Hadoop

Hadoop的启动和停止说明

由 ↘锁芯ラ 提交于 2021-01-03 08:01:09
Hadoop的启动和停止说明 sbin/start-all.sh 启动所有的Hadoop守护进程。包括NameNode、 Secondary NameNode、DataNode、ResourceManager、NodeManager sbin/stop-all.sh 停止所有的Hadoop守护进程。包括NameNode、 Secondary NameNode、DataNode、ResourceManager、NodeManager sbin/start-dfs.sh 启动Hadoop HDFS守护进程NameNode、SecondaryNameNode、DataNode sbin/stop-dfs.sh 停止Hadoop HDFS守护进程NameNode、SecondaryNameNode和DataNode sbin/hadoop-daemons.sh start namenode 单独启动NameNode守护进程 sbin/hadoop-daemons.sh stop namenode 单独停止NameNode守护进程 sbin/hadoop-daemons.sh start datanode 单独启动DataNode守护进程 sbin/hadoop-daemons.sh stop datanode 单独停止DataNode守护进程 sbin/hadoop-daemons.sh

hadoop启动脚本基础分析

由 柔情痞子 提交于 2021-01-01 08:38:45
Hadoop Version：1.0.1 start-all.sh #总启动开关 1. start dfs daemons 1.1 start namenode call hadoop-daemon.sh(num:135) --> call hadoop, start service, define java memory 1.2 start datanode call hadoop-daemons.sh --> call slave.sh --(ssh)--> slave server,start service 1.3 start secondarynamenode call hadoop-daemons.sh --> call slave.sh --(ssh)--> master server,start service 2. start mapred daemons 2.1 start jobstracker call hadoop-daemon.sh --> call hadoop, start service, define java memory 2.2 start taskstracker call hadoop-daemons.sh --> call slave.sh --(ssh)--> slave server, start service

How do I import classes from one or more local .jar files into a Spark/Scala Notebook?

由 隐身守侯 提交于 2021-01-01 08:13:35
问题 I am struggling to load classes from JARs into my Scala-Spark kernel Jupyter notebook. I have jars at this location: /home/hadoop/src/main/scala/com/linkedin/relevance/isolationforest/ with contents listed as follows: -rwx------ 1 hadoop hadoop 7170 Sep 11 20:54 BaggedPoint.scala -rw-rw-r-- 1 hadoop hadoop 186719 Sep 11 21:36 isolation-forest_2.3.0_2.11-1.0.1.jar -rw-rw-r-- 1 hadoop hadoop 1482 Sep 11 21:36 isolation-forest_2.3.0_2.11-1.0.1-javadoc.jar -rw-rw-r-- 1 hadoop hadoop 20252 Sep 11

How do I import classes from one or more local .jar files into a Spark/Scala Notebook?

由 独自空忆成欢 提交于 2021-01-01 08:12:06
问题 I am struggling to load classes from JARs into my Scala-Spark kernel Jupyter notebook. I have jars at this location: /home/hadoop/src/main/scala/com/linkedin/relevance/isolationforest/ with contents listed as follows: -rwx------ 1 hadoop hadoop 7170 Sep 11 20:54 BaggedPoint.scala -rw-rw-r-- 1 hadoop hadoop 186719 Sep 11 21:36 isolation-forest_2.3.0_2.11-1.0.1.jar -rw-rw-r-- 1 hadoop hadoop 1482 Sep 11 21:36 isolation-forest_2.3.0_2.11-1.0.1-javadoc.jar -rw-rw-r-- 1 hadoop hadoop 20252 Sep 11

Deleting Part of a string in HIVE

由 瘦欲@ 提交于 2021-01-01 06:42:13
问题 I am trying to delete a part of a string in HIVE. I want to delete the last eleven characters for all records in a column. The data looks like: 1018492743|0001-01-01 I want it to look like: 1018492743 The code I have tried looks like: Select right(a.ord_id, len(a.ord_id)-ll) It isn't working because len isnt a function in HIVE Another issue I have is that some of the records are already in the correct format. Does this mean I need to create a case statement that checks for this? 回答1: You can

