探索大数据:Apache Sqoop 实用指南

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"Apache Sqoop Cookbook.pdf 是一本关于Apache Sqoop的英文版技术书籍,适合对大数据处理感兴趣的读者。尽管没有中文版,但作者认为对于技术爱好者来说,阅读并不构成太大障碍,通过尝试可以有所收获。这本书由 Kathleen Ting 和 Jarek Jarcec Cecho 合著,版权属于2013年的O'Reilly Media, Inc." Apache Sqoop是一个用于在Hadoop和传统数据库之间高效传输数据的开源工具。这本书《Apache Sqoop Cookbook》深入探讨了如何利用Sqoop进行大数据的导入导出操作,帮助用户掌握如何在大规模数据集上进行工作。在大数据领域,Sqoop扮演着关键角色,因为它能够方便地将结构化数据从关系型数据库管理系統(RDBMS)如MySQL、Oracle等导入到Hadoop的HDFS中,或者反向导出数据,使得企业可以充分利用Hadoop的分布式计算能力进行数据分析,同时保持与现有数据库系统的紧密集成。 书中的内容可能涵盖了以下几个方面: 1. **Sqoop安装与配置**:介绍如何在不同的操作系统和Hadoop环境中安装和配置Sqoop,包括设置环境变量、连接数据库驱动等。 2. **数据导入导出**:详细讲解如何使用Sqoop命令行工具导入和导出数据,包括全量导入、增量导入、并行导入等策略,以提高数据迁移的效率。 3. **复杂数据类型**:讨论如何处理不同数据库系统中的复杂数据类型,如数组、结构体等,以及如何在Hadoop生态系统中有效地存储和处理这些数据。 4. **Sqoop与Hadoop生态系统整合**:介绍如何将Sqoop与其他Hadoop组件如Hive、Pig、HBase等集成,以实现更强大的数据分析流程。 5. **性能优化**:探讨如何调整参数和设置,以最大化Sqoop的数据传输速度,减少资源消耗。 6. **安全性与权限**:讲解如何在导入导出过程中处理数据安全问题,包括认证、授权和审计。 7. **案例研究与最佳实践**:通过实际应用场景,展示如何运用Sqoop解决特定的数据迁移问题,提供实施策略和经验分享。 这本书的目的是帮助读者熟练掌握Sqoop工具,从而更好地应对大数据时代的挑战。通过学习,读者不仅可以了解如何在大数据项目中有效地使用Sqoop,还能理解数据驱动决策的重要性,以及如何利用大数据分析工具创造价值。访问O'Reilly官方网站可获取更多关于大数据处理和分析的相关资源。

2023-06-10 06:10:14,356 INFO mapreduce.Job: Job job_1686300831839_0056 failed with state FAILED due to: Task failed task_1686300831839_0056_m_000001 Job failed as tasks failed. failedMaps:1 failedReduces:0 killedMaps:0 killedReduces: 0 2023-06-10 06:10:14,536 INFO mapreduce.Job: Counters: 9 Job Counters Failed map tasks=1 Killed map tasks=3 Launched map tasks=4 Data-local map tasks=4 Total time spent by all maps in occupied slots (ms)=20374 Total time spent by all reduces in occupied slots (ms)=0 Total time spent by all map tasks (ms)=20374 Total vcore-milliseconds taken by all map tasks=20374 Total megabyte-milliseconds taken by all map tasks=20862976 2023-06-10 06:10:14,561 WARN mapreduce.Counters: Group FileSystemCounters is deprecated. Use org.apache.hadoop.mapreduce.FileSystemCounter instead 2023-06-10 06:10:14,566 INFO mapreduce.ExportJobBase: Transferred 0 bytes in 19.7479 seconds (0 bytes/sec) 2023-06-10 06:10:14,582 WARN mapreduce.Counters: Group org.apache.hadoop.mapred.Task$Counter is deprecated. Use org.apache.hadoop.mapreduce.TaskCounter instead 2023-06-10 06:10:14,582 INFO mapreduce.ExportJobBase: Exported 0 records. 2023-06-10 06:10:14,582 ERROR mapreduce.ExportJobBase: Export job failed! 2023-06-10 06:10:14,585 ERROR tool.ExportTool: Error during export: Export job failed! at org.apache.sqoop.mapreduce.ExportJobBase.runExport(ExportJobBase.java:445) at org.apache.sqoop.manager.SqlManager.exportTable(SqlManager.java:931) at org.apache.sqoop.tool.ExportTool.exportTable(ExportTool.java:80) at org.apache.sqoop.tool.ExportTool.run(ExportTool.java:99) at org.apache.sqoop.Sqoop.run(Sqoop.java:147) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76) at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:183) at org.apache.sqoop.Sqoop.runTool(Sqoop.java:234) at org.apache.sqoop.Sqoop.runTool(Sqoop.java:243) at org.apache.sqoop.Sqoop.main(Sqoop.java:252)

