HIVE详解大数据

添加如下代码
export HIVE_HOME=/usr/hive
export HIVE_CONF_DIR=${HIVE_HOME}/conf

hive-site.xml相关的配置
A:cd hive/
B:cp conf/hive-default.xml.template conf/hive-site.xml

使用hadoop新建hdfs目录
A:su wuyang
B:/usr/hadoop/bin/hadoop fs -mkdir -p /user/hive/warehouse
C:/usr/hadoop/bin/hadoop fs -chmod 777 /user/hive/warehouse
D:/usr/hadoop/bin/hadoop fs -mkdir -p /tmp/hive/
E:/usr/hadoop/bin/hadoop fs -chmod 777 /tmp/hive

A: /usr/hadoop/bin/hadoop fs -ls /user/hive
B:/usr/hadoop/bin/hadoop fs -ls /tmp 切换到root

修改hive-site.xml中的临时目录
A:将vi conf/hive-site.xml文件中的${system:java.io.tmpdir}替换为hive的临时目录，例如我替换为/usr/hive/tmp，该目录如果不存在则要自己手工创建，并且赋予读写权限。
B:将${system:user.name}都替换为root

修改vi conf/hive-site.xml数据库相关的配置
A: name javax.jdo.option.ConnectionURL /name
value jdbc:mysql://192.168.193.201:3306/hive?createDatabaseIfNotExist=true /value
B: name javax.jdo.option.ConnectionDriverName /name
value com.mysql.jdbc.Driver /value
C: name javax.jdo.option.ConnectionUserName /name
value root /value
D: name javax.jdo.option.ConnectionPassword /name
value root /value
E: name hive.metastore.schema.verification /name
value false /value

hive-env.sh文件并进行修改
A: cp conf/hive-env.sh.template conf/hive-env.sh
B:vi conf/hive-env.sh
C:export HADOOP_HOME=/usr/hadoop
export HIVE_CONF_DIR=/usr/hive/conf
export HIVE_AUX_JARS_PATH=/usr/hive/lib

对数据库进行初始化
./schematool -initSchema -dbType mysql
出现SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/hive/lib/log4j-slf4j-impl-2.4.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/hadoop/share/hadoop/common/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]
Metastore connection URL: jdbc:mysql://127.0.0.1:3306/hive?createDatabaseIfNotExist=true
Metastore Connection Driver : com.mysql.jdbc.Driver
Metastore connection User: root
Starting metastore schema initialization to 2.1.0
Initialization script hive-schema-2.1.0.mysql.sql
Initialization script completed
schemaTool completed

启动hive
./hive
出现SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/hive/lib/log4j-slf4j-impl-2.4.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/hadoop/share/hadoop/common/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]
Logging initialized using configuration in jar:file:/usr/hive/lib/hive-common-2.1.1.jar!/hive-log4j2.properties Async: true
Hive-on-MR is deprecated in Hive 2 and may not be available in the future versions. Consider using a different execution engine (i.e. spark, tez) or using Hive 1.X releases.hive

测试
show functions;
出现
=
^
abs
acos
add_months
aes_decrypt
aes_encrypt
and
array
array_contains
ascii
asin
assert_true
atan
avg
base64
between
bin
bround
case
cbrt
ceil
ceiling
chr
coalesce
collect_list
collect_set
compute_stats
concat
concat_ws
context_ngrams
conv
corr
cos
count
covar_pop
covar_samp
crc32
create_union
cume_dist
current_database
current_date
current_timestamp
current_user
date_add
date_format
date_sub
datediff
day
dayofmonth
decode
degrees
dense_rank
div
e
elt
encode
ewah_bitmap
ewah_bitmap_and
ewah_bitmap_empty
ewah_bitmap_or
exp
explode
factorial
field
find_in_set
first_value
floor
format_number
from_unixtime
from_utc_timestamp
get_json_object
get_splits
greatest
hash
hex
histogram_numeric
hour
if
in
in_file
index
initcap
inline
instr
isnotnull
isnull
java_method
json_tuple
lag
last_day
last_value
lcase
lead
least
length
levenshtein
like
ln
locate
log
log10
log2
lower
lpad
ltrim
map
map_keys
map_values
mask
mask_first_n
mask_hash
mask_last_n
mask_show_first_n
mask_show_last_n
matchpath
max
md5
min
minute
month
months_between
named_struct
negative
next_day
ngrams
noop
noopstreaming
noopwithmap
noopwithmapstreaming
not
ntile
nvl
or
parse_url
parse_url_tuple
percent_rank
percentile
percentile_approx
pi
pmod
posexplode
positive
pow
power
printf
quarter
radians
rand
rank
reflect
reflect2
regexp
regexp_extract
regexp_replace
repeat
replace
reverse
rlike
round
row_number
rpad
rtrim
second
sentences
sha
sha1
sha2
shiftleft
shiftright
shiftrightunsigned
sign
sin
size
sort_array
soundex
space
split
sqrt
stack
std
stddev
stddev_pop
stddev_samp
str_to_map
struct
substr
substring
substring_index
sum
tan
to_date
to_unix_timestamp
to_utc_timestamp
translate
trim
trunc
ucase
unbase64
unhex
unix_timestamp
upper
var_pop
var_samp
variance
version
weekofyear
when
windowingtablefunction
xpath
xpath_boolean
xpath_double
xpath_float
xpath_int
xpath_long
xpath_number
xpath_short
xpath_string
year
|
~
Time taken: 3.756 seconds, Fetched: 237 row(s) 执行查看sum函数的详细信息的命令
desc function sum;
出现OK
sum(x) Returns the sum of a set of numbers
Time taken: 4.509 seconds, Fetched: 1 row(s)

执行新建数据库的hive命令
create database db_hive_wuyang;

创建表
create table student(id int,name string) row format delimited fields terminated by /t

将文件数据写入表中
A:touch /usr/hive/student.txt
B:vi student.txt
C:001 zhangsan
002 lisi
003 wangwu
004 zhaoliu
005 chengqi
D:load data local inpath /usr/hive/student.txt into table db_hive_wuyang.student;

查看是否写入成功
select * from student;

原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/9075.html

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