四（1）、flume遇到的问题
1、在cdh启动了flume的情况下，在linux运行了命令：
flume-ng agent --conf conf --conf-file conf/flume-conf.properties --name a1 -Dflume.root.logger=INFO,console
配置文件1：flume-conf.properties
a1.sources = r1
a1.sinks = s1
a1.channels = c1
#sources 消息生产
a1.sources.r1.type = spooldir
a1.sources.r1.channels = c1
a1.sources.r1.spoolDir = /data/flume/flume_dir //用于存放收集的日志
a1.sources.r1.fileHeader = false
a1.sources.r1.interceptors = i1
a1.sources.r1.interceptors.i1.type = timestamp
#channels 消息传递
a1.channels.c1.type = memory
a1.channels.c1.capacity = 1000
a1.channels.c1.transactionCapacity = 100
#sinks 消息消费
a1.sinks.s1.type = org.apache.flume.sink.kafka.KafkaSink
a1.sinks.s1.brokerList = node01:9092 //链接kafka
a1.sinks.s1.topics = from_flume//flume收集的日志分发给kafka的对应主题名称
a1.sinks.s1.requiredAcks = 1
a1.sinks.s1.batchSize = 20
a1.sinks.s1.channel = c1 //注意这里是channel不是channels
报错：
[root@node01 flume-ng]# flume-ng agent --conf conf --conf-file conf/flume-conf.properties --name a1 -Dflume.root.logger=INFO,console
Info: Including Hadoop libraries found via (/bin/hadoop) for HDFS access
Info: Including HBASE libraries found via (/opt/cloudera/parcels/CDH-6.0.1-1.cdh6.0.1.p0.590678/lib/hbase/bin/hbase) for HBASE access
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
(这两个个Error每次启动都有报，但是不影响)
Error: Could not find or load main class org.apache.flume.tools.GetJavaProperty
Error: Could not find or load main class org.apache.hadoop.hbase.util.GetJavaProperty
Info: Including Hive libraries found via () for Hive access
org.apache.flume.conf.ConfigurationException: Channel c1 not in active set.
at org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.validateSinks(FlumeConfiguration.java:685)
at org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.isValid(FlumeConfiguration.java:347)
at org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.access$000(FlumeConfiguration.java:212)
at org.apache.flume.conf.FlumeConfiguration.validateConfiguration(FlumeConfiguration.java:126)
at org.apache.flume.conf.FlumeConfiguration.(FlumeConfiguration.java:108)
at org.apache.flume.node.PropertiesFileConfigurationProvider.getFlumeConfiguration(PropertiesFileConfigurationProvider.java:194)
at org.apache.flume.node.AbstractConfigurationProvider.getConfiguration(AbstractConfigurationProvider.java:93)
at org.apache.flume.node.PollingPropertiesFileConfigurationProvider$FileWatcherRunnable.run(PollingPropertiesFileConfigurationProvider.java:145)
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$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
2019-03-13 18:45:11,822 (conf-file-poller-0) [INFO - org.apache.flume.conf.FlumeConfiguration.validateConfiguration(FlumeConfiguration.java:140)] Post-validation flume configuration contains configuration for agents: [a1]
2019-03-13 18:45:11,822 (conf-file-poller-0) [INFO - org.apache.flume.node.AbstractConfigurationProvider.loadChannels(AbstractConfigurationProvider.java:147)] Creating channels
2019-03-13 18:45:11,835 (conf-file-poller-0) [INFO - org.apache.flume.channel.DefaultChannelFactory.create(DefaultChannelFactory.java:42)] Creating instance of channel c1 type memory
2019-03-13 18:45:11,838 (conf-file-poller-0) [INFO - org.apache.flume.node.AbstractConfigurationProvider.loadChannels(AbstractConfigurationProvider.java:201)] Created channel c1
2019-03-13 18:45:11,839 (conf-file-poller-0) [INFO - org.apache.flume.source.DefaultSourceFactory.create(DefaultSourceFactory.java:41)] Creating instance of source r1, type spooldir
2019-03-13 18:45:11,844 (conf-file-poller-0) [ERROR - org.apache.flume.node.PollingPropertiesFileConfigurationProvider$FileWatcherRunnable.run(PollingPropertiesFileConfigurationProvider.java:147)] Failed to load configuration data. Exception follows.
