Hi Kyle, This will give you all the attributs of the table, not just the coprocessors, so don't forget to parse they key using CP_HTD_ATTR_KEY_PATTERN ...
I will add in my ToDo to add a List<> getCoprocessors() method in HTableInterface or HTableDescriptor... JM 2013/1/23, Kyle Lin <[email protected]>: > Hello JM > > It really works! Thanks a lot. > > Hello Jack > > For each table, it needs to use htable.getTableDescriptor(). > > hbaseAdmin.getTableDescriptor only gets -ROOT- and .META. > > So I use the code as follows, > > HTable htable = new HTable(config, tableName); > HTableDescriptor htableDesc = *htable.getTableDescriptor()*; > Map<ImmutableBytesWritable, ImmutableBytesWritable> maps = > htableDesc.getValues(); > Set<Entry<ImmutableBytesWritable, ImmutableBytesWritable>> sets = > maps.entrySet(); > for (Map.Entry<ImmutableBytesWritable, ImmutableBytesWritable> entrySet : > sets) { > String stringKey = Bytes.toString(entrySet.getKey().get()); > String stringValue = Bytes.toString(entrySet.getValue().get()); > System.out.println("key:" + stringKey + ", value:" + stringValue); > } > htable.close(); > > Kyle > > 2013/1/24 jack <[email protected]> > >> Hi, Kyle >> >> Configuration config = HBaseConfiguration.create(); >> config.set("hbase.zookeeper.quorum", "host3"); >> config.set("hbase.zookeeper.property.clientPort", "2181"); >> >> config.set("fs.default.name", "hdfs://host3:9000"); >> config.set("mapred.job.tracker", "hdfs://host3:9001"); >> >> HBaseAdmin hbaseAdmin = new HBaseAdmin(config); >> >> HTableDescriptor htableDescriptor = >> hbaseAdmin.getTableDescriptor(Bytes.toBytes("table21")); >> >> Map<ImmutableBytesWritable, ImmutableBytesWritable> maps = >> htableDescriptor.getValues(); >> Set<Entry<ImmutableBytesWritable, ImmutableBytesWritable>> sets = >> maps.entrySet(); >> Iterator<Entry<ImmutableBytesWritable, ImmutableBytesWritable>> >> it >> = sets.iterator(); >> while(it.hasNext()){ >> Entry<ImmutableBytesWritable, ImmutableBytesWritable> >> keys = it.next(); >> ImmutableBytesWritable ibwKey = keys.getKey(); >> ImmutableBytesWritable ibwValue = keys.getValue(); >> String stringKey = Bytes.toString(ibwKey.get()); >> String stringValue = Bytes.toString(ibwValue.get()); >> System.out.println(stringKey + " " + stringValue); >> } >> hbaseAdmin.close(); >> >> >> >> >> ________________________________ >> 寄件者： Kyle Lin <[email protected]> >> 收件者： [email protected] >> 寄件日期： 2013/1/23 (週三) 4:18 PM >> 主旨： How to get coprocessor list by client API >> >> Hi, Everyone >> >> I need to know What coprocessors registered in a HTable. But, in >> Class >> HTableDescriptor, I can only find >> *addCoprocessor< >> http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/HTableDescriptor.html#addCoprocessor(java.lang.String) >> > >> *, *hasCoprocessor< >> http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/HTableDescriptor.html#hasCoprocessor(java.lang.String) >> > >> * ..etc. How can I use Client API to get the coprocessor information just >> like Typing "describe table_name" in HBase Shell as follows? >> >> >> hbase(main):002:0> describe 'table21' >> DESCRIPTION >> ENABLED >> {NAME => 'table21', *coprocessor$1 => >> 'hdfs://host3:9000/sumCoprocessor.jar|idv.jack.endpoint true >> * >> * .SumDataEndpoint||'*, FAMILIES => [{NAME => 'cf', DATA_BLOCK_ENCODING >> => >> 'NONE', BLOOMFILTER >> => 'NONE', REPLICATION_SCOPE => '0', VERSIONS => '3', COMPRESSION => >> 'NONE', MIN_VERSIONS => >> '0', TTL => '2147483647', KEEP_DELETED_CELLS => 'false', BLOCKSIZE => >> '65536', IN_MEMORY => >> 'false', ENCODE_ON_DISK => 'true', BLOCKCACHE => 'true'}]} >> >> 1 row(s) in 0.0210 seconds >> >> Kyle >> >
