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HBase, mail # user - How to get coprocessor list by client API


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Kyle Lin 2013-01-23, 08:18
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jack 2013-01-24, 01:44
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Kyle Lin 2013-01-24, 03:53
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Jean-Marc Spaggiari 2013-01-24, 12:12
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Kyle Lin 2013-01-28, 09:05
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Re: How to get coprocessor list by client API
Jean-Marc Spaggiari 2013-01-28, 12:32
Hi Kyle,

If you are not running a production cluster, you might think about
getting the last 0.94.4 source code, apply HBASE-7654 and deploy it.
That way you can use getCoprocessors which will send you the list you
the list you are looking for...

JM

2013/1/28, Kyle Lin <[EMAIL PROTECTED]>:
> Hi JM
>
>      I saw the source code of hasCoprocessor, and notice this CONTANT.
> Thanks for your hint.
>
> Kyle
>
> 2013/1/24 Jean-Marc Spaggiari <[EMAIL PROTECTED]>
>
>> 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
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Kyle Lin 2013-01-29, 06:39
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Jean-Marc Spaggiari 2013-01-29, 20:25
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Jean-Marc Spaggiari 2013-01-23, 12:39