https://blog.csdn.net/weixin_42158422/article/details/88876943…

问题详情  解决办法 [hadoop@master ~]$ hadoop job -kill job_1493782088693_0001 DEPRECATED: Use of this script to execute mapred command is deprecated. Instead use the mapred command for it. // :: WARN util.NativeCodeLoader: Unable to load native-hadoop librar…

hive中field如果是string,比如id,那么使用10000000000+id结果是科学计数法显示,转换为正常显示方法: select (10000000000+cast(id as int)) as id from tb1 limit 10; hive 调用java的函数,必须是静态类函数 select reflect ("java.lang.String","valueOf",id) from tb1 limit 1; select reflect (&…

转自:http://www.2cto.com/database/201209/153858.html 网上搜索到的解决办法: 1.找到mysql安装目录下的bin目录路径. 2.打开cmd,进入到bin目录的路径下,输入mysql -u root -p. 问题分析: 1.查看mysql command line client默认执行的一些参数.方法:开始->所有程序->MySQL->MySQL Server5.5->MySQL5.5 command line client,右键属性…

推荐 MapReduce分析明星微博数据 http://git.oschina.net/ljc520313/codeexample/tree/master/bigdata/hadoop/mapreduce/05.%E6%98%8E%E6%98%9F%E5%BE%AE%E5%8D%9A%E6%95%B0%E6%8D%AE%E5%88%86%E6%9E%90?dir=1&filepath=bigdata%2Fhadoop%2Fmapreduce%2F05.%E6%98%8E%E6%98%9F%E5%…

转自:http://www.iteblog.com/archives/831 如果你想查询某个表的某一列,Hive默认是会启用MapReduce Job来完成这个任务,如下: hive> SELECT ; Total MapReduce jobs = Launching Job out of Number of reduce tasks is set to since there's no reduce operator Cannot run job locally: Input Size (=…

假设你想查询某个表的某一列.Hive默认是会启用MapReduce Job来完毕这个任务,例如以下: 01 hive> SELECT id, money FROM m limit 10; 02 Total MapReduce jobs = 1 03 Launching Job 1 out of 1 04 Number of reduce tasks is set to 0 since there's no reduce operator 05 Cannot run job locally: In…

写于2016.7月 最近项目需要在hbase上做统计分析,在本机上装了hive,结果跑小批量数据sum时报错: hive> select count(*) from page_view; Total jobs = Launching Job out of Number of reduce tasks determined at compile In order to change the average load for a reducer (in bytes): set hive.exec.r…

1.     前言 本文的目的是让一个从未接触Hadoop的人,在很短的时间内快速上手,掌握编译.安装和简单的使用. 2.     Hadoop家族 截止2009-8-19日,整个Hadoop家族由以下几个子项目组成: 成员名 用途 Hadoop Common Hadoop体系最底层的一个模块,为Hadoop各子项目提供各种工具,如:配置文件和日志操作等. Avro Avro是doug cutting主持的RPC项目,有点类似Google的protobuf和Facebook的thrift.avr…

multithreading - How do you kill a Thread in Java? - Stack Overflowhttps://stackoverflow.com/questions/671049/how-do-you-kill-a-thread-in-java THI05-J. Do not use Thread.stop() to terminate threads - SEI CERT Oracle Coding Standard for Java - Conflue…