目录
problems_flume
1 kafka-console-consumer接收不到flume推送过来的消息
原因和解决方法：需要先启动kafka，再启动flume，两者启动有先后顺序。
2 flume启动报错
desc:
执行flume-ng agent -c conf -f conf/load_balancer_server.conf -n a1 -Dflume.root.logger=DEBUG,console ，报错
errorlog:
org.apache.flume.FlumeException: Failed to set up server socket
at org.apache.flume.source.AvroSource.start(AvroSource.java:248)
at org.apache.flume.source.EventDrivenSourceRunner.start(EventDrivenSourceRunner.java:44)
at org.apache.flume.lifecycle.LifecycleSupervisor$MonitorRunnable.run(LifecycleSupervisor.java:249)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.jboss.netty.channel.ChannelException: Failed to bind to: node03/192.168.8.120:52020
at org.jboss.netty.bootstrap.ServerBootstrap.bind(ServerBootstrap.java:272)
at org.apache.avro.ipc.NettyServer.<init>(NettyServer.java:106)
at org.apache.flume.source.AvroSource.start(AvroSource.java:243)
... 9 more
Caused by: java.net.BindException: Address already in use
RCA: 上一次的flume进程还未关闭。
执行jps可以看到4191 Application ，这个就是flume的进程。原因是关闭flume时，使用了Ctrl+Z，所以导致前台关闭了flume，但是后台进程未关闭。
solution: kill -9 4191. 另外，下次关闭flume，尽量使用Ctrl+C。
3 （未解决）flume监控目录，抓取文件内容推送给kafka，报错
desc: flume监控目录，抓取文件内容推送给kafka，报错：
errorlog:
/datas/destFile/220104_YT1013_8c5f13f33c299316c6720cc51f94f7a0_2016101912_318.txt
2019-08-06 23:04:31,434 (pool-3-thread-1) [ERROR - org.apache.flume.source.SpoolDirectorySource$SpoolDirectoryRunnable.run(SpoolDirectorySource.java:280)] FATAL: Spool Directory source r1: { spoolDir: /datas/destFile }: Uncaught exception in SpoolDirectorySource thread. Restart or reconfigure Flume to continue processing.
java.nio.charset.MalformedInputException: Input length = 1
at java.nio.charset.CoderResult.throwException(CoderResult.java:281)
at org.apache.flume.serialization.ResettableFileInputStream.readChar(ResettableFileInputStream.java:283)
at org.apache.flume.serialization.LineDeserializer.readLine(LineDeserializer.java:132)
at org.apache.flume.serialization.LineDeserializer.readEvent(LineDeserializer.java:70)
at org.apache.flume.serialization.LineDeserializer.readEvents(LineDeserializer.java:89)
at org.apache.flume.client.avro.ReliableSpoolingFileEventReader.readDeserializerEvents(ReliableSpoolingFileEventReader.java:343)
at org.apache.flume.client.avro.ReliableSpoolingFileEventReader.readEvents(ReliableSpoolingFileEventReader.java:331)
at org.apache.flume.source.SpoolDirectorySource$SpoolDirectoryRunnable.run(SpoolDirectorySource.java:250)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
正常处理完文件后，应该删除该文件，应该提示这个信息：
2019-08-06 23:04:31,412 (pool-3-thread-1) [INFO - org.apache.flume.client.avro.ReliableSpoolingFileEventReader.deleteCurrentFile(ReliableSpoolingFileEventReader.java:492)] Preparing to delete file
问题原因：文件的字符集编码是UTF-8，要手动设置一下字符集编码。
解决方案：a1.sources.r1.inputCharset = UTF-8 //将server.properties配置文件中的 inputCharset 设置为 UTF-8
还是没用，未解决。
貌似修复了程序的bug，这个问题就没再发生了，不过又有新的问题出现了：
2019-08-07 01:41:45,377 (pool-3-thread-1) [ERROR - org.apache.flume.source.SpoolDirectorySource$SpoolDirectoryRunnable.run(SpoolDirectorySource.java:280)] FATAL: Spool Directory source r1: { spoolDir: /datas/destFile }: Uncaught exception in SpoolDirectorySource thread. Restart or reconfigure Flume to continue processing.
java.lang.IllegalStateException: File has been modified since being read: /datas/destFile/220605_YT1013_ba701bb6bf74afb2f14a92de320bc023_2016101808_113.txt
at org.apache.flume.client.avro.ReliableSpoolingFileEventReader.retireCurrentFile(ReliableSpoolingFileEventReader.java:406)
at org.apache.flume.client.avro.ReliableSpoolingFileEventReader.readEvents(ReliableSpoolingFileEventReader.java:326)
at org.apache.flume.source.SpoolDirectorySource$SpoolDirectoryRunnable.run(SpoolDirectorySource.java:250)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
^C2019-08-07 01:42:11,310 (agent-shutdown-hook) [INFO - org.apache.flume.lifecycle.LifecycleSupervisor.stop(LifecycleSupervisor.java:78)] Stopping lifecycle supervisor 10
2019-08-07 01:42:11,320 (agent-shutdown-hook) [INFO - org.apache.flume.instrumentation.MonitoredCounterGroup.stop(MonitoredCounterGroup.java:149)] Component type: CHANNEL, name: c1 stopped