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我已配置Solr群集指向Zookeeper与Kerberos身份验证，一切看起来不错，但开始solr服务时，我正在日志中获取以下异常。无法启动Solr与Zookeeker Kerberos群集 - bootstrap_confdir必须是目录
2017-09-05 17:09:39.015 INFO (main) [ ] o.a.s.c.Overseer Overseer (id=2427206981745377 solrHost:8983_solr-n_0000000021) starting
2017-09-05 17:09:39.093 INFO (main) [ ] o.a.s.c.ZkController Register node as live in ZooKeeper:/live_nodes/solrHost:8983_solr
2017-09-05 17:09:39.098 ERROR (main) [ ] o.a.s.s.SolrDispatchFilter Could not start Solr. Check solr/home property and the logs
2017-09-05 17:09:39.099 INFO (OverseerStateUpdate-242720698174537786-hostname:8983_solr-n_0000000021) [ ] o.a.s.c.c.ZkStateReader Updated live nodes from ZooKeeper... (0) -> (1)
2017-09-05 17:09:39.114 ERROR (main) [ ] o.a.s.c.SolrCore null:java.lang.IllegalArgumentException: bootstrap_confdir must be a directory of configuration files
at org.apache.solr.core.ZkContainer.initZooKeeper(ZkContainer.java:137)
at org.apache.solr.core.CoreContainer.load(CoreContainer.java:477)
at org.apache.solr.servlet.SolrDispatchFilter.createCoreContainer(SolrDispatchFilter.java:237)
at org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:169)
at org.eclipse.jetty.servlet.FilterHolder.initialize(FilterHolder.java:137)
at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:873)
at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:349)
at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1404)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1366)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:778)
at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:262)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:520)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.deploy.bindings.StandardStarter.processBinding(StandardStarter.java:41)
at org.eclipse.jetty.deploy.AppLifeCycle.runBindings(AppLifeCycle.java:188)
at org.eclipse.jetty.deploy.DeploymentManager.requestAppGoal(DeploymentManager.java:499)
at org.eclipse.jetty.deploy.DeploymentManager.addApp(DeploymentManager.java:147)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider.fileAdded(ScanningAppProvider.java:180)
at org.eclipse.jetty.deploy.providers.WebAppProvider.fileAdded(WebAppProvider.java:458)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider$1.fileAdded(ScanningAppProvider.java:64)
at org.eclipse.jetty.util.Scanner.reportAddition(Scanner.java:610)
at org.eclipse.jetty.util.Scanner.reportDifferences(Scanner.java:529)
at org.eclipse.jetty.util.Scanner.scan(Scanner.java:392)
at org.eclipse.jetty.util.Scanner.doStart(Scanner.java:313)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider.doStart(ScanningAppProvider.java:150)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.deploy.DeploymentManager.startAppProvider(DeploymentManager.java:561)
at org.eclipse.jetty.deploy.DeploymentManager.doStart(DeploymentManager.java:236)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:131)
at org.eclipse.jetty.server.Server.start(Server.java:422)
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:113)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
at org.eclipse.jetty.server.Server.doStart(Server.java:389)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1516)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:1441)
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.eclipse.jetty.start.Main.invokeMain(Main.java:214)
at org.eclipse.jetty.start.Main.start(Main.java:457)
at org.eclipse.jetty.start.Main.main(Main.java:75)
2017-09-05 17:09:39.134 INFO (main) [ ] o.e.j.s.Server Started @11359ms
我当然不确定在这个时候应该在哪里定义bootstrap_confdir？
这种例外可能是什么原因？
谢谢。