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ERROR sqoop.Sqoop: Got exception running Sqoop: java.lang.NullPointerException java.lang.NullPointerException at org.json.JSONObject.<init>(JSONObject.java:144) at org.apache.sqoop.util.SqoopJsonUtil.getJsonStringforMap(SqoopJsonUtil.java:43) at org.apache.sqoop.SqoopOptions.writeProperties(SqoopOptions.java:867) at org.apache.sqoop.mapreduce.JobBase.putSqoopOptionsToConfiguration(JobBase.java:393) at org.apache.sqoop.mapreduce.JobBase.createJob(JobBase.java:379) at org.apache.sqoop.mapreduce.ImportJobBase.runImport(ImportJobBase.java:255) at org.apache.sqoop.manager.SqlManager.importQuery(SqlManager.java:747) at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:536) at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:633) at org.apache.sqoop.Sqoop.run(Sqoop.java:146) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76) at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:182) at org.apache.sqoop.Sqoop.runTool(Sqoop.java:233) at org.apache.sqoop.Sqoop.runTool(Sqoop.java:242) at org.apache.sqoop.Sqoop.main(Sqoop.java:251) Log Type: stdout Log Upload Time: Mon Jul 24 10:47:38 +0800 2023 Log Length: 74530 Showing 4096 bytes of 74530 total. Click here for the full log. 35517561_3806_01_000001: PRELAUNCH_OUT=/yarn/container-logs/application_1683335517561_3806/container_1683335517561_3806_01_000001/prelaunch.out: NM_AUX_SERVICE_mapreduce_shuffle=AAA0+gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=: NM_PORT=8041: HADOOP_YARN_HOME=/opt/cloudera/parcels/CDH-6.3.2-1.cdh6.3.2.p0.1605554/lib/hadoop-yarn: USER=admin: CLASSPATH=/yarn/nm/usercache/admin/appcache/application_1683335517561_3806/container_1683335517561_3806_01_000001:/yarn/nm/usercache/admin/appcache/application_1683335517561_3806/container_1683335517561_3806_01_000001/*:/etc/hadoop/conf.cloudera.yarn:/opt/cloudera/parcels/CDH-6.3.2-1.cdh6.3.2.p0.1605554/lib/hadoop/*:/opt/cloudera/parcels/CDH-6.3.2-1.cdh6.3.2.p0.1605554/lib/hadoop/lib/*:/opt/cloudera/parcels/CDH-6.3.2-1.cdh6.3.2.p0.1605554/lib/hadoop-hdfs/*:/opt/cloudera/parcels/CDH-6.3.2-1.cdh6.3.2.p0.1605554/lib/hadoop-hdfs/lib/*:/opt/cloudera/parcels/CDH-6.3.2-1.cdh6.3.2.p0.1605554/lib/hadoop-yarn/*:/opt/cloudera/parcels/CDH-6.3.2-1.cdh6.3.2.p0.1605554/lib/hadoop-yarn/lib/*:: PRELAUNCH_ERR=/yarn/container-logs/application_1683335517561_3806/container_1683335517561_3806_01_000001/prelaunch.err: HADOOP_TOKEN_FILE_LOCATION=/yarn/nm/usercache/admin/appcache/application_1683335517561_3806/container_1683335517561_3806_01_000001/container_tokens: LOCAL_USER_DIRS=/yarn/nm/usercache/admin/: OOZIE_ACTION_CONF_XML=/yarn/nm/usercache/admin/appcache/application_1683335517561_3806/container_1683335517561_3806_01_000001/action.xml: SHLVL=2: HOME=/home/: CONTAINER_ID=container_1683335517561_3806_01_000001: MALLOC_ARENA_MAX=4:怎么回事

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