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hive日常

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hive

1、sql

select ROUND(RAND()*1000,0) from dual; 生成随机数

2、hive创建临时表

create TEMPORARY table up_speed select a.place,a.quart,a.year,a.kwh/b.kwh-1 as elec_speed_up from (select c.place,c.year,c.quart,sum(c.kwh) as kwh from user_h_growth c group by place,quart,year) a JOIN (select d.place,d.year,d.quart,sum(d.kwh) as kwh from user_h_growth d grou```

3、

drop database aaa cascade⋯⋯傻琪记不住命令

4、

支持Python中运行hive语句，还需要安装bison 下载thrift依赖的东西 yum -y install automake libtool flex bison pkgconfig gcc-c++ boost-devel libevent-devel zlib-devel Python-devel ruby-devel crypto-utils openssl openssl-devel

8、

hive调用的包明明在本机存在，却报不存在，需要把端口kill掉重启hive --service hiveserver 重启，因为ambari开机时会自动起一个10086，这个端口是不能用的。

10、

ORA-12899: value too large for column 列宽太小，修改列宽

11、

hive的join 要用on 用where的时候outer join不起作用和inner join一样····（这都能差······）

14、http://blog.sina.com.cn/s/blog_6ff05a2c010131sh.html

17、

Hive没有关系数据库的临时表，只能先生成一个表后再用完再删除

18、oracle insert数据后需要commit 否则不生效

19、http://blog.csdn.net/mashroomxl/article/details/22223777 and or的坑

20、

今天完成一个简单的join，却一直报

org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row

这样的错误，还具体列出了某行，查询两表，均有该字段···

最后解决。

就是把小的表加入内存，可以配置以下参数，是hive自动根据sql，选择使用common join或者map join

set hive.auto.convert.join = true;

hive.mapjoin.smalltable.filesize 默认值是25mb

21、hive oracle语句有很多函数区别，比如参数，hive没有to_char，oracle需要trun之类,最大的区别是字段标识 hive子查询可以没有标识符，字段得加AS

oracle子查询表需要加标识符

22、

不能从表中查取数据存入csv中

2015-05-22 14:23:44,354 WARN org.apache.hadoop.mapred.Child: Error running child
java.lang.RuntimeException: java.lang.AbstractMethodError: com.bizo.hive.serde.csv.CSVSerde.getSerDeStats()Lorg/apache/hadoop/hive/serde2/SerDeStats;
    at org.apache.hadoop.hive.ql.exec.ExecMapper.map(ExecMapper.java:161)
    at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
    at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:436)
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:372)
    at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:396)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
    at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.lang.AbstractMethodError: com.bizo.hive.serde.csv.CSVSerde.getSerDeStats()Lorg/apache/hadoop/hive/serde2/SerDeStats;
    at org.apache.hadoop.hive.ql.exec.FileSinkOperator.processOp(FileSinkOperator.java:574)
    at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:471)
    at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:762)
    at org.apache.hadoop.hive.ql.exec.SelectOperator.processOp(SelectOperator.java:84)
    at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:471)
    at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:762)
    at org.apache.hadoop.hive.ql.exec.TableScanOperator.processOp(TableScanOperator.java:83)
    at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:471)
    at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:762)
    at org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:529)
    at org.apache.hadoop.hive.ql.exec.ExecMapper.map(ExecMapper.java:143)
    ... 8 more

23、libthrift JAR包冲突导致，libthrift-0.9.0 替换为 libthrift-0.8.0

Exception in thread "main" java.lang.RuntimeException: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient

at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:346)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:681)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:625)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
Caused by: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient
at org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1412)
at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.<init>(RetryingMetaStoreClient.java:62)
at org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.getProxy(RetryingMetaStoreClient.java:72)
at org.apache.hadoop.hive.ql.metadata.Hive.createMetaStoreClient(Hive.java:2453)
at org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:2465)
at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:340)
... 7 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1410)
... 12 more
Caused by: java.lang.NoSuchMethodError: org.apache.thrift.EncodingUtils.setBit(BIZ)B
at org.apache.hadoop.hive.metastore.api.PrivilegeGrantInfo.setCreateTimeIsSet(PrivilegeGrantInfo.java:245)
at org.apache.hadoop.hive.metastore.api.PrivilegeGrantInfo.<init>(PrivilegeGrantInfo.java:163)
at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.createDefaultRoles(HiveMetaStore.java:563)
at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.init(HiveMetaStore.java:398)
at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.<init>(HiveMetaStore.java:356)
at org.apache.hadoop.hive.metastore.RetryingHMSHandler.<init>(RetryingHMSHandler.java:54)
at org.apache.hadoop.hive.metastore.RetryingHMSHandler.getProxy(RetryingHMSHandler.java:59)
at org.apache.hadoop.hive.metastore.HiveMetaStore.newHMSHandler(HiveMetaStore.java:4944)
at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.<init>(HiveMetaStoreClient.java:171)

24、

csv-serde下载地址：http://ogrodnek.github.io/csv-serde/

用法：

add jar path/to/csv-serde.jar;

create table my_table(a string, b string,...)
 row format serde 'com.bizo.hive.serde.csv.CSVSerde'
 stored as textfile
;

自定义分隔符：

add jar path/to/csv-serde.jar;

create table my_table(a string, b string,...)
 row format serde 'com.bizo.hive.serde.csv.CSVSerde'with serdeproperties ("separatorChar"="\t","quoteChar"="'","escapeChar"="\\")	  
 stored as textfile
;