如何在 1.0.0 中使用 TitanCleanup？

Question

我正在做一个学校项目，我们一直在试验一些批量加载脚本。但是，我需要一种方法来清除所有顶点、边和属性的 Titan 数据库以重新开始。据我所知， TitanCleanup.clear() 是这样做的方法。但是每当我通过 gremlin 并关闭图表时，调用 TitanCleanup.clear(graph) 只会导致 groovysh_evaluate 错误。除了只是说明它的作用的 Titan 文档之外，我们找不到任何更好的使用 TitanCleanup 的文档。任何示例或指向何处查看的指针将不胜感激。

编辑：这是我放入 gremlin 的全部内容，包括堆栈跟踪

gremlin> g = TitanFactory.open('./conf/titan-hbase.properties')
==>standardtitangraph[hbase:[hadoop-16.csse.rose-hulman.edu]]
gremlin> g.close()
==>null
gremlin> TitanCleanup.clear(g)
No such property: TitanCleanup for class: groovysh_evaluate
Display stack trace? [yN] y
groovy.lang.MissingPropertyException: No such property: TitanCleanup for class: groovysh_evaluate
        at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:51)
        at org.codehaus.groovy.runtime.callsite.PogoGetPropertySite.getProperty(PogoGetPropertySite.java:49)
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:304)
        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.tools.shell.Shell.leftShift(Shell.groovy:119)
        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:498)
        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.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:498)
        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.<init>(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)

Answer 1

您需要在使用之前导入 TitanCleanup 类：

gremlin> import com.thinkaurelius.titan.core.util.TitanCleanup

关闭图表后（正如您已经在做的那样），您应该能够成功运行TitanCleanup.clear(g)。