（待整理）flume操作----------hivelogsToHDFS案例----------运行时，发生NoClassDefFoundError错误

1.

2.错误日志

命令为 bin/flume-ng agent --name a2 --conf conf/ --conf-file job/file-hdfs.conf 

Info: Sourcing environment configuration script /opt/modules/flume/conf/flume-env.sh
Info: Including Hive libraries found via () for Hive access
+ exec /opt/modules/jdk1.8.0_121/bin/java -Xmx20m -cp '/opt/modules/flume/conf:/opt/modules/flume/lib/*:/lib/*' -Djava.library.path= org.apache.flume.node.Application --name a2 --conf-file job/file-hdfs.conf
Exception in thread "SinkRunner-PollingRunner-DefaultSinkProcessor" java.lang.NoClassDefFoundError: org/apache/htrace/SamplerBuilder
        at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:635)
        at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:619)
        at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:149)
        at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2653)
        at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:92)
        at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2687)
        at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2669)

3.情况好转

把如图的两个jar放入flume下的lib目录

重新运行flume，没有报错，但是没有动静，如图

同时启动hive，在hdfs并没有产生/flume/%Y%m%d/%H目录

问题待解决！！！

4.进一步实验

把那两个jar移除，同时把conf中sink指定的02号机namenode关闭掉，再启动01号机上的flume，没有发生错误但是在hdfs上任然没有flume目录

猜想原因：能够不报错，可能是因为JVM记录着原来的变量？？？？？？

问题待解决！！！

案列3，发生同样的情况，HDFS上没有flume文件夹

在命令中加入了输出日志

bin/flume-ng agent --conf conf/ --name a3 --conf-file job/dir-hdfs.conf -Dflume.root.logger=INFO,console

发现错误日志

-- ::, (conf-file-poller-) [INFO - org.apache.flume.node.Application.startAllComponents(Application.java:)] Starting Source r3
-- ::, (lifecycleSupervisor--) [INFO - org.apache.flume.source.SpoolDirectorySource.start(SpoolDirectorySource.java:)] SpoolDirectorySource source starting with directory: /opt/module/flume/upload
-- ::, (lifecycleSupervisor--) [ERROR - org.apache.flume.lifecycle.LifecycleSupervisor$MonitorRunnable.run(LifecycleSupervisor.java:)] Unable to start EventDrivenSourceRunner: { source:Spool Directory source r3: { spoolDir: /opt/module/flume/upload } } - Exception follows.
java.lang.IllegalStateException: Directory does not exist: /opt/module/flume/upload
        at com.google.common.base.Preconditions.checkState(Preconditions.java:)
        at org.apache.flume.client.avro.ReliableSpoolingFileEventReader.<init>(ReliableSpoolingFileEventReader.java:)
        at org.apache.flume.client.avro.ReliableSpoolingFileEventReader.<init>(ReliableSpoolingFileEventReader.java:)

上述日志中错误原因是：

conf中少了s

改正之后重新运行flume：

同时上传NOTICE文件到upload中，此时upload文件中

但是flume打印出来的日志提示：

[ERROR - org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:447)] process failed
java.lang.NoClassDefFoundError: org/apache/htrace/SamplerBuilder

