Question

我几天前曾在Hadoop 2.5上安装了Hbase 1.0.1 我的问题是Get命令不会返回任何行。我尝试使用不同的表，通过shell或API ...而没有

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hbase(main):020:0> get 'teste', 'camp:name'
COLUMN                   CELL                                                               
0 row(s) in 0.0930 seconds

hbase(main):021:0> scan 'teste'
ROW                      COLUMN+CELL                                                        
 1                       column=camp:nume, timestamp=1431128619811, value=David             
1 row(s) in 0.1720 seconds

Answer 1

那是因为你错过了行键，它认为你正在获得不存在的'camp：nume'行。

使用它来获取第1行的所有列：

hbase(main):020:0> get 'teste', '1'

使用它来获取第1行的'camp：nume'列：

hbase(main):020:0> get 'teste', '1', 'camp:nume'

仅供参考，在HBase Shell中，您可以运行一个没有参数的简单命令来查看帮助：

hbase(main):005:0> get

ERROR: wrong number of arguments (0 for 2)

Here is some help for this command:
Get row or cell contents; pass table name, row, and optionally
a dictionary of column(s), timestamp, timerange and versions. Examples:

  hbase> get 't1', 'r1'
  hbase> get 't1', 'r1', {TIMERANGE => [ts1, ts2]}
  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', TIMERANGE => [ts1, ts2], VERSIONS => 4}
  hbase> get 't1', 'r1', {COLUMN => 'c1', TIMESTAMP => ts1, VERSIONS => 4}
  hbase> get 't1', 'r1', 'c1'
  hbase> get 't1', 'r1', 'c1', 'c2'
  hbase> get 't1', 'r1', ['c1', 'c2']

The same commands also can be run on a reference to a table (obtained via get_table or
 create_table). Suppose you had a reference t to table 't1', the corresponding commands would be:

  hbase> t.get 'r1'
  hbase> t.get 'r1', {TIMERANGE => [ts1, ts2]}
  hbase> t.get 'r1', {COLUMN => 'c1'}
  hbase> t.get 'r1', {COLUMN => ['c1', 'c2', 'c3']}
  hbase> t.get 'r1', {COLUMN => 'c1', TIMESTAMP => ts1}
  hbase> t.get 'r1', {COLUMN => 'c1', TIMERANGE => [ts1, ts2], VERSIONS => 4}
  hbase> t.get 'r1', {COLUMN => 'c1', TIMESTAMP => ts1, VERSIONS => 4}
  hbase> t.get 'r1', 'c1'
  hbase> t.get 'r1', 'c1', 'c2'
  hbase> t.get 'r1', ['c1', 'c2']

Hbase GET命令不断返回0行

1 个答案: