이곳에는 간단한 HBase 명령어 실행과 RegionSplitter 사용을 본다.
동영상 제작해서 만들어 업로드기까지는 시간이 엄청나게 걸리는 작업인 걸 이번에 알았다.........
[hadoop@h001 hbase]$ ./bin/hbase shell
HBase Shell; enter 'help<RETURN>' for list of supported commands.
Type "exit<RETURN>" to leave the HBase Shell
Version 0.94.7, r1471806, Wed Apr 24 18:48:26 PDT 2013
hbase(main):001:0> help
HBase Shell, version 0.94.7, r1471806, Wed Apr 24 18:48:26 PDT 2013
Type 'help "COMMAND"', (e.g. 'help "get"' -- the quotes are necessary) for help on a specific command.
Commands are grouped. Type 'help "COMMAND_GROUP"', (e.g. 'help "general"') for help on a command 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, truncate
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, remove_peer, start_replication, stop_replication
Group name: snapshot
Commands: clone_snapshot, delete_snapshot, list_snapshots, restore_snapshot, snapshot
Group name: security
Commands: grant, revoke, user_permission
SHELL USAGE:
Quote all names in HBase Shell such as table and column names. Commas delimit
command parameters. Type <RETURN> after entering a command to run it.
Dictionaries of configuration used in the creation and alteration of tables are
Ruby Hashes. They look like this:
{'key1' => 'value1', 'key2' => 'value2', ...}
and are opened and closed with curley-braces. Key/values are delimited by the
'=>' character combination. Usually keys are predefined constants such as
NAME, VERSIONS, COMPRESSION, etc. Constants do not need to be quoted. Type
'Object.constants' to see a (messy) list of all constants in the environment.
If you are using binary keys or values and need to enter them in the shell, use
double-quote'd hexadecimal 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 is the (J)Ruby IRB with the above HBase-specific commands added.
For more on the HBase Shell, see http://hbase.apache.org/docs/current/book.html
hbase(main):002:0> help 'create'
hbase(main):039:0> create 'ta1', 'cf1'
$ ./bin/hbase shellhbase(main):035:0> describe 'ta1'
$ ./bin/hbase shellDESCRIPTION ENABLED
'ta1', {NAME => 'cf1', DATA_BLOCK_ENCODING => 'NONE false
', BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0',
VERSIONS => '3', COMPRESSION => 'NONE', MIN_VERSIO
NS => '0', TTL => '2147483647', KEEP_DELETED_CELLS
=> 'false', BLOCKSIZE => '65536', IN_MEMORY => 'fal
se', ENCODE_ON_DISK => 'true', BLOCKCACHE => 'true'
}
1 row(s) in 0.0660 seconds
hbase(main):039:0> disable 'ta1'
hbase(main):036:0> is_enabled 'ta1'
false
0 row(s) in 0.0160 seconds
hbase(main):037:0> enable 'ta1'
0 row(s) in 2.1680 seconds
hbase(main):038:0> is_enabled 'ta1'
true
0 row(s) in 0.0170 seconds
hbase(main):044:0> drop 'ta1'
ERROR: Table ta1 is enabled. Disable it first.'
Here is some help for this command:
Drop the named table. Table must first be disabled: e.g. "hbase> drop 't1'"
hbase(main):045:0> disable 'ta1'
0 row(s) in 2.1170 seconds
hbase(main):046:0> drop 'ta1'
0 row(s) in 1.1630 seconds
==> drop 시 hdfs 에 생성되어 있던 /hbase/ta1 디렉토리가 삭제 처리됨
hbase(main):047:0> list
TABLE
hbase009
regionsplit_table
test
textxx
4 row(s) in 0.0570 seconds
hbase(main):048:0> create 'table01', 'cf'
hbase(main):049:0> put 'table01', 'row001', 'cf:a', 'value i wanna put'
hbase(main):050:0> put 'table01', 'row001', 'cf:b', 'value b i wanna put'
hbase(main):051:0> put 'table01', 'row001', 'cf:c', 'value c i wanna put'
hbase(main):052:0> put 'table01', 'row002', 'cf:2a', 'value 2a i wanna put'
hbase(main):053:0> put 'table01', 'row003', 'cf:3a', 'value 3a i wanna put'
hbase(main):054:0> scan 'table01'
hbase(main):054:0> scan 'table01'
hbase(main):067:0> get 'table01', 'row001'
hbase(main):068:0> get 'table01', 'row001', 'cf:a'
hbase(main):070:0> get 'table01', 'row001', 'cf:a', 'cf:b'
hbase(main):071:0> get 'table01', 'row001', ['cf:a', 'cf:b']
hbase(main):071:0> get 'table01', 'row001', ['cf:a', 'cf:b']
hbase(main):074:0> scan 'table01'
ROW COLUMN+CELL
row001 column=cf:a, timestamp=1372602441690, value=value i wanna put
row001 column=cf:b, timestamp=1372602450824, value=value b i wanna put
row001 column=cf:c, timestamp=1372602456583, value=value c i wanna put
row002 column=cf:2a, timestamp=1372602470758, value=value 2a i wanna put
row003 column=cf:3a, timestamp=1372602481567, value=value 3a i wanna put
3 row(s) in 0.0630 seconds
hbase(main):075:0> import java.util.Date
=> Java::JavaUtil::Date
hbase(main):076:0> Date.new(1372602456583).toString()
=> "Sun Jun 30 23:27:36 KST 2013"
$ hbase org.apache.hadoop.hbase.util.RegionSplittertest_table HexStringSplit -c 3 -f f1
cf.
[hadoop@h001 hbase]$ ps auxk -rss|less
[refered to http://hortonworks.com/blog/apache-hbase-region-splitting-and-merging/]
[refered to this HBase book below]
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