.codehaus.groovy.tools.shell.InteractiveShellRunner.work(InteractiveShellRunner.groovy:123)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.codehaus.groovy.tools.shell.ShellRunner.run(ShellRunner.groovy:58)
at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$run(InteractiveShellRunner.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1207)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:130)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:150)
at org.codehaus.groovy.tools.shell.InteractiveShellRunner.run(InteractiveShellRunner.groovy:82)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.apache.tinkerpop.gremlin.console.Console.(Console.groovy:144)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.apache.tinkerpop.gremlin.console.Console.main(Console.groovy:303)
13:42:25 WARN com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager - Unexpected exception during getDeployment()
java.lang.ClassCastException: com.google.cloud.bigtable.hbase1_0.BigtableConnection cannot be cast to org.apache.hadoop.hbase.client.ClusterConnection
at org.apache.hadoop.hbase.client.HBaseAdmin.(HBaseAdmin.java:225)
at com.thinkaurelius.titan.diskstorage.hbase.HConnection1_0.getAdmin(HConnection1_0.java:28)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.getAdminInterface(HBaseStoreManager.java:960)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.ensureTableExists(HBaseStoreManager.java:747)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.getLocalKeyPartition(HBaseStoreManager.java:556)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.getDeployment(HBaseStoreManager.java:347)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.getFeatures(HBaseStoreManager.java:389)
at com.thinkaurelius.titan.diskstorage.common.AbstractStoreManager.getMetaDataSchema(AbstractStoreManager.java:44)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseKeyColumnValueStore.(HBaseKeyColumnValueStore.java:67)
at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.openDatabase(HBaseStoreManager.java:446)
at com.thinkaurelius.titan.diskstorage.keycolumnvalue.KeyColumnValueStoreManager.openDatabase(KeyColumnValueStoreManager.java:29)
at com.thinkaurelius.titan.diskstorage.Backend.getStandaloneGlobalConfiguration(Backend.java:449)
at com.thinkaurelius.titan.graphdb.configuration.GraphDatabaseConfiguration.(GraphDatabaseConfiguration.java:1322)
at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:94)
at com.thinkaurelius.titan.core.TitanFactory.open(TitanFactory.java:84)
at com.thinkaurelius.titan.core.TitanFactory$Builder.open(TitanFactory.java:139)
at com.thinkaurelius.titan.core.TitanFactory$Builder$open$0.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:110)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:114)
at groovysh_evaluate.run(groovysh_evaluate:3)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.codehaus.groovy.tools.shell.Interpreter.evaluate(Interpreter.groovy:69)
at org.codehaus.groovy.tools.shell.Groovysh.execute(Groovysh.groovy:185)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.codehaus.groovy.tools.shell.Shell.leftShift(Shell.groovy:119)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.codehaus.groovy.tools.shell.ShellRunner.work(ShellRunner.groovy:94)
at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$work(InteractiveShellRunner.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1207)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:130)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:150)
at org.codehaus.groovy.tools.shell.InteractiveShellRunner.work(InteractiveShellRunner.groovy:123)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.codehaus.groovy.tools.shell.ShellRunner.run(ShellRunner.groovy:58)
at org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$run(InteractiveShellRunner.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:324)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1207)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:130)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:150)
at org.codehaus.groovy.tools.shell.InteractiveShellRunner.run(InteractiveShellRunner.groovy:82)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.apache.tinkerpop.gremlin.console.Console.(Console.groovy:144)
at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:215)
at org.apache.tinkerpop.gremlin.console.Console.main(Console.groovy:303)
com.google.cloud.bigtable.hbase1_0.BigtableConnection cannot be cast to org.apache.hadoop.hbase.client.ClusterConnection
I've found other question with the same exception in other context: Unable to connect to Google Bigtable using HBase REST api .
Would that patch also solve this exception I am getting with Titan?
Titan is no longer maintained; however, you can use JanusGraph (a fork of Titan) together with Google Cloud Bigtable; see the following guides for details:
GitHub hosts the JanusGraph releases.
来源：https://stackoverflow.com/questions/33019247/cannot-connect-from-titan-to-google-bigtable-via-hbase-client