Java实现搜狗实验:基于Hadoop平台的解决方案

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资源摘要信息:"hadoop实现的搜狗实验用java实现的" 知识点: 1. Hadoop简介: Hadoop是一个由Apache基金会开发的开源框架,它允许使用简单的编程模型跨计算机集群分布式处理大数据。Hadoop的两个核心组件是HDFS(Hadoop Distributed File System)和MapReduce。HDFS用于在集群上存储大量数据,而MapReduce用于处理这些数据。由于其高效、可靠、易于扩展的特点,Hadoop被广泛应用于大规模数据分析领域。 2. MapReduce编程模型: MapReduce是一种编程模型,用于处理和生成大数据集的并行算法。它将计算过程分为两个阶段:Map(映射)阶段和Reduce(归约)阶段。在Map阶段,系统会对输入数据集中的每个元素执行用户定义的Map函数,并将中间结果输出为键值对。在Reduce阶段,系统将具有相同键的中间结果组合起来,并对这些值执行用户定义的Reduce函数。 3. Java在Hadoop中的应用: Hadoop支持多种语言编写的MapReduce程序,其中Java是原生支持的语言之一。使用Java编写Hadoop程序的主要步骤包括设置开发环境,编写Map和Reduce函数,配置作业的输入输出路径以及提交作业到Hadoop集群运行。Java编写Hadoop程序的好处在于可以利用Java丰富的库和生态系统的稳定性。 4. 搜狗实验: 由于文档信息有限,无法确定具体实验的内容。但是,我们可以推测“搜狗实验”可能是关于使用Hadoop技术对海量数据进行处理的实验。例如,对搜狗搜索引擎产生的海量日志数据进行分析以改进搜索算法,或者对搜狗提供的大规模文本数据进行自然语言处理等。 5. Hadoop生态系统组件: Hadoop生态系统中除了核心组件HDFS和MapReduce之外,还包含了许多其他组件,如Hive用于处理结构化数据,Pig用于数据流处理,HBase用于非关系型数据库服务,ZooKeeper用于协调分布式应用等。根据描述中的“hadoop.ziphadoop”可能是一个自定义模块或组件,但具体详情需要进一步资料支持。 6. 文件压缩与分发: 文件压缩与分发是大数据处理中的一个重要环节。在Hadoop环境中,通常会使用特定的压缩格式(如Snappy或Gzip)对数据进行压缩,以便于存储和传输。同时,Hadoop自带的工具(如Hadoop Distcp)允许高效地在HDFS之间复制、移动大量数据。 7. Java Hadoop开发环境搭建: 要开发Java Hadoop程序,首先需要搭建开发环境。这包括安装Java开发工具包(JDK)、设置Hadoop环境变量以及集成开发环境(IDE),如Eclipse或IntelliJ IDEA。此外,开发者通常还需要配置Hadoop的Eclipse插件或IntelliJ插件,以便更好地与Hadoop集群进行交互。 8. Hadoop作业提交与管理: 在Hadoop中提交作业到集群后,用户可以通过Hadoop自带的管理工具监控作业的运行状态。常见的管理工具有Web界面(如Ambari、Hue)、命令行工具(如hadoop fs)等。此外,Hadoop支持YARN(Yet Another Resource Negotiator),这是一个资源管理平台,可以动态地分配和管理集群资源,使得Hadoop能够更有效地处理作业。 通过以上的知识点,我们可以看出Hadoop技术在大数据处理领域的强大功能以及Java在其中扮演的重要角色。这些知识点不仅涉及了Hadoop的基础架构、MapReduce编程模型,还涵盖了与Hadoop相关的生态系统组件和环境搭建等内容,为理解和实现搜狗实验提供了理论基础和技术支持。

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ALTER DATABASE test1 RENAME TO test2; NoViableAltException(254@[]) at org.apache.hadoop.hive.ql.parse.HiveParser.alterDatabaseStatementSuffix(HiveParser.java:9043) at org.apache.hadoop.hive.ql.parse.HiveParser.alterStatement(HiveParser.java:7647) at org.apache.hadoop.hive.ql.parse.HiveParser.ddlStatement(HiveParser.java:4337) at org.apache.hadoop.hive.ql.parse.HiveParser.execStatement(HiveParser.java:2494) at org.apache.hadoop.hive.ql.parse.HiveParser.statement(HiveParser.java:1420) at org.apache.hadoop.hive.ql.parse.ParseDriver.parse(ParseDriver.java:220) at org.apache.hadoop.hive.ql.parse.ParseUtils.parse(ParseUtils.java:74) at org.apache.hadoop.hive.ql.parse.ParseUtils.parse(ParseUtils.java:67) at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:616) at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:1826) at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:1773) at org.apache.hadoop.hive.ql.Driver.compileAndRespond(Driver.java:1768) at org.apache.hadoop.hive.ql.reexec.ReExecDriver.compileAndRespond(ReExecDriver.java:126) at org.apache.hadoop.hive.ql.reexec.ReExecDriver.run(ReExecDriver.java:214) at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:239) at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:188) at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:402) at org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:821) at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:759) at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:683) 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.util.RunJar.run(RunJar.java:318) at org.apache.hadoop.util.RunJar.main(RunJar.java:232) FAILED: ParseException line 1:21 cannot recognize input near 'test1' 'RENAME' 'TO' in alter database statement

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at org.apache.hadoop.ipc.Client.call(Client.java:1476) at org.apache.hadoop.ipc.Client.call(Client.java:1413) at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229) at com.sun.proxy.$Proxy29.mkdirs(Unknown Source) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.mkdirs(ClientNamenodeProtocolTranslatorPB.java:563) 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.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:191) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102) at com.sun.proxy.$Proxy30.mkdirs(Unknown Source) at org.apache.hadoop.hdfs.DFSClient.primitiveMkdir(DFSClient.java:3014) at org.apache.hadoop.hdfs.DFSClient.mkdirs(DFSClient.java:2984) at org.apache.hadoop.hdfs.DistributedFileSystem$21.doCall(DistributedFileSystem.java:1047) at org.apache.hadoop.hdfs.DistributedFileSystem$21.doCall(DistributedFileSystem.java:1043) at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81) at org.apache.hadoop.hdfs.DistributedFileSystem.mkdirsInternal(DistributedFileSystem.java:1043) at org.apache.hadoop.hdfs.DistributedFileSystem.mkdirs(DistributedFileSystem.java:1036) at org.apache.hadoop.hive.ql.session.SessionState.createPath(SessionState.java:751) at org.apache.hadoop.hive.ql.session.SessionState.createSessionDirs(SessionState.java:674) at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:586)

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Java对hdfs操作报如下错误,请问怎么解决?错误如下:Exception in thread "main" java.io.IOException: (null) entry in command string: null chmod 0700 I:\tmp\hadoop-22215\mapred\staging\222151620622033\.staging at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:770) at org.apache.hadoop.util.Shell.execCommand(Shell.java:866) at org.apache.hadoop.util.Shell.execCommand(Shell.java:849) at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:733) at org.apache.hadoop.fs.RawLocalFileSystem.mkOneDirWithMode(RawLocalFileSystem.java:491) at org.apache.hadoop.fs.RawLocalFileSystem.mkdirsWithOptionalPermission(RawLocalFileSystem.java:532) at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:509) at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:305) at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:133) at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:144) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1290) at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1287) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1698) at org.apache.hadoop.mapreduce.Job.submit(Job.java:1287) at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1308) at com.sl.maxTemperature.main(maxTemperature.java:41)

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