Hive ClassNotFoundException: org.apache.hadoop.hive.contrib.serde2.RegexSerDe

在Hive的测试中，发现使用正则表达式的字段分隔方式时，总是进行不下去，创建表的语句如下：

create table mylog2(time string,clause string) row format serde 'org.apache.hadoop.hive.contrib.serde2.RegexSerDe' with serdeproperties ("input.regex" = "(\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2},\\d{3}) - (.*) -(.*)");

通过查看Tracking URL，发现抛出类找不到的异常，类

org.apache.hadoop.hive.contrib.serde2.RegexSerDe

没有找到。

解决方法：

将下面的配置语句，加在配置文件： $HIVE_INSTALL/conf/hive-site.xml中，value中hive-contrib-*.jar的路径为你机器上实际的放置，在$HIVE_INSTALL/lib目录下寻找。

<property>
  <name>hive.aux.jars.path</name>
  <value>file:///home/develop/hive-0.8.0/lib/hive-contrib-0.8.0.jar</value>
  <description>Added by tiger.zeng on 20120202.These JAR file are available to all users for all jobs</description>
</property>

退出hive shell, 重新启动hive shell, 可运行正常。

运行结果如下：

hive> select time,clause from mylog2;
Total MapReduce 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_201202021642_0003, Tracking URL = http://hdp0:50030/jobdetails.jsp?jobid=job_201202021642_0003
Kill Command = /home/hadoop/hadoop-0.20.203.0/bin/hadoop job  -Dmapred.job.tracker=hdp0:9001 -kill job_201202021642_0003
Hadoop job information for Stage-1: number of mappers: 1; number of reducers: 0
2012-02-02 16:58:43,327 Stage-1 map = 0%,  reduce = 0%
2012-02-02 16:58:49,375 Stage-1 map = 100%,  reduce = 0%
2012-02-02 16:58:55,437 Stage-1 map = 100%,  reduce = 100%
Ended Job = job_201202021642_0003
MapReduce Jobs Launched:
Job 0: Map: 1   HDFS Read: 1286 HDFS Write: 564 SUCESS
Total MapReduce CPU Time Spent: 0 msec
OK
NULL    NULL
NULL    NULL
NULL    NULL
NULL    NULL
2012-01-17 00:14:19,301    org.apache.hadoop.conf.Configuration -0    [main] DEBUG org.apache.hadoop.conf.Configuration
NULL    NULL
NULL    NULL
NULL    NULL
NULL    NULL
NULL    NULL
2012-01-17 00:14:19,314    org.apache.hadoop.util.NativeCodeLoader -13   [main] DEBUG org.apache.hadoop.util.NativeCodeLoader
2012-01-17 00:14:19,314    org.apache.hadoop.util.NativeCodeLoader -13   [main] INFO  org.apache.hadoop.util.NativeCodeLoader
2012-01-17 00:14:19,316    org.apache.hadoop.io.compress.zlib.ZlibFactory -15   [main] INFO  org.apache.hadoop.io.compress.zlib.ZlibFactory
NULL    NULL
Time taken: 21.28 seconds
hive>

参考：

Jasper Knulst 13020438802011年04月06日 星期三 06时51分20秒

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Hi(ve),I created a table like this;create table testtable (veld1 STRING,veld2 STRING,veld3 STRING) ROW FORMATSERDE 'org.apache.hadoop.hive.contrib.serde2.RegexSerDe'> WITH SERDEPROPERTIES ("input.regex" ="([a-z]{4}[0-9])þ([a-z]{4}[0-9])þ([a-z]{4}[0-9])") STORED AS TEXTFILE;The table is OK, select * from testtable shows the contents of theunderlying HDFS file.However when I invoke a MR job by select veld2 from testtable, the MR jobstarts but I get mapper errors saying:"Caused by: org.apache.hadoop.hive.ql.metadata.HiveException:java.lang.ClassNotFoundException:org.apache.hadoop.hive.contrib.serde2.RegexSerDe"I already copied the hive serde jar (in my case hive-serde-0.7.0-CDH3B4.jar)to $HADOOP_HOME/lib and restarted jobtracker/tasktrackers but that doesn'thelp.Cheers JasperShow footer-- Kind Regards \ Met Vriendelijke Groet,Jasper KnulstBI ConsultantVLC Den HaagGildeweg 5B2632 BD  NootdorpM: [phone]T: [phone]

Loren Siebert 13020443192011年04月06日 星期三 06时58分39秒

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You need to tell Hive about the JAR. This is how I do it in hive-site.xml:<property>  <name>hive.aux.jars.path</name>  <value>file:///usr/lib/hive/lib/hive-contrib-0.7.0-CDH3B4.jar</value>  <description>These JAR file are available to all users for all jobs</description></property>Show quoted text