Hbase深入学习(四) Hbase操作命令列表
Hbase深入学习(四) Hbase操作命令列表
Connect to yourrunning hbase via the shell.
$ ./hbase shell
[WARN ]-XX:OnOutOfMemoryError=kill -9 %p is not a valid VM option. Ignoring
[WARN ]-XX:+UseConcMarkSweepGC is not a valid VM option. Ignoring
HBase Shell; enter'help<RETURN>' for list of supported commands.
Type"exit<RETURN>" to leave the HBase Shell
Version 0.94.11,r1513697, Wed Aug 14 04:54:46 UTC 2013
hbase(main):001:0>
Type help and then<return> to see a listing of shell commands and options.
HBase Shell, version0.94.11, r1513697, Wed Aug 14 04:54:46 UTC 2013
Type 'help"COMMAND"', (e.g. 'help "get"' -- the quotes are necessary)for help ona specific command.
Commands aregrouped. Type 'help "COMMAND_GROUP"', (e.g. 'help"general"') for h elp on acommand group.
COMMAND GROUPS:
Group name: general
Commands: status, version, whoami
Group name: ddl
Commands: alter, alter_async, alter_status,create, describe, disable, disable _all,drop, drop_all, enable, enable_all, exists, is_disabled, is_enabled, list, show_filters
Group name: dml
Commands: count, delete, deleteall, get,get_counter, incr, put, scan, truncat e
Group name: tools
Commands: assign, balance_switch, balancer,close_region, compact, flush, hlog _roll,major_compact, move, split, unassign, zk_dump
Group name: replication
Commands: add_peer, disable_peer, enable_peer,list_peers, list_replicated_tab les, remove_peer, start_replication, stop_replication
Group name: snapshot
Commands: clone_snapshot, delete_snapshot,list_snapshots, restore_snapshot, s napshot
Group name: security
Commands: grant, revoke, user_permission
SHELL USAGE:
Quote all names inHBase Shell such as table and column names. Commas delimit
commandparameters. Type <RETURN> afterentering a command to run it.
Dictionaries of configurationused in the creation and alteration of tables are
Ruby Hashes. Theylook like this:
{'key1' => 'value1', 'key2' =>'value2', ...}
and are opened andclosed with curley-braces. Key/valuesare delimited by the
'=>' charactercombination. Usually keys are predefinedconstants such as
NAME, VERSIONS,COMPRESSION, etc. Constants do not needto be quoted. Type
'Object.constants'to see a (messy) list of all constants in the environment.
If you are usingbinary keys or values and need to enter them in the shell, use
double-quote'dhexadecimal representation. For example:
hbase> get 't1',"key\x03\x3f\xcd"
hbase> get 't1',"key\003\023\011"
hbase> put 't1', "test\xef\xff",'f1:', "\x01\x33\x40"
The HBase shell isthe (J)Ruby IRB with the above HBase-specific commands added.
For more on theHBase Shell, see http://hbase.apache.org/docs/current/book.html
Create a tablenamed test with a single column family named cf. verify its creation by listingall tables and then insert some values.
hbase(main):002:0>create 'test','cf'
0 row(s) in 1.2240seconds
hbase(main):003:0>list 'test'
TABLE
test
1 row(s) in 0.0500 seconds hbase(main):004:0> put 'test', 'row1', 'cf:a', 'value1'
0 row(s) in 0.0560 seconds
hbase(main):005:0> put 'test', 'row2', 'cf:b', 'value2'
0 row(s) in 0.0370 seconds
hbase(main):006:0> put 'test', 'row3', 'cf:c', 'value3'
0 row(s) in 0.0450 seconds
Above we inserted 3values, one at a time. The first insert is at row1, column cf:a with a value ofvalue1. Columns in hbase are comprised of a column family prefix cf in thisexample followed by a colon and then a column qualifier suffix (a in thiscase). Verify the data insert by running a scan of the table as follows
Verify the datainsert by running a scan of the table as follows
hbase(main):008:0>scan 'test'
ROW COLUMN+CELL
row1\x0A\x0A column=cf:a,timestamp=1377503568044, value=value1
1 row(s) in 0.0560seconds
Get a single row
hbase(main):015:0>get 'test','row2'
COLUMN CELL
cf:b timestamp=1377503874806, value=value2
1 row(s) in 0.0190seconds
Disable and dropyour table.
hbase(main):017:0>disable 'test'
0 row(s) in 2.0600seconds
hbase(main):018:0>list 'test'
TABLE
test
1 row(s) in 0.0150seconds
hbase(main):019:0>drop 'test'
0 row(s) in 1.1950seconds
hbase(main):020:0>list 'test'
TABLE
0 row(s) in 0.0170seconds
Exit the shell bytyping exit.