基於nutch的抓取服務，最近把nutch1.13升級到1.16， 升級後本地運行成功，遠程運行失敗，錯誤如下：
2019-11-21 16:20:22,452 FATAL [main] org.apache.hadoop.mapreduce.v2.app.MRAppMaster: Error starting MRAppMaster
java.lang.NoSuchMethodError: com.google.common.base.Objects.toStringHelper(Ljava/lang/Object;)Lcom/google/common/base/Objects$ToStringHelper;
at org.apache.hadoop.metrics2.lib.MetricsRegistry.toString(MetricsRegistry.java:406)
at java.lang.String.valueOf(String.java:2994)
at java.lang.StringBuilder.append(StringBuilder.java:131)
at org.apache.hadoop.ipc.metrics.RpcMetrics.<init>(RpcMetrics.java:74)
at org.apache.hadoop.ipc.metrics.RpcMetrics.create(RpcMetrics.java:80)
at org.apache.hadoop.ipc.Server.<init>(Server.java:2218)
at org.apache.hadoop.ipc.RPC$Server.<init>(RPC.java:938)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server.<init>(ProtobufRpcEngine.java:534)
at org.apache.hadoop.ipc.ProtobufRpcEngine.getServer(ProtobufRpcEngine.java:509)
at org.apache.hadoop.ipc.RPC$Builder.build(RPC.java:783)
at org.apache.hadoop.yarn.factories.impl.pb.RpcServerFactoryPBImpl.createServer(RpcServerFactoryPBImpl.java:169)
at org.apache.hadoop.yarn.factories.impl.pb.RpcServerFactoryPBImpl.getServer(RpcServerFactoryPBImpl.java:132)
at org.apache.hadoop.yarn.ipc.HadoopYarnProtoRPC.getServer(HadoopYarnProtoRPC.java:65)
at org.apache.hadoop.mapreduce.v2.app.client.MRClientService.serviceStart(MRClientService.java:119)
at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceStart(MRAppMaster.java:1107)
at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$4.run(MRAppMaster.java:1519)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.initAndStartAppMaster(MRAppMaster.java:1515)
at org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main(MRAppMaster.java:1448)
2019-11-21 16:20:22,455 INFO [main] org.apache.hadoop.util.ExitUtil: Exiting with status 1
看了下依賴，<dependency org="com.google.guava" name="guava" rev="25.0-jre" />，
確實裏面已經沒有 ToStringHelper 方法了。
改回之前的版本，<dependency org="com.google.guava" name="guava" rev="18.0" />。
編譯成功，順利運行。