-- ::, (lifecycleSupervisor--) [INFO - org.apache.flume.instrumentation.MonitoredCounterGroup.start(MonitoredCounterGroup.java:)] Component type: SOURCE, name: r3 started
-- ::, (pool--thread-) [INFO - org.apache.flume.client.avro.ReliableSpoolingFileEventReader.readEvents(ReliableSpoolingFileEventReader.java:)] Last read took us just up to a file boundary. Rolling to the next file, if there is one.
-- ::, (pool--thread-) [INFO - org.apache.flume.client.avro.ReliableSpoolingFileEventReader.rollCurrentFile(ReliableSpoolingFileEventReader.java:)] Preparing to move file /opt/modules/flume/upload/NOTICE to /opt/modules/flume/upload/NOTICE.COMPLETED
-- ::, (SinkRunner-PollingRunner-DefaultSinkProcessor) [INFO - org.apache.flume.sink.hdfs.HDFSDataStream.configure(HDFSDataStream.java:)] Serializer = TEXT, UseRawLocalFileSystem = false
-- ::, (SinkRunner-PollingRunner-DefaultSinkProcessor) [INFO - org.apache.flume.sink.hdfs.BucketWriter.open(BucketWriter.java:)] Creating hdfs://hadoop-senior02.itguigu.com:9000/flume/upload/20190123/07/upload-.1548198334086.tmp
-- ::, (hdfs-k3-call-runner-) [WARN - org.apache.hadoop.util.NativeCodeLoader.<clinit>(NativeCodeLoader.java:)] Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
-- ::, (SinkRunner-PollingRunner-DefaultSinkProcessor) [ERROR - org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:)] process failed
java.lang.NoClassDefFoundError: org/apache/htrace/SamplerBuilder
        at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:)
        at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:)
        at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:)

经查询：flime/lib中缺少htrace-core-3.1.0-incubating.jar包，mvn工程的话，通过mvn install安装（参考http://blog.51cto.com/enetq/1827028）。我直接找到此jar包手动拷贝进lib/xia

上面问题解决了，继续：cp NOTICE upload/，但是flume报错，日志如下：

java.lang.NoClassDefFoundError: org/apache/commons/io/Charsets

Info: Sourcing environment configuration script /opt/modules/flume/conf/flume-env.sh
Info: Including Hive libraries found via () for Hive access
+ exec /opt/modules/jdk1..0_121/bin/java -Xmx20m -cp '/opt/modules/flume/conf:/opt/modules/flume/lib/*:/lib/*' -Djava.library.path= org.apache.flume.node.Application -n a3 -f job/dir-hdfs.conf
Exception in thread "SinkRunner-PollingRunner-DefaultSinkProcessor" java.lang.NoClassDefFoundError: org/apache/commons/io/Charsets
        at org.apache.hadoop.ipc.Server.<clinit>(Server.java:)
        at org.apache.hadoop.ipc.ProtobufRpcEngine.<clinit>(ProtobufRpcEngine.java:)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:)

解决：把commons-io-2.4.jar放进flume/lib/目录下

再重新过程，出现HDFS  IO error,见日志：

-- ::, (SinkRunner-PollingRunner-DefaultSinkProcessor) [WARN - org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:)] HDFS IO error
java.net.ConnectException: Call From hadoop-senior01/192.168.10.20 to hadoop-senior02: failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:)

（插曲）  因为file-hdfs.conf,之前也出现了问题，现在配置基本改好了。运行此配置出现，如日志所示问题：

xecutor.java:)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:)
        at java.lang.Thread.run(Thread.java:)
-- ::, (SinkRunner-PollingRunner-DefaultSinkProcessor) [INFO - org.apache.flume.sink.hdfs.BucketWriter.open(BucketWriter.java:)] Creating hdfs://hadoop-senior01/flume/20190123/15/logs-.1548230362663.tmp
-- ::, (SinkRunner-PollingRunner-DefaultSinkProcessor) [WARN - org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:)] HDFS IO error
org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.StandbyException): Operation category WRITE is not supported in state standby
        at org.apache.hadoop.hdfs.server.namenode.ha.StandbyState.checkOperation(StandbyState.java:)

打不开HA中的standby节点中的目录，改成active namenode之后，flume运行过程成功！

继续，dir-file.conf还是出问题，经对比file-file.conf（成功），dir-file.conf中指定了9000端口，去掉，成功！！！

a2.sinks.k2.hdfs.path = hdfs://hadoop-senior02/flume/%Y%m%d/
%H

有关参考：https://blog.csdn.net/dai451954706/article/details/50449436

https://blog.csdn.net/woloqun/article/details/81350323