org.apache.flume.FlumeException: Unable to load source type: spooldir , class: spooldir
at org.apache.flume.source.DefaultSourceFactory.getClass(DefaultSourceFactory.java:68)
at org.apache.flume.source.DefaultSourceFactory.create(DefaultSourceFactory.java:42)
at org.apache.flume.node.AbstractConfigurationProvider.loadSources(AbstractConfigurationProvider.java:323)
at org.apache.flume.node.AbstractConfigurationProvider.getConfiguration(AbstractConfigurationProvider.java:101)
at org.apache.flume.node.PollingPropertiesFileConfigurationProvider$FileWatcherRunnable.run(PollingPropertiesFileConfigurationProvider.java:145)
at java.util.concurrent.Executors$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$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: spooldir
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.apache.flume.source.DefaultSourceFactory.getClass(DefaultSourceFactory.java:66)
... 11 more
把空的行去掉之后，报另外的错：
2019-03-18 16:08:38,428 (kafka-producer-network-thread | producer-1) [WARN - org.apache.kafka.common.utils.LogContext$KafkaLogger.warn(LogContext.java:246)] [Producer clientId=producer-1] Error while fetching metadata with correlation id 1 : {default-flume-topic=LEADER_NOT_AVAILABLE}
2019-03-18 16:08:38,543 (kafka-producer-network-thread | producer-1) [WARN - org.apache.kafka.common.utils.LogContext$KafkaLogger.warn(LogContext.java:246)] [Producer clientId=producer-1] Error while fetching metadata with correlation id 3 : {default-flume-topic=LEADER_NOT_AVAILABLE}
flume-ng agent --conf conf --conf-file conf/flume-conf01.properties --name tier1 -Dflume.root.logger=INFO,console
配置文件2：flume-conf01.properties，运行没问题（即使更改tier1 为其他名称），source、channel、sink都能正常启动，只是kafka消费不到数据
tier1.sources=r1
tier1.sinks=k1
tier1.channels=c1
tier1.sources.r1.type=spooldir
tier1.sources.r1.spoolDir=/data/flume/flume_dir/
tier1.sources.r1.channels=c1
tier1.sources.r1.fileHeader=false
tier1.sinks.k1.type=org.apache.flume.sink.kafka.KafkaSink
tier1.sinks.k1.brokerList=node01:9092
tier1.sinks.k1.topics=from_flume
tier1.sinks.k1.requiredAcks=1
tier1.sinks.k1.channel=c1
#tier1.sinks.k1.hdfs.fileType=DataStream
#tier1.sinks.k1.hdfs.writeFormat=TEXT
#tier1.sinks.k1.hdfs.rollInterval=60
#tier1.sinks.k1.channel=c1
tier1.channels.c1.type=memory
tier1.channels.c1.capacity=1000
tier1.channels.c1.transactionCapacity=100
#tier1.channels.c1.checkpointDir=./file_channel/checkpoint
#tier1.channels.c1.dataDirs=./file_channel/data
原因：是因为tier1.sinks.k1.topic写成了tier1.sinks.k1.topics，改回来之后，另外用的agent名称tier1是cdh上面agent默认的名称，执行的时候用tier1会报错：(No such file or directory)，找不到监控的目录文档，把tier1改成其他名字，比如a2，就可以正常执行了
PS:在过程中有删掉 kafka的数据：__consumer_offsets等文档，这个是分片的文档，分多少片就有多少个，同样的，在cm上配置的是50个，那么我创建topic的时候，即使指定了1个，但是分片数还是50个；
这个时候cm上kafka会报错，直接重启kafka就可以了