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Date: Thu, 24 Jan 2013 11:53:22 +0800
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 <CAP4=KSPBrzyKsGg_=bPG_7MWb4m+dq0PG4awWM4Q24Xq=bsKWA@mail.gmail.com>
Subject: Re: How to get coprocessor list by client API
From: Kyle Lin <kylelin2000@gmail.com>
To: user@hbase.apache.org
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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 =3D new HTable(config, tableName);
HTableDescriptor htableDesc =3D *htable.getTableDescriptor()*;
Map<ImmutableBytesWritable, ImmutableBytesWritable> maps =3D
htableDesc.getValues();
Set<Entry<ImmutableBytesWritable, ImmutableBytesWritable>> sets =3D
maps.entrySet();
for (Map.Entry<ImmutableBytesWritable, ImmutableBytesWritable> entrySet :
sets) {
String stringKey =3D Bytes.toString(entrySet.getKey().get());
String stringValue =3D Bytes.toString(entrySet.getValue().get());
System.out.println("key:" + stringKey + ", value:" + stringValue);
}
htable.close();

Kyle

2013/1/24 jack <ky73551@yahoo.com.tw>

> Hi, Kyle
>
>         Configuration config =3D 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 =3D new HBaseAdmin(config);
>
>         HTableDescriptor htableDescriptor =3D
> hbaseAdmin.getTableDescriptor(Bytes.toBytes("table21"));
>
>         Map<ImmutableBytesWritable, ImmutableBytesWritable> maps =3D
> htableDescriptor.getValues();
>         Set<Entry<ImmutableBytesWritable, ImmutableBytesWritable>> sets =
=3D
> maps.entrySet();
>         Iterator<Entry<ImmutableBytesWritable, ImmutableBytesWritable>> i=
t
> =3D sets.iterator();
>         while(it.hasNext()){
>                 Entry<ImmutableBytesWritable, ImmutableBytesWritable>
> keys =3D it.next();
>                 ImmutableBytesWritable ibwKey =3D keys.getKey();
>                 ImmutableBytesWritable ibwValue =3D keys.getValue();
>                 String stringKey =3D Bytes.toString(ibwKey.get());
>                 String stringValue =3D Bytes.toString(ibwValue.get());
>                 System.out.println(stringKey + "    " + stringValue);
>         }
>         hbaseAdmin.close();
>
>
>
>
> ________________________________
>  =B1H=A5=F3=AA=CC=A1G Kyle Lin <kylelin2000@gmail.com>
> =A6=AC=A5=F3=AA=CC=A1G user@hbase.apache.org
> =B1H=A5=F3=A4=E9=B4=C1=A1G 2013/1/23 (=B6g=A4T) 4:18 PM
> =A5D=A6=AE=A1G How to get coprocessor list by client API
>
> Hi, Everyone
>
>     I need to know What coprocessors registered in a HTable. But, in Clas=
s
> 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 =3D> 'table21', *coprocessor$1 =3D>
> 'hdfs://host3:9000/sumCoprocessor.jar|idv.jack.endpoint true
>                                *
> * .SumDataEndpoint||'*, FAMILIES =3D> [{NAME =3D> 'cf', DATA_BLOCK_ENCODI=
NG =3D>
> 'NONE', BLOOMFILTER
> =3D> 'NONE', REPLICATION_SCOPE =3D> '0', VERSIONS =3D> '3', COMPRESSION =
=3D>
> 'NONE', MIN_VERSIONS =3D>
>   '0', TTL =3D> '2147483647', KEEP_DELETED_CELLS =3D> 'false', BLOCKSIZE =
=3D>
> '65536', IN_MEMORY =3D>
>   'false', ENCODE_ON_DISK =3D> 'true', BLOCKCACHE =3D> 'true'}]}
>
> 1 row(s) in 0.0210 seconds
>
> Kyle
>

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