Mailing-List: contact user-help@hbase.apache.org; run by ezmlm
Precedence: bulk
Reply-To: user@hbase.apache.org
Received-SPF: pass (nike.apache.org: domain of silvio.digregorio@gmail.com
 designates 209.85.213.176 as permitted sender)
MIME-Version: 1.0
In-Reply-To: 
 <CACcaEW58wV75NPWx+QTLpjOPkYPjUjXMBbxL6CZZtpWWRNhBQA@mail.gmail.com>
References: 
 <CACcaEW6Ufrh1ZWiO8=h_EzAWQ4++saoHjzL3a78J_fHuTzAx3g@mail.gmail.com>
	<CAPQV63UFQisHDf1NMv7OHqYD26qQmwzWnWzzwKSM7uW9npJe_Q@mail.gmail.com>
	<CAEo-6+RZNran5L9f6a3GZ9Xji+yzt7+-zAPwKwTO0FMumKHBRw@mail.gmail.com>
	<CAPQV63WEwD2tyAZPgXHTVzFhtgYj0iqL1d1uNkRAWJymNg7fUA@mail.gmail.com>
	<CACcaEW58wV75NPWx+QTLpjOPkYPjUjXMBbxL6CZZtpWWRNhBQA@mail.gmail.com>
Date: Mon, 13 Apr 2015 14:21:58 +0200
Message-ID: 
 <CACcaEW7ofzFtZ+9da8nj=_SMJEfLBU0n6HF7kvaH+JhzMgvA6Q@mail.gmail.com>
Subject: Re: Job MapReduce to populate HBase Table
From: Silvio Di gregorio <silvio.digregorio@gmail.com>
To: user@hbase.apache.org
Content-Type: multipart/alternative; boundary=001a113eb98a0fc16205139a29f7

--001a113eb98a0fc16205139a29f7
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

the signature of the write method is:
write(ImmutableBytesWritable
<eclipse-javadoc:%E2%98%82=3DLoadUnico/C:%5C/Users%5C/sdigregorio%5C/ws-clo=
udera%5C/JAR%5C/hadoop-mapreduce-client-core-2.0.0-cdh4.0.0.jar%3Corg.apach=
e.hadoop.mapreduce(TaskInputOutputContext.class%E2%98%83TaskInputOutputCont=
ext~write~TKEYOUT;~TVALUEOUT;%E2%98%82org.apache.hadoop.hbase.io.ImmutableB=
ytesWritable>
arg0, Writable
<eclipse-javadoc:%E2%98%82=3DLoadUnico/C:%5C/Users%5C/sdigregorio%5C/ws-clo=
udera%5C/JAR%5C/hadoop-mapreduce-client-core-2.0.0-cdh4.0.0.jar%3Corg.apach=
e.hadoop.mapreduce(TaskInputOutputContext.class%E2%98%83TaskInputOutputCont=
ext~write~TKEYOUT;~TVALUEOUT;%E2%98%82org.apache.hadoop.io.Writable>
arg1)

arg0 don't accept NulWritable.get(), instead "null"

2015-04-13 14:13 GMT+02:00 Silvio Di gregorio <silvio.digregorio@gmail.com>=
:

