[Flume]使用 Flume 来传递web log 到 hdfs 的例子：
在 hdfs 上创建存储 log 的目录：
$ hdfs dfs -mkdir -p /test001/weblogsflume
指定log 输入的目录：
$ sudo mkdir -p /flume/weblogsmiddle
设定使得log 可以被任何用户访问：
$ sudo chmod a+w -R /flume
$
设置配置文件内容：
$ cat /mytraining/exercises/flume/spooldir.conf
#Setting component
agent1.sources = webserver-log-source
agent1.sinks = hdfs-sink
agent1.channels = memory-channel
#Setting source
agent1.sources.webserver-log-source.type = spooldir
agent1.sources.webserver-log-source.spoolDir = /flume/weblogsmiddle
agent1.sources.webserver-log-source.channels = memory-channel
#Setting sinks
agent1.sinks.hdfs-sink.type = hdfs
agent1.sinks.hdfs-sink.hdfs.path = /test001/weblogsflume/
agent1.sinks.hdfs-sink.channel = memory-channel
agent1.sinks.hdfs-sink.hdfs.rollInterval = 0
agent1.sinks.hdfs-sink.hdfs.rollSize = 524288
agent1.sinks.hdfs-sink.hdfs.rollCount = 0
agent1.sinks.hdfs-sink.hdfs.fileType = DataStream
#Setting channels
agent1.channels.memory-channel.type = memory
agent1.channels.memory-channel.capacity = 100000
agent1.channels.memory-channel.transactionCapacity = 1000
$cd /mytraining/exercises/flume/spooldir.conf
启动 Flume:
$ flume-ng agent --conf /etc/flume-ng/conf
> --conf-file spooldir.conf
> --name agent1 -Dflume.root.logger=INFO,console
Info: Sourcing environment configuration script /etc/flume-ng/conf/flume-env.sh
Info: Including Hadoop libraries found via (/usr/bin/hadoop) for HDFS access
Info: Excluding /usr/lib/hadoop/lib/slf4j-api-1.7.5.jar from classpath
Info: Excluding /usr/lib/hadoop/lib/slf4j-log4j12.jar from classpath
Info: Including HBASE libraries found via (/usr/bin/hbase) for HBASE access
Info: Excluding /usr/lib/hbase/bin/../lib/slf4j-api-1.7.5.jar from classpath
Info: Excluding /usr/lib/hbase/bin/../lib/slf4j-log4j12.jar from classpath
Info: Excluding /usr/lib/hadoop/lib/slf4j-api-1.7.5.jar from classpath
Info: Excluding /usr/lib/hadoop/lib/slf4j-log4j12.jar from classpath
Info: Excluding /usr/lib/hadoop/lib/slf4j-api-1.7.5.jar from classpath
Info: Excluding /usr/lib/hadoop/lib/slf4j-log4j12.jar from classpath
Info: Excluding /usr/lib/zookeeper/lib/slf4j-api-1.7.5.jar from classpath
Info: Excluding /usr/lib/zookeeper/lib/slf4j-log4j12-1.7.5.jar from classpath
Info: Excluding /usr/lib/zookeeper/lib/slf4j-log4j12.jar from classpath
Info: Including Hive libraries found via () for Hive access
...
-Djava.library.path=:/usr/lib/hadoop/lib/native:/usr/lib/hadoop/lib/native:/usr/lib/hbase/bin/../lib/native/Linux-amd64-64 org.apache.flume.node.Application --conf-file spooldir.conf --name agent1
2017-10-20 21:07:08,929 (lifecycleSupervisor-1-0) [INFO - org.apache.flume.node.PollingPropertiesFileConfigurationProvider.start(PollingPropertiesFileConfigurationProvider.java:61)] Configuration provider starting
2017-10-20 21:07:09,057 (conf-file-poller-0) [INFO - org.apache.flume.node.PollingPropertiesFileConfigurationProvider$FileWatcherRunnable.run(PollingPropertiesFileConfigurationProvider.java:133)] Reloading configuration file:spooldir.conf
2017-10-20 21:07:09,300 (conf-file-poller-0) [INFO - org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.addProperty(FlumeConfiguration.java:1017)] Processing:hdfs-sink
2017-10-20 21:07:09,302 (conf-file-poller-0) [INFO - org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.addProperty(FlumeConfiguration.java:1017)] Processing:hdfs-sink
2017-10-20 21:07:09,302 (conf-file-poller-0) [INFO - org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.addProperty(FlumeConfiguration.java:931)] Added sinks: hdfs-sink Agent: agent1
...
2017-10-20 21:07:09,304 (conf-file-poller-0) [INFO - org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.addProperty(FlumeConfiguration.java:1017)] Processing:hdfs-sink
2017-10-20 21:07:09,306 (conf-file-poller-0) [INFO - org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.addProperty(FlumeConfiguration.java:1017)] Processing:hdfs-sink
2017-10-20 21:07:09,310 (conf-file-poller-0) [INFO - org.apache.flume.conf.FlumeConfiguration$AgentConfiguration.addProperty(FlumeConfiguration.java:1017)] Processing:hdfs-sink
...
2017-10-20 21:07:10,398 (conf-file-poller-0)
[INFO - org.apache.flume.node.Application.startAllComponents(Application.java:138)] Starting new configuration:{ sourceRunners:{webserver-log-source=EventDrivenSourceRunner: { source:Spool Directory source webserver-log-source: { spoolDir: /flume/weblogsmiddle } }} sinkRunners:{hdfs-sink=SinkRunner: { policy:org.apache.flume.sink.DefaultSinkProcessor@12c67180 counterGroup:{ name:null counters:{} } }} channels:{memory-channel=org.apache.flume.channel.MemoryChannel{name: memory-channel}} }
...
2017-10-20 21:10:25,268 (pool-6-thread-1) [INFO - org.apache.flume.client.avro.ReliableSpoolingFileEventReader.readEvents(ReliableSpoolingFileEventReader.java:238)] Last read was never committed - resetting mark position.
向 /flume/weblogsmiddle 传入 log:
cp -r /mytest/weblogs /tmp/tmpweblogs
mv /tmp/tmpweblogs/* /flume/weblogsmiddle
等待几分钟后，查看 hdfs 上的变化:
$
$ hdfs dfs -ls /test001/weblogsflume
-rw-rw-rw- 1 training supergroup 527909 2017-10-20 21:10 /test001/weblogsflume/FlumeData.1508558917884 -rw-rw-rw- 1 training supergroup 527776 2017-10-20 21:10 /test001/weblogsflume/FlumeData.1508558917885 ... -rw-rw-rw- 1 training supergroup 527909 2017-10-20 21:10 /test001/weblogsflume/FlumeData.1508558917884 -rw-rw-rw- 1 training supergroup 527776 2017-10-20 21:10 /test001/weblogsflume/FlumeData.1508558917885 $
在flume-ng 启动的窗口，按下 Ctrl+C Ctrol+Z 停止 flume 的运行
^C
^Z
[1]+ Stopped
flume-ng agent --conf /etc/flume-ng/conf --conf-file spooldir.conf --name agent1 -Dflume.root.logger=INFO,console
[training@localhost flume]$