hbase ERROR: wrong number of arguments (3 for 4)

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在尝试使用HBase的get_counter命令时，遇到错误提示'ERROR: wrong number of arguments (3 for 4)'。通过查看帮助文档，发现get_counter命令需要4个参数。正确执行该命令的方法是在末尾添加'dummy'作为第四个参数，例如：get_counter 'ddl', 'example', 'info:age', 'dummy'。执行后成功获取计数器值。" 51040034,4997083,Android回调机制详解,"['Android开发', '事件处理', '回调函数']

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hbase(main):036:0> get 'ddl', 'example', 'info:age'
COLUMN CELL
info:age timestamp=1436787562408, value=\x00\x00\x00\x00\x00\x00\x00\x03
1 row(s) in 0.0160 seconds

hbase(main):037:0> get_counter 'ddl', 'example', 'info:age'

ERROR: wrong number of arguments (3 for 4)

Here is some help for this command:
Return a counter cell value at specified table/row/column coordinates.
A cell cell should be managed with atomic increment function oh HBase
and the data should be binary encoded. Example:

hbase> get_counter 'ns1:t1', 'r1', 'c1'
hbase> get_counter 't1', 'r1', 'c1'

The same commands also can be run on a table reference. Suppose you had a reference
t to table 't1', the corresponding command would be:

hbase> t.get_counter 'r1', 'c1'

hbase(main):041:0> get_counter 'ddl', 'example', 'info:age', 'dummy' <----加上dummy就对了
COUNTER VALUE = 3

hbase(main):042:0> get 'ddl', 'example', 'info:age'
COLUMN CELL
info:age timestamp=1436787562408, value=\x00\x00\x00\x00\x00\x00\x00\x03
1 row(s) in 0.0210 seconds

hbase(main):043:0> truncate 'ddl'
Truncating 'ddl' table (it may take a while):
- Disabling table...
- Dropping table...
- Creating table...
0 row(s) in 2.6630 seconds

hbase(main):044:0>