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hive 存储格式
hive有textFile,SequenceFile,RCFile三种文件格式。
textfile为默认格式,建表时不指定默认为这个格式,导入数据时会直接把数据文件拷贝到hdfs上不进行处理。
SequenceFile,RCFile格式的表不能直接从本地文件导入数据,数据要先导入到textfile格式的表中,
然后再从textfile表中用insert导入到SequenceFile,RCFile表中。
create table zone0000tf(ra int, dec int, mag int) row format delimited fields terminated by ‘|‘;
create table zone0000rc(ra int, dec int, mag int) row format delimited fields terminated by ‘|‘ stored as rcfile;
load data local inpath ‘/home/cq/usnoa/zone0000.asc ‘ into table zone0000tf;
insert overwrite table zone0000rc select * from zone0000tf;(begin a job)
File Format
TextFile | SequenceFIle | RCFFile | |
Data type | Text Only | Text/Binary | Text/Binary |
Internal Storage Order | Row-based | Row-based | Column-based |
Compression | File Based | Block Based | Block Based |
Splitable | YES | YES | YES |
Splitable After Compression | No | YES | YES |