我正在尝试在Amazon EMR集群（AMI版本3.2.0/Hadoop版本2.4.0）上安装sqoop 2（版本1.99.3）。当我启动sqoop服务器时，我在localhost.log中看到此错误：
Sep 10, 2014 4:55:56 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class org.apache.sqoop.server.ServerInitializer
java.lang.RuntimeException: Failure in server initialization
at org.apache.sqoop.core.SqoopServer.initialize(SqoopServer.java:57)
at org.apache.sqoop.server.ServerInitializer.contextInitialized(ServerInitializer.java:36)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4206)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:943)
at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:778)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:504)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
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.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: org.apache.sqoop.common.SqoopException: MAPREDUCE_0002:Failure on submission engine initialization
at org.apache.sqoop.submission.mapreduce.MapreduceSubmissionEngine.initialize(MapreduceSubmissionEngine.java:115)
at org.apache.sqoop.framework.JobManager.initialize(JobManager.java:215)
at org.apache.sqoop.core.SqoopServer.initialize(SqoopServer.java:53)
... 25 more
Caused by: java.io.IOException: Cannot initialize Cluster. Please check your configuration for mapreduce.framework.name and the correspond server addresses.
at org.apache.hadoop.mapreduce.Cluster.initialize(Cluster.java:120)
at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:82)
at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:75)
at org.apache.hadoop.mapred.JobClient.init(JobClient.java:470)
at org.apache.hadoop.mapred.JobClient.<init>(JobClient.java:449)
at org.apache.sqoop.submission.mapreduce.MapreduceSubmissionEngine.initialize(MapreduceSubmissionEngine.java:113)
... 27 more
以下是我按照安装说明所做的操作。请注意，对于EMR，$HADOOP_HOME是/HOME/HADOOP。
- 我从Apache下载了sqoop-1.99.3-bin-hadoop200.tar.gz，并将其提取到$HADOOP_HOME/scoop中
- 将以下内容添加到catalina.properties中的common.loader属性：/home/hadop/share/hadop/common/*.jar、/home/hadop/share/hadoop/common/lib/*.jar、/home/hadop/hare/hadop/mapreduce/*.jar和/home/haop/share/haop/yarn/*.jar
- 在平方米属性中：
- 我用/home/hadop/sqoop/log替换了@LOGDIR@
- 我用/home/hadop/sqoop替换了@BASEDIR@
- 对于属性org.apache.scoop.submission.engine.mapreduce.configuration.directory，我将/etc/hadoop/conf/替换为/home/hadoop/conf/
- 然后我启动了服务器：bin/scoop.sh server start
据我从错误中所知，问题的根源是这条线：
Caused by: java.io.IOException: Cannot initialize Cluster. Please check your configuration for mapreduce.framework.name and the correspond server addresses.
并且该属性在mapred-site.xml中设置：
<property><name>mapreduce.framework.name</name><value>yarn</value></property>
这就是我想要的。
我觉得我在sqoop的安装/配置中缺少了一些参数设置，我尝试了其他一些事情（比如尝试AMI 3.0.4/Hoop 2.2.0），但无法启动sqoop服务器。
fyi。我在Kyle Mulka的博客上读过这篇文章，但它引用了Hadoop和sqoop的不同版本，似乎没有深入了解我的配置。我已经阅读了这个网站上的其他一些页面，但还没有找到一个引用我正在使用的Hadoop和sqoop版本的页面。我已经看到这种配置在Cloudera中运行（sqoop2和Hadoop2 with yarn），但我还不知道如何将其转化为EMR安装。
感谢对这篇文章的反馈，我更改了catalina.properties中的common.loader属性，而不是以前的属性：
common.loader=${catalina.base}/lib,${catalina.base}/lib/*.jar,${catalina.home}/lib,${catalina.home}/lib/*.jar,${catalina.home}/../lib/*.jar,/home/hadoop/share/hadoop/common/*.jar,/home/hadoop/share/hadoop/common/lib/*.jar,/home/hadoop/share/hadoop/mapreduce/*.jar,/home/hadoop/share/hadoop/yarn/*.jar
到此：
common.loader=${catalina.base}/lib,${catalina.base}/lib/*.jar,${catalina.home}/lib,${catalina.home}/lib/*.jar,${catalina.home}/../lib/*.jar,/home/hadoop/share/hadoop/common/*.jar,/home/hadoop/share/hadoop/common/lib/*.jar,/home/hadoop/share/hadoop/hdfs/*.jar,/home/hadoop/share/hadoop/hdfs/lib/*.jar,/home/hadoop/share/hadoop/mapreduce/*.jar,/home/hadoop/share/hadoop/mapreduce/lib/*.jar,/home/hadoop/share/hadoop/tools/lib/*.jar,/home/hadoop/share/hadoop/yarn/*.jar,/home/hadoop/share/hadoop/yarn/lib/*.jar
之后，sqoop服务器成功启动。