我喜欢通过mongodb连接(而不是通过bson转储)将emr集群连接到mongodb。
为此,我在aws管理控制台上生成了集群。在引导配置中,我指向了这个放在s3上的文件:
# !/bin/sh
wget -P /home/hadoop/lib http://central.maven.org/maven2/org/mongodb/mongo-java-driver/2.13.0/mongo-java-driver-2.13.0.jar
wget -P /home/hadoop/lib https://github.com/mongodb/mongo-hadoop/releases/download/r1.3.2/mongo-hadoop-core-1.3.2.jar
wget -P /home/hadoop/lib https://github.com/mongodb/mongo-hadoop/releases/download/r1.3.2/mongo-hadoop-pig-1.3.2.jar
wget -P /home/hadoop/lib https://github.com/mongodb/mongo-hadoop/releases/download/r1.3.2/mongo-hadoop-hive-1.3.2.jar
当集群生成时,我将其放入主集群,并看到它们已成功下载。
当我在Hive壳中执行此操作时:
CREATE TABLE nicks
(
id STRING,
name STRING,
business STRING,
alias STRING
)
STORED BY 'com.mongodb.hadoop.hive.MongoStorageHandler'
TBLPROPERTIES('mongo.uri'='mongodb://54.93.123.123:27017/foo.aliases');
ADD JAR /home/hadoop/lib/mongo-hadoop-core-1.3.2.jar;
ADD JAR /home/hadoop/lib/mongo-hadoop-hive-1.3.2.jar;
ADD JAR /home/hadoop/lib/mongo-java-driver-2.13.0.jar;
Select * from nicks;
我得到一个例外:
Exception in thread "main" java.lang.NoClassDefFoundError: com/mongodb/DBObject
at com.mongodb.hadoop.splitter.MongoSplitterFactory.getSplitterByClass(MongoSplitterFactory.java:41)
at com.mongodb.hadoop.splitter.MongoSplitterFactory.getSplitter(MongoSplitterFactory.java:109)
at com.mongodb.hadoop.hive.input.HiveMongoInputFormat.getSplits(HiveMongoInputFormat.java:64)
at com.mongodb.hadoop.hive.input.HiveMongoInputFormat.getSplits(HiveMongoInputFormat.java:44)
at org.apache.hadoop.hive.ql.exec.FetchOperator.getRecordReader(FetchOperator.java:418)
at org.apache.hadoop.hive.ql.exec.FetchOperator.getNextRow(FetchOperator.java:561)
at org.apache.hadoop.hive.ql.exec.FetchOperator.pushRow(FetchOperator.java:534)
at org.apache.hadoop.hive.ql.exec.FetchTask.fetch(FetchTask.java:137)
at org.apache.hadoop.hive.ql.Driver.getResults(Driver.java:1519)
at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:292)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:227)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:430)
at org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:803)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:697)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:636)
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.DBObject
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 java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 20 more
注:
我已经(使用ssh)将所有4个lib放在正确的文件夹中
MongoHiveConnectorJAR似乎已加载,因为在此之前我遇到了另一个异常,通过执行“addjar…”修复了该异常。
我检查了mongojava驱动程序jar的内容。它似乎是有效的(我在里面找到了dbobject类)
如何修复或如何调试错误?
1条答案
按热度按时间ibps3vxo1#
解决办法是把libs也放到
/home/hadoop/hive/lib
. 使用此脚本可以: