我在宇宙软件实验室实例上执行Hive时遇到了一些问题。
首先，在登录机器后，我进入Hive命令行，我收到以下错误（我看到了与此相关的其他问题，但我无法找到解决方案）：
$ hive
log4j:ERROR Could not instantiate class [org.apache.hadoop.hive.shims.HiveEventCounter].
java.lang.RuntimeException: Could not load shims in class org.apache.hadoop.log.metrics.EventCounter
at org.apache.hadoop.hive.shims.ShimLoader.createShim(ShimLoader.java:123)
at org.apache.hadoop.hive.shims.ShimLoader.loadShims(ShimLoader.java:115)
at org.apache.hadoop.hive.shims.ShimLoader.getEventCounter(ShimLoader.java:98)
at org.apache.hadoop.hive.shims.HiveEventCounter.<init>(HiveEventCounter.java:34)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:357)
at java.lang.Class.newInstance(Class.java:310)
at org.apache.log4j.helpers.OptionConverter.instantiateByClassName(OptionConverter.java:330)
at org.apache.log4j.helpers.OptionConverter.instantiateByKey(OptionConverter.java:121)
at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:664)
at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:647)
at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:544)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:440)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:476)
at org.apache.log4j.PropertyConfigurator.configure(PropertyConfigurator.java:354)
at org.apache.hadoop.hive.common.LogUtils.initHiveLog4jDefault(LogUtils.java:127)
at org.apache.hadoop.hive.common.LogUtils.initHiveLog4jCommon(LogUtils.java:77)
at org.apache.hadoop.hive.common.LogUtils.initHiveLog4j(LogUtils.java:58)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:641)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:625)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:197)
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.log.metrics.EventCounter
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:171)
at org.apache.hadoop.hive.shims.ShimLoader.createShim(ShimLoader.java:120)
... 27 more
log4j:ERROR Could not instantiate appender named "EventCounter".
Logging initialized using configuration in jar:file:/usr/local/apache-hive-0.13.0-bin/lib/hive-common-0.13.0.jar!/hive-log4j.properties
但是，我能够运行SELECT * FROM table;
之类的查询另一方面，如果我尝试运行其他查询更具体，例如仅显示列字段，则地图缩减作业开始运行并导致以下错误：
hive> SELECT table.column FROM table;
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_201507101501_40071, Tracking URL = http://cosmosmaster-gi:50030/jobdetails.jsp?jobid=job_201507101501_40071
Kill Command = /usr/lib/hadoop-0.20/bin/hadoop job -kill job_201507101501_40071
Hadoop job information for Stage-1: number of mappers: 1; number of reducers: 0
2016-01-29 12:49:45,518 Stage-1 map = 0%, reduce = 0%
2016-01-29 12:50:08,642 Stage-1 map = 100%, reduce = 100%
Ended Job = job_201507101501_40071 with errors
Error during job, obtaining debugging information...
Job Tracking URL: http://cosmosmaster-gi:50030/jobdetails.jsp?jobid=job_201507101501_40071
Examining task ID: task_201507101501_40071_m_000002 (and more) from job job_201507101501_40071
Task with the most failures(4):
-----
Task ID:
task_201507101501_40071_m_000000
URL:
http://cosmosmaster-gi:50030/taskdetails.jsp?jobid=job_201507101501_40071&tipid=task_201507101501_40071_m_000000
-----
Diagnostic Messages for this Task:
java.lang.RuntimeException: Error in configuring object
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:386)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:324)
at org.apache.hadoop.mapred.Child$4.run(Child.java:266)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1278)
at org.apache.hadoop.mapred.Child.main(Child.java:260)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.jav
FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask
MapReduce Jobs Launched:
Job 0: Map: 1 HDFS Read: 0 HDFS Write: 0 FAIL
Total MapReduce CPU Time Spent: 0 msec
欢迎任何帮助或建议。
感谢。
答案 0 :(得分：0)
第一个错误不相关，并且不会影响Hive查询，正如您所见。
关于第二个错误，很可能是因为HDFS中存储的数据是Json格式（很可能是由Cygnus工具存储的），并且必须设置Json SerializerDeserializer（serde）。您可以在执行select column from table之前执行以下句子来执行此操作：
$ add jar /usr/local/apache-hive-0.13.0-bin/lib/json-serde-1.3.1-SNAPSHOT-jar-with-dependencies.jar;
$ select column from table;