Hbase 的 官方指令介绍
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hbase(main):001:0> help
HBASE SHELL COMMANDS:
alter Alter column family schema; pass table name and a dictionary
specifying new column family schema. Dictionaries are described
below in the GENERAL NOTES section. Dictionary must include name
of column family to alter. For example,
To change or add the 'f1' column family in table 't1' from defaults
to instead keep a maximum of 5 cell VERSIONS, do:
hbase> alter 't1', {NAME => 'f1', VERSIONS => 5}
To delete the 'f1' column family in table 't1', do:
hbase> alter 't1', {NAME => 'f1', METHOD => 'delete'}
You can also change table-scope attributes like MAX_FILESIZE
MEMSTORE_FLUSHSIZE and READONLY.
For example, to change the max size of a family to 128MB, do:
hbase> alter 't1', {METHOD => 'table_att', MAX_FILESIZE => '134217728'}
count Count the number of rows in a table. This operation may take a LONG
time (Run '$HADOOP_HOME/bin/hadoop jar hbase.jar rowcount' to run a
counting mapreduce job). Current count is shown every 1000 rows by
default. Count interval may be optionally specified. Examples:
hbase> count 't1'
hbase> count 't1', 100000
create Create table; pass table name, a dictionary of specifications per
column family, and optionally a dictionary of table configuration.
Dictionaries are described below in the GENERAL NOTES section.
Examples:
hbase> create 't1', {NAME => 'f1', VERSIONS => 5}
hbase> create 't1', {NAME => 'f1'}, {NAME => 'f2'}, {NAME => 'f3'}
hbase> # The above in shorthand would be the following:
hbase> create 't1', 'f1', 'f2', 'f3'
hbase> create 't1', {NAME => 'f1', VERSIONS => 1, TTL => 2592000, \
BLOCKCACHE => true}
describe Describe the named table: e.g. "hbase> describe 't1'"
delete Put a delete cell value at specified table/row/column and optionally
timestamp coordinates. Deletes must match the deleted cell's
coordinates exactly. When scanning, a delete cell suppresses older
versions. Takes arguments like the 'put' command described below
deleteall Delete all cells in a given row; pass a table name, row, and optionally
a column and timestamp
disable Disable the named table: e.g. "hbase> disable 't1'"
drop Drop the named table. Table must first be disabled. If table has
more than one region, run a major compaction on .META.:
hbase> major_compact ".META."
enable Enable the named table
exists Does the named table exist? e.g. "hbase> exists 't1'"
exit Type "hbase> exit" to leave the HBase Shell
get Get row or cell contents; pass table name, row, and optionally
a dictionary of column(s), timestamp and versions. Examples:
hbase> get 't1', 'r1'
hbase> get 't1', 'r1', {COLUMN => 'c1'}
hbase> get 't1', 'r1', {COLUMN => ['c1', 'c2', 'c3']}
hbase> get 't1', 'r1', {COLUMN => 'c1', TIMESTAMP => ts1}
hbase> get 't1', 'r1', {COLUMN => 'c1', TIMESTAMP => ts1, \
VERSIONS => 4}
list List all tables in hbase
put Put a cell 'value' at specified table/row/column and optionally
timestamp coordinates. To put a cell value into table 't1' at
row 'r1' under column 'c1' marked with the time 'ts1', do:
hbase> put 't1', 'r1', 'c1', 'value', ts1
tools Listing of hbase surgery tools
scan Scan a table; pass table name and optionally a dictionary of scanner
specifications. Scanner specifications may include one or more of
the following: LIMIT, STARTROW, STOPROW, TIMESTAMP, or COLUMNS. If
no columns are specified, all columns will be scanned. To scan all
members of a column family, leave the qualifier empty as in
'col_family:'. Examples:
hbase> scan '.META.'
hbase> scan '.META.', {COLUMNS => 'info:regioninfo'}
hbase> scan 't1', {COLUMNS => ['c1', 'c2'], LIMIT => 10, \
STARTROW => 'xyz'}
For experts, there is an additional option -- CACHE_BLOCKS -- which
switches block caching for the scanner on (true) or off (false). By
default it is enabled. Examples:
hbase> scan 't1', {COLUMNS => ['c1', 'c2'], CACHE_BLOCKS => false}
status Show cluster status. Can be 'summary', 'simple', or 'detailed'. The
default is 'summary'. Examples:
hbase> status
hbase> status 'simple'
hbase> status 'summary'
hbase> status 'detailed'
shutdown Shut down the cluster.
truncate Disables, drops and recreates the specified table.
version Output this HBase version
GENERAL NOTES:
Quote all names in the hbase shell such as table and column names. Don't
forget 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', ...}
They 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.
In case you are using binary keys or values and need to enter them into the
shell then use double-quotes to make use of hexadecimal or octal notations,
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"
Using the double-quote notation you can directly use the values output by the
shell for example during a "scan" call.
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