Hive UDF 在选择中抛出未找到类异常
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【中文标题】Hive UDF 在选择中抛出未找到类异常【英文标题】：Hive UDF Throws Class Not Found Exception in select 【发布时间】：2017-08-06 13:36:44 【问题描述】：我一直在使用 UDF jar。我需要在我的 UDF 中解析简单的 UserAgent。我发现了一个流行的 UserAgent 解析器 http://www.bitwalker.eu/software/user-agent-utils，我将它包含在我的项目中。在项目中我使用 Maven。我添加了所有依赖项，实现了一切并对其进行了测试。它在我的本地机器上运行良好。接下来，我在 Maven 中进行全新安装以构建 jar。我通过添加 jar MyJarName 在 Hive 中使用这个 jar，然后创建一个函数：创建临时函数 functionName 作为 pathToUDFClass 并得到这样的异常。
Caused by: java.lang.RuntimeException: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row "bidid":"8326c0ec49e5746f1af03400f37e5797","tstamp":20131022185001163,"logtype":1
,"ipinyouid":"D89E8S5bwWz","useragent":"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; InfoPath.2)","ip":"61.138.253.*","regionid":374,"cityid":375,"adexchange":1
,"domain":"449a7568331085d43d5867de26ce1ee1","url":"5ecba5b62bafd3428cdc1398b40cf88f","anonymousurl":"null","adslotid":null,"adslotwidth":300,"adslotheight":250,"adslotvisibility":"Na","adslotformat":"Na","adslo
tfloorprice":0,"creativeid":"10722","biddingprice":294,"payingprice":135,"landingpageurl":"null","advertiserid":2821,"userprofileids":[10006,10110,10063]
at org.apache.hadoop.hive.ql.exec.tez.MapRecordSource.processRow(MapRecordSource.java:91)
at org.apache.hadoop.hive.ql.exec.tez.MapRecordSource.pushRecord(MapRecordSource.java:68)
at org.apache.hadoop.hive.ql.exec.tez.MapRecordProcessor.run(MapRecordProcessor.java:325)
at org.apache.hadoop.hive.ql.exec.tez.TezProcessor.initializeAndRunProcessor(TezProcessor.java:150)
... 14 more
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row "bidid":"8326c0ec49e5746f1af03400f37e5797","tstamp":20131022185001163,"logtype":1,"ipinyouid":"D89E8S5bwWz","
useragent":"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; InfoPath.2)","ip":"61.138.253.*","regionid":374,"cityid":375,"adexchange":1,"domain":"449a7568331085d43
d5867de26ce1ee1","url":"5ecba5b62bafd3428cdc1398b40cf88f","anonymousurl":"null","adslotid":null,"adslotwidth":300,"adslotheight":250,"adslotvisibility":"Na","adslotformat":"Na","adslotfloorprice":0,"creativeid":
"10722","biddingprice":294,"payingprice":135,"landingpageurl":"null","advertiserid":2821,"userprofileids":[10006,10110,10063]
at org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:565)
at org.apache.hadoop.hive.ql.exec.tez.MapRecordSource.processRow(MapRecordSource.java:83)
... 17 more
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Unable to execute method public org.apache.hadoop.io.Text hive.homework3.UserAgentDetector.evaluate(org.apache.hadoop.io.Text) on object hive.homewor
k3.UserAgentDetector@1b340ab of class hive.homework3.UserAgentDetector with arguments Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; InfoPath.2):org.apache.hadoo
p.io.Text of size 1
at org.apache.hadoop.hive.ql.exec.FunctionRegistry.invoke(FunctionRegistry.java:1019)
at org.apache.hadoop.hive.ql.udf.generic.GenericUDFBridge.evaluate(GenericUDFBridge.java:182)
at org.apache.hadoop.hive.ql.exec.ExprNodeGenericFuncEvaluator._evaluate(ExprNodeGenericFuncEvaluator.java:186)
at org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator.evaluate(ExprNodeEvaluator.java:77)
at org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator.evaluate(ExprNodeEvaluator.java:65)
at org.apache.hadoop.hive.ql.exec.SelectOperator.process(SelectOperator.java:81)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:841)
at org.apache.hadoop.hive.ql.exec.TableScanOperator.process(TableScanOperator.java:133)
at org.apache.hadoop.hive.ql.exec.MapOperator$MapOpCtx.forward(MapOperator.java:170)
at org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:555)
... 18 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.hive.ql.exec.FunctionRegistry.invoke(FunctionRegistry.java:995)
... 27 more
Caused by: java.lang.NoClassDefFoundError: eu/bitwalker/useragentutils/UserAgent
at hive.homework3.UserAgentDetector.formatter(UserAgentDetector.java:30)
at hive.homework3.UserAgentDetector.evaluate(UserAgentDetector.java:22)
... 32 more
Caused by: java.lang.ClassNotFoundException: eu.bitwalker.useragentutils.UserAgent
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 34 more
]], Vertex did not succeed due to OWN_TASK_FAILURE, failedTasks:1 killedTasks:21, Vertex vertex_1501829365845_0009_1_00 [Map 1] killed/failed due to:OWN_TASK_FAILURE]DAG did not succeed due to VERTEX_FAILURE. fa
iledVertices:1 killedVertices:0
据我了解，最重要的是：
Caused by: java.lang.ClassNotFoundException: eu.bitwalker.useragentutils.UserAgent
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 34 more
我在我的 maven 项目中使用的这个外部库。
这是 UDF 创建，顺便说一下，在本地工作中一切正常，测试通过。但在 Hive 中它不起作用。我想我使用的这个库有问题，但如果我在本地工作正常，有可能吗？
import eu.bitwalker.useragentutils.UserAgent;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.io.Text;
@Description(
name = "agentdetector",
value = "_FUNC_(str) - detects a user-agent of user",
extended = "Example:\n" +
" > SELECT agent(line) FROM test ipy; \n"
)
public class UserAgentDetector extends UDF
public Text evaluate(Text text)
Text value = new Text("");
if (text != null)
value.set(formatter(text));
return value;
else
return null;
private Text formatter(Text text)
UserAgent userAgent = UserAgent.parseUserAgentString(text.toString());
StringBuilder builder = new StringBuilder();
builder.append("Browser : ").append(userAgent.getBrowser().getName()).append("\n");
text.set(builder.toString());
return text;
而对maven的依赖是：
<dependency>
<groupId>eu.bitwalker</groupId>
<artifactId>UserAgentUtils</artifactId>
<version>1.20</version>
</dependency>
【问题讨论】：
【参考方案1】：要解决这个问题，只需在 pom.xml 中添加插件
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>pathToMainClass</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
并在 maven 的插件中运行 assembly:assembly。
【讨论】：
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