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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9549) shell get command does not distinguish between family scan and empty qualifier
Date Mon, 16 Sep 2013 21:41:55 GMT
Nick Dimiduk created HBASE-9549:
-----------------------------------

             Summary: shell get command does not distinguish between family scan and empty
qualifier
                 Key: HBASE-9549
                 URL: https://issues.apache.org/jira/browse/HBASE-9549
             Project: HBase
          Issue Type: Bug
          Components: shell
            Reporter: Nick Dimiduk
            Assignee: Nick Dimiduk
            Priority: Minor


The shell is commonly used as a simple way to validate assumptions about the hbase data model.
In this particular case, the shell behaves slightly differently from the HTable interface.

{noformat}

# shell interactions with KV with an empty qualifier

hbase(main):001:0> create 'foo', 'f1'
0 row(s) in 1.4130 seconds

=> Hbase::Table - foo
hbase(main):002:0> put 'foo', 'rk1', 'f1:', 'empty?'
0 row(s) in 0.0750 seconds # <= put works

hbase(main):003:0> put 'foo', 'rk1', 'f1:bar', 'value'
0 row(s) in 0.0070 seconds

# attempt to retrieve just the kv with empty qualifier

hbase(main):004:0> get 'foo', 'rk1', 'f1:'
COLUMN                                              CELL
 f1:                                                timestamp=1379363480020, value=empty?
 f1:bar                                             timestamp=1379363546360, value=value
2 row(s) in 0.0360 seconds # <= returns more than expected!

hbase(main):005:0> get 'foo', 'rk1', 'f1'
COLUMN                                              CELL
 f1:                                                timestamp=1379363480020, value=empty?
 f1:bar                                             timestamp=1379363546360, value=value
2 row(s) in 0.0120 seconds

hbase(main):006:0> delete 'foo', 'rk1', 'f1:'
0 row(s) in 0.0290 seconds # <= delete works

hbase(main):007:0> get 'foo', 'rk1', 'f1:'
COLUMN                                              CELL
 f1:bar                                             timestamp=1379363546360, value=value
1 row(s) in 0.0260 seconds

hbase(main):008:0> get 'foo', 'rk1', 'f1'
COLUMN                                              CELL
 f1:bar                                             timestamp=1379363546360, value=value
1 row(s) in 0.0080 seconds

# restore the empty qual kv for HTable test

hbase(main):011:0> put 'foo', 'rk1', 'f1:', 'empty?'
0 row(s) in 0.0950 seconds

hbase(main):010:0> get 'foo', 'rk1', 'f1:'
COLUMN                                              CELL
 f1:                                                timestamp=1379365262555, value=empty?
 f1:bar                                             timestamp=1379365134135, value=value
2 row(s) in 0.0290 seconds

hbase(main):011:0> get 'foo', 'rk1', 'f1'
COLUMN                                              CELL
 f1:                                                timestamp=1379365262555, value=empty?
 f1:bar                                             timestamp=1379365134135, value=value
2 row(s) in 0.0080 seconds

hbase(main):012:0> hconf = org.apache.hadoop.hbase.HBaseConfiguration.create()
=> #<Java::OrgApacheHadoopConf::Configuration:0x208e2fb5>
hbase(main):013:0> t = org.apache.hadoop.hbase.client.HTable.new(hconf,'foo')
=> #<Java::OrgApacheHadoopHbaseClient::HTable:0x437d51a6>

# create a Get requesting the empty qualifier only, works

hbase(main):014:0> g1 = org.apache.hadoop.hbase.client.Get.new(org.apache.hadoop.hbase.util.Bytes.toBytes('rk1'))
=> #<Java::OrgApacheHadoopHbaseClient::Get:0x796523ab>
hbase(main):015:0> g1.addColumn(org.apache.hadoop.hbase.util.Bytes.toBytes('f1'), nil)
=> #<Java::OrgApacheHadoopHbaseClient::Get:0x796523ab>
hbase(main):016:0> t.get(g1).toString()
=> "keyvalues={rk1/f1:/1379365262555/Put/vlen=6/mvcc=0}"

# create a Get requesting the whole family, works

hbase(main):017:0> g2 = org.apache.hadoop.hbase.client.Get.new(org.apache.hadoop.hbase.util.Bytes.toBytes('rk1'))
=> #<Java::OrgApacheHadoopHbaseClient::Get:0x52e5376a>
hbase(main):018:0> g2.addFamily(org.apache.hadoop.hbase.util.Bytes.toBytes('f1'))
=> #<Java::OrgApacheHadoopHbaseClient::Get:0x52e5376a>
hbase(main):019:0> t.get(g2).toString()
=> "keyvalues={rk1/f1:/1379365262555/Put/vlen=6/mvcc=0, rk1/f1:bar/1379365134135/Put/vlen=5/mvcc=0}"
{noformat}

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