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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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Jean-Marc Spaggiari 2013-01-28, 12:32
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Re: How to get coprocessor list by client API
Kyle Lin 2013-01-29, 06:39
Hello JM

    If I import 0.94.4 jar file on Client side for calling getCoprocessors
to get list from server of old version(0.94.0), Is it possible?

Kyle

2013/1/28 Jean-Marc Spaggiari <[EMAIL PROTECTED]>

> 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
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Jean-Marc Spaggiari 2013-01-29, 20:25
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Jean-Marc Spaggiari 2013-01-23, 12:39