一、问题描述
新部署的flume在启动时候报错：java.lang.NoSuchMethodError: com.google.common.base.Preconditions.checkArgument(ZLjava/lang/String;Ljava/lang/Object;)V
2020-06-30 11:40:20,359 (SinkRunner-PollingRunner-DefaultSinkProcessor) [ERROR - org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:459)] process failed
java.lang.NoSuchMethodError: com.google.common.base.Preconditions.checkArgument(ZLjava/lang/String;Ljava/lang/Object;)V
at org.apache.hadoop.conf.Configuration.set(Configuration.java:1357)
at org.apache.hadoop.conf.Configuration.set(Configuration.java:1338)
at org.apache.hadoop.conf.Configuration.setBoolean(Configuration.java:1679)
at org.apache.flume.sink.hdfs.BucketWriter.open(BucketWriter.java:221)
at org.apache.flume.sink.hdfs.BucketWriter.append(BucketWriter.java:572)
at org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:412)
at org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:67)
at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:145)
at java.lang.Thread.run(Thread.java:748)
Exception in thread "SinkRunner-PollingRunner-DefaultSinkProcessor" java.lang.NoSuchMethodError: com.google.common.base.Preconditions.checkArgument(ZLjava/lang/String;Ljava/lang/Object;)V
at org.apache.hadoop.conf.Configuration.set(Configuration.java:1357)
at org.apache.hadoop.conf.Configuration.set(Configuration.java:1338)
at org.apache.hadoop.conf.Configuration.setBoolean(Configuration.java:1679)
at org.apache.flume.sink.hdfs.BucketWriter.open(BucketWriter.java:221)
at org.apache.flume.sink.hdfs.BucketWriter.append(BucketWriter.java:572)
at org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:412)
at org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:67)
at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:145)
报错截图：
问题解决：
一般这类问题，classNotFound,不是少jar包，那就是jar包冲突，查看flume安装目录下lib下面查看是有guava这个包的：
排除少包jar包的问题，那就是jar包冲突，在查看，本地环境hadoop目录下lib中也是有这个guava这个包：
显然是二者版本不一致导致的
问题解决：
找到原因之后，那就有解决办法了
将原有的flume中的低版本的guava包移除，然后拷贝hadoop/lib目录下的高版本的jar包到flume/lib中：
完成上述两步操作之后，然后重新启动flume，报错消失
