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Cloudera, BigData, Semantic IoT, Hadoop, NoSQL

Cloudera CDH/CDP 및 Hadoop EcoSystem, Semantic IoT등의 개발/운영 기술을 정리합니다. gooper@gooper.com로 문의 주세요.


* rdf4j-http-workbench모듈은 java servlet을 이용하여 구현했고, rdf4j-http-server는 spring기반으로 구현되어 있음


1. rdf4j-http-workbench : rdf4j-workbench.war를 이용하여 web에서 작업할때 사용되는 모듈(프로젝트)

  가. /rdf4j-http-workbench/src/main/webapp/WEB-INF/web.xml에서 workbench의 RESTFul API와 매핑되는 class파일을 지정함


*rdf4j-workbench.war의 API에서 사용되는 URL매핑(web.xml파일)

<?xml version="1.0" encoding="UTF-8"?>
<web-app>

	<display-name>RDF4J Workbench</display-name>
	<description>RDF4J Workbench</description>

	<filter>
		<filter-name>redirect</filter-name>
		<filter-class>
			org.eclipse.rdf4j.workbench.proxy.RedirectFilter
		</filter-class>
		<init-param>
			<param-name>/</param-name>
			<param-value>/repositories</param-value>
		</init-param>
	</filter>

	<filter>
		<filter-name>cache</filter-name>
		<filter-class>
			org.eclipse.rdf4j.workbench.proxy.CookieCacheControlFilter
		</filter-class>
	</filter>

	<filter>
		<filter-name>CacheFilter</filter-name>
		<filter-class>org.eclipse.rdf4j.workbench.proxy.CacheFilter</filter-class>
		<init-param>
			<param-name>Cache-Control</param-name>
			<param-value>600</param-value>
		</init-param>
	</filter>

	<filter-mapping>
		<filter-name>redirect</filter-name>
		<url-pattern>/</url-pattern>
	</filter-mapping>

	<filter-mapping>
		<filter-name>cache</filter-name>
		<url-pattern>/repositories/*</url-pattern>
	</filter-mapping>

	<filter-mapping>
		<filter-name>CacheFilter</filter-name>
		<url-pattern>*</url-pattern>
	</filter-mapping>

	<servlet>
		<servlet-name>workbench</servlet-name>
		<servlet-class>
			org.eclipse.rdf4j.workbench.proxy.WorkbenchGateway
		</servlet-class>
		<init-param>
			<param-name>transformations</param-name>
			<param-value>/transformations</param-value>
		</init-param>
		<init-param>
			<param-name>default-server</param-name>
			<param-value>/rdf4j-server</param-value>
		</init-param>
		<init-param>
			<param-name>accepted-server-prefixes</param-name>
			<param-value>file: http: https:</param-value>
		</init-param>
		<init-param>
			<param-name>change-server-path</param-name>
			<param-value>/NONE/server</param-value>
		</init-param>
		<init-param>
			<param-name>cookie-max-age</param-name>
			<param-value>2592000</param-value>
		</init-param>
		<init-param>
			<param-name>no-repository-id</param-name>
			<param-value>NONE</param-value>
		</init-param>
		<init-param>
			<param-name>default-path</param-name>
			<param-value>/NONE/repositories</param-value>
		</init-param>
		<init-param>
			<param-name>default-command</param-name>
			<param-value>/summary</param-value>
		</init-param>
		<init-param>
			<param-name>default-limit</param-name>
			<param-value>100</param-value>
		</init-param>
		<init-param>
			<param-name>default-queryLn</param-name>
			<param-value>SPARQL</param-value>
		</init-param>
		<init-param>
			<param-name>default-infer</param-name>
			<param-value>true</param-value>
		</init-param>
		<init-param>
			<param-name>default-Accept</param-name>
			<param-value>application/rdf+xml</param-value>
		</init-param>
		<init-param>
			<param-name>default-Content-Type</param-name>
			<param-value>application/rdf+xml</param-value>
		</init-param>
		<init-param>
			<param-name>/summary</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.SummaryServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/info</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.InfoServlet</param-value>
		</init-param>
		<init-param>
			<param-name>/information</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.InformationServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/repositories</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.RepositoriesServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/create</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.CreateServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/delete</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.DeleteServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/namespaces</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.NamespacesServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/contexts</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.ContextsServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/types</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.TypesServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/explore</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.ExploreServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/query</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.QueryServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/saved-queries</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.SavedQueriesServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/export</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.ExportServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/add</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.AddServlet</param-value>
		</init-param>
		<init-param>
			<param-name>/remove</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.RemoveServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/clear</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.ClearServlet
			</param-value>
		</init-param>
		<init-param>
			<param-name>/update</param-name>
			<param-value>org.eclipse.rdf4j.workbench.commands.UpdateServlet
			</param-value>
		</init-param>
	</servlet>

	<servlet-mapping>
		<servlet-name>workbench</servlet-name>
		<url-pattern>/repositories/*</url-pattern>
	</servlet-mapping>

</web-app>


  나. rdf4j-http-workbench.war에서 사용하는 class파일(예,StatementsController.java)은 "/rdf4j-http-server-spring/src/main/java/org/eclipse/rdf4j/http/server/repository/statements/StatementsController.java"등에 위치함


2. rdf4j-http-server : rdf4j-server.war를 이용하여 RESTFul API를 호출할때 사용되는 모듈(프로젝트)

  가. /rdf4j-http-server/src/main/webapp/WEB-INF/web.xml에서 아래와 같이 설정xml파일을 지정함

<servlet>
	    <servlet-name>rdf4j-http-server</servlet-name>
    	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
	    <init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>/WEB-INF/common-webapp-servlet.xml, /WEB-INF/common-webapp-system-servlet.xml, /WEB-INF/rdf4j-http-server-servlet.xml</param-value>
		</init-param>
	    <load-on-startup>100</load-on-startup>
	</servlet>

