我已经在windows中配置了用kerberos保护的hadoop-2.6.0。一切正常。但是当我执行下面的命令

hdfs fsck /

我得到以下例外。
例外

通过连接到namenodehttps://hostname：50470线程“main”javax.net.ssl.sslhandshakeexception中的异常：sun.security.val idator.validatorexception:在sun.security.ssl.alerts.getsslexception（警报）中找不到受信任的证书。java:192)在sun.security.ssl.sslsocketimpl.fatal（sslsocketimpl。java:1884)在sun.security.ssl.handshaker.fatalse（握手器。java:276)在sun.security.ssl.handshaker.fatalse（握手器。java:270)在sun.security.ssl.clienthandshaker.servercertificate（clienthandshaker。java:1341)在sun.security.ssl.clienthandshaker.processmessage（clienthandshaker.java:153）在sun.security.ssl.handshaker.processloop（handshaker。java:868)在sun.security.ssl.handshaker.process\u record（handshaker。java:804)在sun.security.ssl.sslsocketimpl.readrecord（sslsocketimpl。java:1016)在sun.security.ssl.sslsocketimpl.performitialhandshake（sslsocketimpl。java:1312)在sun.security.ssl.sslsocketimpl.startAndShake（sslsocketimpl。java:1339 )在sun.security.ssl.sslsocketimpl.startAndShake（sslsocketimpl。java:1323 )在sun.net。www.protocol.https.httpsclient.afterconnect（httpsclient.java:563）位于sun.net。www.protocol.https.abstractdelegatehttpsurlconnection.connect （abstractdelegatehttpsurlconnection。java:185)在sun.net。www.protocol.https.httpsurlconnectionimpl.connect（httpsurlcon连接模板。java:153)在org.apache.hadoop.security.authentication.client.kerberosauthenticato r.authenticate（kerberosauthenticator。java:186)位于org.apache.hadoop.security.authentication.client.authenticatedurl.open连接（authenticatedurl。java:216)网址：org.apache.hadoop.hdfs.web.urlconnectionfactory.openconnection（urlconnectionfactory）。java:164)在org.apache.hadoop.hdfs.tools.dfsck.dowork（dfsck。java:303)访问org.apache.hadoop.hdfs.tools.dfsck.access$000（dfsck。java:72)在org.apache.hadoop.hdfs.tools.dfsck$1.run（dfsck。java:145)在org.apache.hadoop.hdfs.tools.dfsck$1.run（dfsck。java:142)位于javax.security.auth.subject.doas（subject）的java.security.accesscontroller.doprivileged（本机方法）。java:415)在org.apache.hadoop.security.usergroupinformation.doas（usergroupinformation。java:1628)在org.apache.hadoop.hdfs.tools.dfsck.run（dfsck。java:141)在org.apache.hadoop.util.toolrunner.run（toolrunner。java:70)在org.apache.hadoop.util.toolrunner.run（toolrunner。java:84)在org.apache.hadoop.hdfs.tools.dfsck.main（dfsck。java:341)原因：sun.security.validator.validatorexception:sun.security.validator.simplevalidator.buildtrustedchain（simplevalidator）没有受信任的证书。java:384) 在sun.security.validator.simplevalidator.enginevalidate（simplevalidator。java:134)在sun.security.validator.validator.validate（validator。java:260)在sun.security.ssl.x509trustmanagerimpl.validate（x509trustmanagerimpl.java:326)在sun.security.ssl.x509trustmanagerimpl.checktrusted（x509trustmanagerimpl。java:231)在sun.security.ssl.x509trustmanagerimpl.checkservertrusted（x509trustman.impl。java:107)位于org.apache.hadoop.security.ssl.reloadingx509trustmanager.checkservert rusted（reloadingx509trustmanager）。java:129)位于sun.security.ssl.abstractTrustManagerRapper.checkservertrusted（sslco ntextimpl。java:813)在sun.security.ssl.clienthandshaker.servercertificate（clienthandshaker。java:1323) ... 24个以上
我已从默认浏览器导出证书，并使用以下命令将其添加到密钥库中，但仍面临相同的错误。

keytool -import -alias nncert -keystore c:\Java\jre\lib\security\cacerts -file nn.crt

帮我解决这个问题。
谢谢。