> in documentation (http://hbase.apache.org/0.94/book/mapreduce.example.htm=
l),
> when the Reduce extends the TableReducer class the write method
> put the key null, or rather NullWritable like Shahab Say.
> However, the error has disappeared when i removed the
> "hbase-client-0.96.0-hadoop1.jar" and inserted  "hbase-0.94.6-cdh4.3.0.ja=
r".
> Sorry but i don't understand, I knew only that the Context object had not
> accepted a PUT where was required WRITABLE with the
> "hbase-client-0.96.0-hadoop1.jar" jar in classpath. With the
> "hbase-0.94.6-cdh4.3.0.jar" it is possible.
>
> 2015-04-13 13:52 GMT+02:00 Jean-Marc Spaggiari <jean-marc@spaggiari.org>:
>
>> Oh, Shahab is write! That's what happend when you write emails before yo=
ur
>> coffee ;) I confused with your "Put" key ;)  Looked to quickly...
>>
>> JM
>>
>> 2015-04-13 7:46 GMT-04:00 Shahab Yunus <shahab.yunus@gmail.com>:
>>
>> > For the null key you should use NullWritable class, as discussed here:
>> >
>> >
>> http://stackoverflow.com/questions/16198752/advantages-of-using-nullwrit=
able-in-hadoop
>> >
>> > Regards,
>> > Shahab
>> >
>> > On Mon, Apr 13, 2015 at 7:01 AM, Jean-Marc Spaggiari <
>> > jean-marc@spaggiari.org> wrote:
>> >
>> > > Hi Silvio,
>> > >
>> > > What is the key you try to write into your HBase table? From your
>> code,
>> > > sound like you want your key to be null for all your values, which i=
s
>> not
>> > > possible in HBase.
>> > >
>> > > JM
>> > >
>> > > 2015-04-13 6:37 GMT-04:00 Silvio Di gregorio <
>> > silvio.digregorio@gmail.com
>> > > >:
>> > >
>> > > > Hi,
>> > > > In Reduce phase when i write to Hbase Table "PFTableNa"
>> > > > context.write(null , put);
>> > > > Eclipse say me:
>> > > > *"The method write(ImmutableBytesWritable, Writable) in the type
>> > > >
>> > >
>> >
>> TaskInputOutputContext<Text,BytesWritable,ImmutableBytesWritable,Writabl=
e>
>> > > > is not applicable for the arguments (null, Put)"*
>> > > >
>> > > > *put *is org
>> > > >
>> > > >
>> > >
>> >
>> <eclipse-javadoc:%E2%98%82=3DLoadUnico/C:%5C/Users%5C/sdigregorio%5C/wor=
kspace-luna%5C/hbase-client-0.96.0-hadoop1.jar%3Corg>
>> > > > .apache
>> > > >
>> > > >
>> > >
>> >
>> <eclipse-javadoc:%E2%98%82=3DLoadUnico/C:%5C/Users%5C/sdigregorio%5C/wor=
kspace-luna%5C/hbase-client-0.96.0-hadoop1.jar%3Corg.apache>
>> > > > .hadoop
>> > > >
>> > > >
>> > >
>> >
>> <eclipse-javadoc:%E2%98%82=3DLoadUnico/C:%5C/Users%5C/sdigregorio%5C/wor=
kspace-luna%5C/hbase-client-0.96.0-hadoop1.jar%3Corg.apache.hadoop>
>> > > > .hbase
>> > > >
>> > > >
>> > >
>> >
>> <eclipse-javadoc:%E2%98%82=3DLoadUnico/C:%5C/Users%5C/sdigregorio%5C/wor=
kspace-luna%5C/hbase-client-0.96.0-hadoop1.jar%3Corg.apache.hadoop.hbase>
>> > > > .client
>> > > >
>> > > >
>> > >
>> >
>> <eclipse-javadoc:%E2%98%82=3DLoadUnico/C:%5C/Users%5C/sdigregorio%5C/wor=
kspace-luna%5C/hbase-client-0.96.0-hadoop1.jar%3Corg.apache.hadoop.hbase.cl=
ient>
>> > > > .Put
>> > > >
>> > > >
>> > >
>> >
>> <eclipse-javadoc:%E2%98%82=3DLoadUnico/C:%5C/Users%5C/sdigregorio%5C/wor=
kspace-luna%5C/hbase-client-0.96.0-hadoop1.jar%3Corg.apache.hadoop.hbase.cl=
ient(Put.class%E2%98%83Put>.Put(byte[]
>> > > > row)
>> > > > byte[] rowkey =3D key.getBytes();
>> > > > Put put =3D new Put(rowkey);
>> > > >
>> > > > the signature of the reduce method:
>> > > > reduce( Text key,Iterable<BytesWritable> values, Context context)
>> > > >
>> > > > and
>> > > >
>> > > > public static class Reduce extends TableReducer<Text, BytesWritabl=
e,
>> > > > ImmutableBytesWritable>{
>> > > >
>> > > > in the main method:
>> > > > Configuration conf =3D HBaseConfiguration.create();
>> > > > Job job =3D new Job(conf, "LetturaFileHDFS2HBase");
>> > > > ...
>> > > > TableMapReduceUtil.initTableReducerJob("PFTableNa", Reduce.class,
>> job);
>> > > >
>> > > > Thanks a lot
>> > > > Silvio
>> > > >
>> > >
>> >
>>
>
>

--001a113eb98a0fc16205139a29f7--