  나. /rdf4j-http-server/src/main/webapp/WEB-INF/rdf4j-http-server-servlet.xml에서 API와 매핑되는 class파일을 지정함


*rdf4j-server.war의 repository관련 API에서 사용되는 URL매핑

<bean id="rdf4jRepositoryUrlMapping"
		class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
		<property name="order" value="2" />
		<property name="alwaysUseFullPath" value="true" />
		<property name="mappings">
			<props>
				<prop key="/repositories/*/namespaces/*">rdf4jRepositoryNamespaceController</prop>
				<prop key="/repositories/*/namespaces">rdf4jRepositoryNamespacesController</prop>
				<prop key="/repositories/*/contexts">rdf4jRepositoryContextsController</prop>
				<prop key="/repositories/*/statements">rdf4jRepositoryStatementsController</prop>
				<prop key="/repositories/*/rdf-graphs">rdf4jRepositoryContextsController</prop>
				<prop key="/repositories/*/rdf-graphs/*">rdf4jRepositoryGraphController</prop>
				<prop key="/repositories/*/size">rdf4jRepositorySizeController</prop>
				<prop key="/repositories/*/transactions">rdf4jRepositoryTransactionStartController</prop>
				<prop key="/repositories/*/transactions/*">rdf4jRepositoryTransactionController</prop>
				<prop key="/repositories/*">rdf4jRepositoryController</prop>
			</props>
		</property>
		<property name="interceptors">
			<list>
				<ref bean="rdf4jRepositoryInterceptor" />
			</list>
		</property>
	</bean>


*URL매핑에 해당되는 처리 class매핑

<!-- CONTROLLERS -->
	<bean id="rdf4jProtocolController" class="org.eclipse.rdf4j.http.server.protocol.ProtocolController" />

	<bean id="rdf4jRepositoryListController"
		class="org.eclipse.rdf4j.http.server.repository.RepositoryListController">
		<property name="repositoryManager" ref="rdf4jRepositoryManager" />
	</bean>
	<bean id="rdf4jRepositoryController" class="org.eclipse.rdf4j.http.server.repository.RepositoryController">
		<property name="repositoryManager" ref="rdf4jRepositoryManager" />
	</bean>
	<bean id="rdf4jRepositoryContextsController"
		class="org.eclipse.rdf4j.http.server.repository.contexts.ContextsController" />
	<bean id="rdf4jRepositoryNamespacesController"
		class="org.eclipse.rdf4j.http.server.repository.namespaces.NamespacesController" />
	<bean id="rdf4jRepositoryNamespaceController"
		class="org.eclipse.rdf4j.http.server.repository.namespaces.NamespaceController" />
	<bean id="rdf4jRepositorySizeController" class="org.eclipse.rdf4j.http.server.repository.size.SizeController" />
	<bean id="rdf4jRepositoryStatementsController"
		class="org.eclipse.rdf4j.http.server.repository.statements.StatementsController" />
	<bean id="rdf4jRepositoryGraphController"
		class="org.eclipse.rdf4j.http.server.repository.graph.GraphController" />
	<bean id="rdf4jRepositoryTransactionController"
		class="org.eclipse.rdf4j.http.server.repository.transaction.TransactionController" />
	<bean id="rdf4jRepositoryTransactionStartController"
		class="org.eclipse.rdf4j.http.server.repository.transaction.TransactionStartController" />

다 rdf4j-server.war가 사용하는 class파일은(예, StatementsController.java) "/rdf4j-http-server-spring/src/main/java/org/eclipse/rdf4j/http/server/repository/statements/StatementsController.java"에 위치함

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219 CDH 5.14.2 설치중 agent설치에서 실패하는 경우 확인/조치 2018.05.22 593
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217 oozie db변경후 재기동시 "Table 'oozie.VALIDATE_CONN' doesn't exist" 오류 발생시 조치방법 2018.05.23 444
216 "You are running Cloudera Manager in non-production mode.." warning메세지가 나타나지 않게 조치하는 방법 2018.05.23 442
215 Cloudera Manager재설치하는 동안 "Host is in bad health"오류가 발생하는 경우 확인/조치 사항 2018.05.24 427
214 우분투 서버에 GUI로 접속하기 file 2018.05.27 518
213 Cloudera Manager설치및 Uninstall 방법(순서) 2018.05.28 1730
212 DataNode를 기동할때 "Block pool ID needed, but service not yet registered with NN" 오류 발생에 따른 조치사항 2018.05.28 1147
211 JobHistory 서버 기동시 HDFS상에 특정 폴더를 생성할 수 없어서 기동하지 못하는 경우 조치 2018.05.29 2967
210 HUE를 사용할 사용자를 추가 하는 절차 2018.05.29 420
209 MapReduce2.0(YARN)기반의 CDH5 설치시 생성되는 사용자및 권한 부여 2018.05.30 422
208 impala2를 Cloudera Manager가 아닌 수동으로 설치하는 방법 2018.05.30 468
207 spark 시동중 applicationHistory 로그 디렉토리가 없다고 하면서 기동되지 않는 경우 2018.06.01 441
206 JAVA_HOME을 명시적으로 지정하는 방법 2018.06.04 329
205 Cloudera Manager에서 "Mismatched CDH versions: host has NONE but role expects 5 Suppress..."와 같이 오류 발생시 확인사항 2018.06.06 444
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202 dr.who로 공격들어오는 경우 조치방법 file 2018.06.09 5713
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