Deleting Part of a string in HIVE

由 杀马特。学长 韩版系。学妹 提交于 2021-01-01 06:38:05
问题 I am trying to delete a part of a string in HIVE. I want to delete the last eleven characters for all records in a column. The data looks like: 1018492743|0001-01-01 I want it to look like: 1018492743 The code I have tried looks like: Select right(a.ord_id, len(a.ord_id)-ll) It isn't working because len isnt a function in HIVE Another issue I have is that some of the records are already in the correct format. Does this mean I need to create a case statement that checks for this? 回答1: You can

Deleting Part of a string in HIVE

由 佐手、 提交于 2021-01-01 06:37:48
问题 I am trying to delete a part of a string in HIVE. I want to delete the last eleven characters for all records in a column. The data looks like: 1018492743|0001-01-01 I want it to look like: 1018492743 The code I have tried looks like: Select right(a.ord_id, len(a.ord_id)-ll) It isn't working because len isnt a function in HIVE Another issue I have is that some of the records are already in the correct format. Does this mean I need to create a case statement that checks for this? 回答1: You can

storm的基本概念安装测试

由 a 夏天 提交于 2021-01-01 02:02:21
strom简介 官方网址： http://storm.apache.org/ 是一个免费，开源的分布式实时计算系统，使用它可以轻松实现数据流的实时处理，Strom很简单，可以用任何编程语言 storm用例：实时在线分析 机器学习，连续计算，分布式RPC，ETL等。 Strom的特点：快速：基准时钟在超过一百万元组（可以理解为数据包）每秒处理的每个节点 简单的设置：有可扩展性，容错性，保证了数据的处理能力，并且易于设置和操作 storm实时流式计算系统 storm集群与hadoop集群（MapReduce）对比 MapReduce是批处理流程 //hadoop处理海量历史任务，不能做到实时 storm没有缓冲区原数据源源不断的进入处理系统，这是流处理 //实时流计算，一直运行直到停止。 Topology（拓扑）与 Mapreduce 一个关键的区别是： 一个MapReduce job 最终会结束， 而一个topology 永远会运行（除非你手动kill 掉） Nimbus（作业控制和资源管理 master进程） 与ResourManager 在Storm 的集群里面有两种节点： 控制节点（master node）和工作节点（worker node）。控制节点上面运行一个叫Nimbus 后台程序，它的作用类似Hadoop 里面的JobTracker /

How to create a HIVE table to read semicolon separated values

由 女生的网名这么多〃 提交于 2020-12-30 17:22:07
问题 I want to create a HIVE table that will read in semicolon separated values, but my code keeps giving me errors. Does anyone have any suggestions? CREATE TABLE test_details(Time STRING, Vital STRING, sID STRING) PARTITIONED BY(Country STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY ';' STORED AS TEXTFILE; 回答1: For me nothing worked except this: FIELDS TERMINATED BY '\u0059' Edit: After updating Hive: FIELDS TERMINATED BY '\u003B' so in full: CREATE TABLE test_details(Time STRING, Vital

How to create a HIVE table to read semicolon separated values

由 妖精的绣舞 提交于 2020-12-30 17:21:24
问题 I want to create a HIVE table that will read in semicolon separated values, but my code keeps giving me errors. Does anyone have any suggestions? CREATE TABLE test_details(Time STRING, Vital STRING, sID STRING) PARTITIONED BY(Country STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY ';' STORED AS TEXTFILE; 回答1: For me nothing worked except this: FIELDS TERMINATED BY '\u0059' Edit: After updating Hive: FIELDS TERMINATED BY '\u003B' so in full: CREATE TABLE test_details(Time STRING, Vital
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