我正在尝试在我的hadoop 2.7.6上安装Dr.Elephant2.1.7，并在运行我的./start ../app-conf命令以启动Dr. Elephant时，在dr.logs中收到此错误虽然我得到博士的消息。大象开始了。 我一直在尝试编辑各种配置文件，但是没有用，我还从dr-elephant-2.1.7文件夹的app-conf中的所有xml文件中删除了spark和tez xml标记。
OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0
OpenJDK 64-Bit Server VM warning: Cannot open file /home/hadoop/dr-elephant-2.1.7../logs/elephant/dr-gc.201807171612 due to No such file or directory
Play server process ID is 22293
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/hadoop/dr-elephant-2.1.7/lib/ch.qos.logback.logback-classic-1.0.13.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/hadoop/dr-elephant-2.1.7/lib/org.slf4j.slf4j-simple-1.6.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/hadoop/dr-elephant-2.1.7/lib/org.slf4j.slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/hadoop/hadoop-2.7.6/share/hadoop/common/lib/slf4j-log4j12-1.7.10.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 [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
[info] play - database [default] connected at jdbc:mysql://localhost/drelephant?characterEncoding=UTF-8
[info] application - Starting Application...
Oops, cannot start the server.
java.lang.RuntimeException: Could not invoke class com.linkedin.drelephant.mapreduce.fetchers.MapReduceFetcherHadoop2
at com.linkedin.drelephant.ElephantContext.loadFetchers(ElephantContext.java:189)
at com.linkedin.drelephant.ElephantContext.loadConfiguration(ElephantContext.java:110)
at com.linkedin.drelephant.ElephantContext.<init>(ElephantContext.java:101)
at com.linkedin.drelephant.ElephantContext.instance(ElephantContext.java:94)
at com.linkedin.drelephant.DrElephant.<init>(DrElephant.java:42)
at Global.onStart(Global.java:43)
at play.core.j.JavaGlobalSettingsAdapter.onStart(JavaGlobalSettingsAdapter.scala:18)
at play.api.GlobalPlugin.onStart(GlobalSettings.scala:203)
at play.api.Play$$anonfun$start$1$$anonfun$apply$mcV$sp$1.apply(Play.scala:88)
at play.api.Play$$anonfun$start$1$$anonfun$apply$mcV$sp$1.apply(Play.scala:88)
at scala.collection.immutable.List.foreach(List.scala:318)
at play.api.Play$$anonfun$start$1.apply$mcV$sp(Play.scala:88)
at play.api.Play$$anonfun$start$1.apply(Play.scala:88)
at play.api.Play$$anonfun$start$1.apply(Play.scala:88)
at play.utils.Threads$.withContextClassLoader(Threads.scala:18)
at play.api.Play$.start(Play.scala:87)
at play.core.StaticApplication.<init>(ApplicationProvider.scala:52)
at play.core.server.NettyServer$.createServer(NettyServer.scala:243)
at play.core.server.NettyServer$$anonfun$main$3.apply(NettyServer.scala:279)
at play.core.server.NettyServer$$anonfun$main$3.apply(NettyServer.scala:274)
at scala.Option.map(Option.scala:145)
at play.core.server.NettyServer$.main(NettyServer.scala:274)
at play.core.server.NettyServer.main(NettyServer.scala)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.linkedin.drelephant.ElephantContext.loadFetchers(ElephantContext.java:168)
... 22 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:204)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
at sun.net.www.http.HttpClient.New(HttpClient.java:339)
at sun.net.www.http.HttpClient.New(HttpClient.java:357)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
at com.linkedin.drelephant.mapreduce.fetchers.MapReduceFetcherHadoop2$URLFactory.verifyURL(MapReduceFetcherHadoop2.java:172)
at com.linkedin.drelephant.mapreduce.fetchers.MapReduceFetcherHadoop2$URLFactory.<init>(MapReduceFetcherHadoop2.java:166)
at com.linkedin.drelephant.mapreduce.fetchers.MapReduceFetcherHadoop2$URLFactory.<init>(MapReduceFetcherHadoop2.java:160)
at com.linkedin.drelephant.mapreduce.fetchers.MapReduceFetcherHadoop2.<init>(MapReduceFetcherHadoop2.java:59)
... 27 more