我正试图使用wiki网站上提供的驱动程序(jar)从Hive数据库连接到MongoDB中的集合。以下是我所做的步骤:-
我在MongoDB中的一个名为"Diamond"的数据库下创建了一个集合,它有20个文档:
我想通过Hadoop MongoDB驱动程序从Hive连接,并通过Hive查看这些文档。
我在同一台服务器上安装并配置了MongoDB和Hive。然而,我没有看到任何名为HIVE_CLASPATH的变量,我想知道它在哪里
So I installed 3 divers on the server: -
mongo-hadoop-core-1.5.2.jar;
mongo-hadoop-hive-1.5.2.jar;
mongo-java-driver-3.0.0.jar;
现在,我连接到Hive,然后通过以下命令将这2个jar添加到我的类路径中:-(它们成功添加)
add jar /hadoopgdc/hadoop-2.6.0/share/hadoop/common/lib/mongo-hadoop-hive-1.5.2.jar;
add jar /hadoopgdc/hadoop-2.6.0/share/hadoop/common/lib/mongo-hadoop-core-1.5.2.jar;
add jar /hadoopgdc/hadoop-2.6.0/share/hadoop/common/lib/mongo-java-driver-3.0.0.jar;
现在我在HIVE中创建一个表:-
CREATE TABLE Diamond
(
carat DOUBLE,
cut STRING,
color STRING,
clarity STRING,
depth DOUBLE,
table DOUBLE,
price DOUBLE,
xcord DOUBLE,
ycord DOUBLE,
zcord DOUBLE
)
STORED BY 'com.mongodb.hadoop.hive.MongoStorageHandler'
WITH SERDEPROPERTIES('mongo.columns.mapping'='{"carat":"carat","cut":"cut",
"color":"color", "clarity":"clarity", "depth":"depth", "table":"table",
"price":"price", "xcord":"x", "ycord":"y", "zcord":"z"}')
TBLPROPERTIES('mongo.uri'='mongodb://localhost:27017/Moe.Diamond');
However when I execute the above command in Hive I get the error below: -
java.lang.NoClassDefFoundError: com/mongodb/util/JSON
at com.mongodb.hadoop.hive.BSONSerDe.initialize(BSONSerDe.java:110)
at org.apache.hadoop.hive.metastore.MetaStoreUtils.getDeserializer(MetaStoreUtils.java:210)
at org.apache.hadoop.hive.ql.metadata.Table.getDeserializerFromMetaStore(Table.java:268)
at org.apache.hadoop.hive.ql.metadata.Table.getDeserializer(Table.java:261)
at org.apache.hadoop.hive.ql.metadata.Table.getCols(Table.java:587)
at org.apache.hadoop.hive.ql.metadata.Hive.createTable(Hive.java:573)
at org.apache.hadoop.hive.ql.exec.DDLTask.createTable(DDLTask.java:3784)
at org.apache.hadoop.hive.ql.exec.DDLTask.execute(DDLTask.java:256)
at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:155)
at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:57)
at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1355)
at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1139)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:945)
at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:259)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:216)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:413)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:756)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:614)
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.RunJar.main(RunJar.java:212)
Caused by: java.lang.ClassNotFoundException: com.mongodb.util.JSON
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 23 more
FAILED: Execution Error, return code -101 from
org.apache.hadoop.hive.ql.exec.DDLTask
我尝试了以下操作:--将jar放置在所有可能的目录中,但没有任何效果-应该缺失的类几乎存在于jar文件中。-哦,是的,MongoStorageHandler类就在jar中。
我受够了!!如果有人能告诉我可以做些什么来缓解我的焦虑,那就太好了。
再次感谢。马里奥
我确定了问题所在。为了从HIVE连接到MongoDB,MongoDB驱动程序使用调用HIVE-jar库中的java类**
java.lang.ClassNotFoundException:org.apache.hadoop.hive.ql.hooks.PreExecutePrinter
**现在,这个类应该在jar文件-hive-execut-0.111.0.1.3.20-111.jar中找到。但是,它只在hive的最新版本中可用,而不是旧版本。
它在0.11.0.1.3.2.0-111中不可用,但在0.13.0..2.1.7.0-784中可明显检测到。
这里的解决方案是连接到驱动程序支持的HIVE版本。MongoDB确实声明其驱动程序支持特定版本的Hadoop,但没有深入到单个应用程序(HIVE/SQOOP)。