将nginx日志导入到hive中的两种方法 1 在hive中建表 CREATE TABLE apachelog (ipaddress STRING, identd STRING, user STRING
将nginx日志导入到hive中的两种方法
1 在hive中建表
导入后日志格式为
203.208.60.91 - - 05/May/2011:01:18:47 +0800 GET /robots.txt HTTP/1.1 404 1238 Mozilla/5.0
此方法支持hive中函数parse_url(referer,"HOST")
第二种方法导入
注意：这个方法在建表后，使用查询语句等前要先执行
hive> add jar /home/hjl/hive/lib/hive_contrib.jar;
或者设置hive/conf/hive-default.conf 添加
保存配置
203.208.60.91 - - [05/May/2011:01:18:47 +0800] "GET /robots.txt HTTP/1.1" 404 1238 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +)"
此方法中的字段类型stringfrom deserializer 经测试不支持parse_url(referer,"HOST")获取域名
可以用select split(referer,"/")[2] from apilog 获取域名
如果文件数据是纯文本，可以使用 STORED AS TEXTFILE。如果数据需要压缩，，使用 STORED AS SEQUENCE 。
导入日志命令
hive>load data local inpath '/home/log/map.gz' overwrite into table log;
导入日志支持.gz等格式
导入日志后进行分析 例句
统计行数
select count(*) from nginxlog;
统计IP数
select count(DISTINCT ip) from nginxlog;
排行
select t2.ip,t2.xx from (SELECT ip, COUNT(*) AS xx FROM nginxlog GROUP by ip) t2 sort by t2.xx desc
hive>SELECT * from apachelog WHERE ipaddress = '216.211.123.184';
hive> SELECT ipaddress, COUNT(1) AS numrequest FROM apachelog GROUP BY ipaddress SORT BY numrequest DESC LIMIT 1;
hive> set mapred.reduce.tasks=2;
hive> SELECT ipaddress, COUNT(1) AS numrequest FROM apachelog GROUP BY ipaddress SORT BY numrequest DESC LIMIT 1;
hive>CREATE TABLE ipsummary (ipaddress STRING, numrequest INT);
hive>INSERT OVERWRITE TABLE ipsummary SELECT ipaddress, COUNT(1) FROM apachelog GROUP BY ipaddress;
hive>SELECT ipsummary.ipaddress, ipsummary.numrequest FROM (SELECT MAX(numrequest) AS themax FROM ipsummary) ipsummarymax JOIN ipsummary ON ipsummarymax.themax = ipsummary.numrequest;
hive查询结果导出为csv的方法（未测试）
hive> set hive.io.output.fileformat=CSVTextFile;
hive> insert overwrite local directory '/tmp/CSVrepos/' select * from S where ... ;
