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https://issues.apache.org/jira/browse/HBASE-9549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Nick Dimiduk updated HBASE-9549:
--------------------------------
Release Note:
HBase supports addressing cells with an empty column qualifier, but not all
edge services handle that scenario correctly. In some case, attempting to
address a cell at [rowkey, fam, ] results in interaction with the entire column
family.
Users of the shell, MapReduce, REST, and Thrift who wish to interact with an
entire column family must use "family" instead of "family:" (notice the omitted
':'). Including the ':' will be interpreted as an interaction with the empty
qualifier in the "family" column family.
> KeyValue#parseColumn(byte[]) does not handle empty qualifier
> ------------------------------------------------------------
>
> Key: HBASE-9549
> URL: https://issues.apache.org/jira/browse/HBASE-9549
> Project: HBase
> Issue Type: Bug
> Components: mapreduce, REST, Thrift, util
> Affects Versions: 0.95.2
> Reporter: Nick Dimiduk
> Assignee: Nick Dimiduk
> Priority: Minor
> Fix For: 0.98.0, 0.96.1
>
> Attachments: HBASE-9549.00.patch, HBASE-9549.01.patch,
> HBASE-9549.02.patch
>
>
> HTable allows a user to interact directly with a KeyValue with an empty
> qualifier, yet {{KeyValue#parseColumn(byte[])}} treats this as a reference to
> a column family. No qualifier delimiter and an empty qualifier are treated as
> the same:
> {code}
> if (index == -1) {
> // If no delimiter, return array of size 1
> return new byte [][] { c };
> } else if(index == c.length - 1) {
> // Only a family, return array size 1
> byte [] family = new byte[c.length-1];
> System.arraycopy(c, 0, family, 0, family.length);
> return new byte [][] { family };
> }
> ...
> {code}
> This inconsistency breaks external interfaces which depend on
> {{parseColumn}}, for instance, the shell:
> {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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