容易发生数据倾斜。可以用MapJoin把小表全部加载到内存在map端进行join,避免reducer处理。 1、开启MapJoin参数设置 (1)设置自动选择Mapjoin (2)大表小表的阀值设置(默认25M一下认为是小表): 2、MapJo... hive 大小表mapjoin 遇到udf失效问题 hive 大小表mapjoin 遇到udf失效问题 执行结果有三个重要信息: /...
I have some code to init map with points. Coord of points I get from json and in the end of file I have a filter. I need to hide/show some points on map. How I can do it? setStyle() or change size of ... Trouble recording videos ...
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* @param o * @return */ public int compareTo(RateBean o) { return o.rate-this.rate; } public void write(DataOutput out) throws IOException { out.writeInt(uid); out.writeInt(movie); out.writeInt(rate); out.writeLong(datetime); } public void readFields(DataInput in) throws IOExceptio...
hive操作 一、创建元数据保存在Mysql中 1)修改配置文件 <!--add by gaojingsong --> <property> <name>javax.jdo.option.ConnectionURL</name> <value>jdbc:mysql://192.168.1.1 ...
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You must make your changes in hive-site.xml instead.-->252627<!--Hive Execution Parameters-->28<property>29<name>mapred.reduce.tasks</name>30<value>-1</value>31<description>The default number of reduce tasks per job. Typically set32to a prime close to the number of available hosts. Ig...
Hive queries are written in HiveQL, which is a query language similar to SQL.Hive allows you to project structure on largely unstructured data. After you define the structure, you can use HiveQL to query the data without knowledge of Java or MapReduce....
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