Hive 使用RegexSerDe来处理标准格式Apache Web日志
我们以一个例子来介绍如何使用RegexSerDe来处理标准格式的Apache Web日志，并对其进行统计分析。我的Hive版本是apache-hive-0.13.1-bin
一、在Hive中创建表serde_regex
CREATE TABLE serde_regex(
host STRING,
identity STRING ,
user STRING,
time STRING,
request STRING,
status STRING,
size STRING,
referer STRING,
agent STRING )
ROW FORMAT SERDE 'org.apache.hadoop.hive.contrib.serde2.RegexSerDe'
WITH SERDEPROPERTIES (
"input.regex" = "([\\d|.]+)\\s+([^ ]+)\\s+([^ ]+)\\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 ;
二、往表中导入数据
Apache Web 日志内容格式见附件下载链接（可下载）
往表中导入事例数据
hive> LOAD DATA LOCAL INPATH "./data/apache_log.txt" INTO TABLE serde_regex;
三、查询分析
查询分析的时候报了以下错误：主要就是缺少RegexSerDe处理类，也就是说，hive会话环境中缺少该类所在的包。
hive> select host,request,agent from serde_regex limit 10;
Total jobs = 1
Launching Job 1 out of 1
Number of reduce tasks is set to 0 since there's no reduce operator
Starting Job = job_1419317102229_0001, Tracking URL = http://secondmgt:8088/proxy/application_1419317102229_0001/
Kill Command = /home/hadoopUser/cloud/hadoop/programs/hadoop-2.2.0/bin/hadoop job -kill job_1419317102229_0001
Hadoop job information for Stage-1: number of mappers: 1; number of reducers: 0
2014-12-23 14:46:15,389 Stage-1 map = 0%, reduce = 0%
2014-12-23 14:47:02,249 Stage-1 map = 100%, reduce = 0%
Ended Job = job_1419317102229_0001 with errors
Error during job, obtaining debugging information...
Job Tracking URL: http://secondmgt:8088/proxy/application_1419317102229_0001/
Examining task ID: task_1419317102229_0001_m_000000 (and more) from job job_1419317102229_0001
Task with the most failures(4):
-----
Task ID:
task_1419317102229_0001_m_000000
URL:
http://secondmgt:8088/taskdetails.jsp?jobid=job_1419317102229_0001&tipid=task_1419317102229_0001_m_000000
-----
Diagnostic Messages for this Task:
Error: java.lang.RuntimeException: Error in configuring object
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:109)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:75)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:425)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:162)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:157)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:106)
... 9 more
Caused by: java.lang.RuntimeException: Error in configuring object
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:109)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:75)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133)
at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:38)
... 14 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:106)
... 17 more
Caused by: java.lang.RuntimeException: Map operator initialization failed
at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.configure(ExecMapper.java:154)
... 22 more
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: java.lang.ClassNotFoundException: Class org.apache.hadoop.hive.contrib.serde2.RegexSerDe not found
at org.apache.hadoop.hive.ql.exec.MapOperator.getConvertedOI(MapOperator.java:335)
at org.apache.hadoop.hive.ql.exec.MapOperator.setChildren(MapOperator.java:353)
at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.configure(ExecMapper.java:123)
... 22 more
Caused by: java.lang.ClassNotFoundException: <span style="color:#ff0000;">Class org.apache.hadoop.hive.contrib.serde2.RegexSerDe not found</span>
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1626)
at org.apache.hadoop.hive.ql.exec.MapOperator.getConvertedOI(MapOperator.java:305)
... 24 more
四、异常解决办法
往hive会话中加入 hive-contrib-0.13.1.jar，该包位置在hive安装环境的lib目录下，加入命令如下：
hive> add jar /home/hadoopUser/cloud/hive/apache-hive-0.13.1-bin/lib/hive-contrib-0.13.1.jar; Added /home/hadoopUser/cloud/hive/apache-hive-0.13.1-bin/lib/hive-contrib-0.13.1.jar to class path Added resource: /home/hadoopUser/cloud/hive/apache-hive-0.13.1-bin/lib/hive-contrib-0.13.1.jar
再次执行第三步的SELECT查询命令，结果如下：
hive> select host,request,agent from serde_regex limit 10; Total jobs = 1 Launching Job 1 out of 1 Number of reduce tasks is set to 0 since there's no reduce operator Starting Job = job_1419317102229_0002, Tracking URL = http://secondmgt:8088/proxy/application_1419317102229_0002/ Kill Command = /home/hadoopUser/cloud/hadoop/programs/hadoop-2.2.0/bin/hadoop job -kill job_1419317102229_0002 Hadoop job information for Stage-1: number of mappers: 1; number of reducers: 0 2014-12-23 14:48:50,163 Stage-1 map = 0%, reduce = 0% 2014-12-23 14:49:01,666 Stage-1 map = 100%, reduce = 0%, Cumulative CPU 3.31 sec MapReduce Total cumulative CPU time: 3 seconds 310 msec Ended Job = job_1419317102229_0002 MapReduce Jobs Launched: Job 0: Map: 1 Cumulative CPU: 3.31 sec HDFS Read: 4321 HDFS Write: 238 SUCCESS Total MapReduce CPU Time Spent: 3 seconds 310 msec OK 61.160.224.138 GET 7519 61.160.224.138 GET 709 61.160.224.138 GET 815 113.17.174.44 POST 653 61.160.224.138 GET 1670 61.160.224.144 GET 2887 61.160.224.143 GET 2947 61.160.224.145 GET 2581 61.160.224.145 GET 2909 61.160.224.144 GET 15879 Time taken: 26.811 seconds, Fetched: 10 row(s)
问题解决，但是该解决方法只能对本次Hive会话有用，Hive使用命令exit退出后再进入依旧会出现该问题。
遗留问题：个人觉得应该有一种办法，将该包加入到hadoop/lib下，重启集群，可以长久解决该问题。但是没尝试过，待验证。
附件：
Apache日志.txt