给我一个利用flume收集tomcat日志并将其保存到hive的教程

可以参考以下步骤：

1. 安装Flume和Hive

首先需要安装Flume和Hive，可以参考官方文档进行安装。

2. 配置Flume

在Flume的配置文件中，需要设置source、channel和sink。source用于收集Tomcat日志，channel用于缓存日志数据，sink用于将日志数据写入Hive。

以下是一个简单的Flume配置文件示例：

# Name the components on this agent
agent.sources = tomcat
agent.channels = memory
agent.sinks = hive

# Describe/configure the source
agent.sources.tomcat.type = exec
agent.sources.tomcat.command = tail -F /path/to/tomcat/logs/catalina.out

# Describe the memory channel
agent.channels.memory.type = memory

# Describe the Hive sink
agent.sinks.hive.type = hive
agent.sinks.hive.hive.metastore.uri = thrift://localhost:9083
agent.sinks.hive.hive.database = mydb
agent.sinks.hive.hive.table = mytable
agent.sinks.hive.serializer = org.apache.flume.sink.hive.RegexSerializer
agent.sinks.hive.serializer.regex = (\\S+) (\\S+) (\\S+) \\[(.*)\\] \"(\\S+) (\\S+) (\\S+)\" (\\S+) (\\S+)
agent.sinks.hive.serializer.names = timestamp, ip, user, datetime, method, url, protocol, status, size

# Bind the source and sink to the channel
agent.sources.tomcat.channels = memory
agent.sinks.hive.channel = memory

3. 启动Flume

启动Flume并指定配置文件：

$ bin/flume-ng agent -n agent -c conf -f /path/to/flume.conf

4. 创建Hive表

在Hive中创建表，用于存储Tomcat日志数据：

CREATE TABLE mytable (
  timestamp STRING,
  ip STRING,
  user STRING,
  datetime STRING,
  method STRING,
  url STRING,
  protocol STRING,
  status STRING,
  size STRING
)
ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.RegexSerDe'
WITH SERDEPROPERTIES (
  'input.regex'='(\\S+) (\\S+) (\\S+) \\[(.*)\\] \"(\\S+) (\\S+) (\\S+)\" (\\S+) (\\S+)',
  'output.format.string'='%1$s %2$s %3$s %4$s %5$s %6$s %7$s %8$s %9$s'
)
STORED AS TEXTFILE;

5. 查询Hive表

在Hive中查询表，查看Tomcat日志数据是否已经成功写入：

SELECT * FROM mytable;

以上就是利用Flume收集Tomcat日志并将其保存到Hive的教程。