hbase command combing

The following commands are based on the hbase version:

hbase(main):041:0> version
1.2.0-cdh5.7.1, rUnknown, Wed Jun  1 16:30:06 PDT 2016

general

status: View hbase status

hbase(main):002:0> status
1 active master, 1 backup masters, 4 servers, 0 dead, 0.5000 average load

table_help: simple entry to table operation

t = create 't','cf'  
t = get_table 't'
t.put 'r1','cf:q','v'
t.scan
t.disable
t.enable
t.flush
t.disable
t.drop

whoami: View current users and groups

hbase(main):252:0* whoami
chengguoqiang (auth:SIMPLE)
    groups: chengguoqiang, wheel

ddl operation

list View list of tables
create Create table
exists Check whether the table exists
describe / desc view table structure
enable / enable_all / is_enabled table is available for production, judge whether production is available
disable / disable_all / is_disabled Disable table, determine whether to disable
drop / drop_all delete table
get_table Get an instance
locate_region returns the region, new hbase command
show_filters has no use for the time being
Alter modifies the table structure, the hbase.online.schema.update.enable parameter determines whether it can be modified in production
alter_async asynchronously modify the table structure

hbase(main):088:0* exists 't'
hbase(main):089:0> desc 't'
hbase(main):090:0> alter 't',{NAME=>'cf', VERSIONS=>'5'}, {NAME=>'cf1', VERSIONS=>'3', COMPRESSION=>'GZ',TTL=>'86400',IN_MEMORY=>'true'}
hbase(main):092:0> alter_status 't'

When creating a table, hbase assigns a region to the table by default. All read and write requests will access the same region of the regionServer. At this time, the effect of load balancing cannot be achieved, and other regionServers in the cluster may be relatively idle. status. To solve this problem, you can use pre-splitting, which is configured when the table is created to generate multiple regions. Hbase comes with two pre-split algorithms, HexStringSplit and UniformSplit . If our row key is a hexadecimal string as a prefix, it is more suitable to use HexStringSplit as a pre-split algorithm . For example, we use HexHash (prefix) as the prefix of the row key, where Hexhash is the hash algorithm that finally gets the hexadecimal string. We can also use our own split algorithm.

create 'profile:test','data',{NUMREGIONS => 4, SPLITALGO => 'HexStringSplit', REGION_REPLICATION => 1}

namespace

list_namespace Namespace list
create_namespace Create a namespace
describe_namespace Namespace description
list_namespace_tables View tables in the specified namespace
alter_namespace modify or add namespace attributes
drop_namespace delete the namespace, it must be an empty namespace

hbase(main):028:0> create_namespace 'profile'
hbase(main):029:0> list_namespace 'profile'
hbase(main):036:0* alter_namespace 'profile',{METHOD=>'set', 'TEST_PROPERTY'=>'TEST_VALUE'}
hbase(main):030:0> describe_namespace 'profile'

dml

put insert a record
append Put if the record does not exist, append value if it exists
get Get a record
scan scan record
count Get the number
delete delete rowkey, column must be specified
deleteall delete the entire rowkey
incr counter, insert a record, add 1 if it exists
get_counter returns the counter value
truncate empty table
truncate_preserve clears the table, but saves the partition information
get_splits returns a list of partitions

hbase(main):005:0> put 't','r1','cf1:q1','v1',{ATTRIBUTES=>{'att1'=>'val1'}}
hbase(main):006:0> scan 't'
hbase(main):007:0> get 't','r1',{COLUMN => 'cf1'}
hbase(main):042:0* put 't','r2','cf1:q2','v2',{ATTRIBUTES=>{'att1'=>'val1'}}

hbase(main):043:0> put 't','r3','cf1:q2','v3',{ATTRIBUTES=>{'att1'=>'val1'}}

hbase(main):044:0> put 't','r5','cf1:q5','v5',{ATTRIBUTES=>{'att1'=>'val1'}}`
hbase(main):045:0> put 't','r11','cf1:q11','v11',{ATTRIBUTES=>{'att1'=>'val1'}}
hbase(main):046:0> put 't','r8','cf1:q8','v8',{ATTRIBUTES=>{'att1'=>'val1'}}
scan 't',{COLUMN=>'cf1',LIMIT=>5, STARTROW=>'r2', ENDROW=>'r5'}
hbase(main):059:0* delete 't','r5','cf1:q5'
hbase(main):076:0* count 't'
hbase(main):051:0> incr 't','r2','cf1:q5'
hbase(main):053:0> get_counter 't','r2','cf1:q5'

hbase(main):105:0> create 'profile:t1','cf1',{SPLITS=>['a','b','c']}
hbase(main):105:0> get_split 'profile:t1'

security

grant authorization, can be refined to column
revoke cancel authorization
user_permission View table open permissions

READ(‘R’), WRITE(‘W’), EXEC(‘X’), CREATE(‘C’), ADMIN(‘A’)

// Syntax : grant <user> <permissions> [<@namespace> [<table> [<column family> [<column qualifier>]]]
grant 'chengguoqiang','RW', 'profile:yingyun'

// Syntax : user_permission <table>
user_permission 'profile:yingyun'


// Syntax : revoke <user> [<table> [<column family> [<column qualifier>]]
revoke 'chengguoqiang','profile:yingyun'

Reprinted from: https://blog.csdn.net/baidu_35482842/article/details/51803639