And please also tell is the versions of Hadoop and HBase you are using,
because HTablePool is deprecated in the newer versions of HBase.
Thanks,
Arun
Sent from a mobile device. Please don't mind the typos.
On Aug 7, 2014 1:16 AM, "Dai, Kevin" wrote:
> Hi, all
>
> I am doing unit testing with HB
Hi Ming,
The reason why we have it is because the user can decide where each key
goes. I can think multiple scenarios off the top of my head where it would
be useful and others can correct me if I am wrong.
1. Cases where you cannot have row keys which are equally lexically
distributed, leading i
Hi,
The @Override annotation worked because, without it the reduce method in
the superclass (Reducer) was being invoked, which basically writes the
input from the mapper class to the context object. Try to look up the
source code for the Reducer class online and you'll realize that.
Hope that cle
Hi Jianshi,
Do you mean that you want to sort the row keys? If yes, then you don't have
to worry about it because HBase sorts the row keys on its own but
lexicographically.
Cheers,
Arun
Sent from a mobile device. Please don't mind the typos.
On Jul 30, 2014 9:02 PM, "Jianshi Huang" wrote:
> I
Hi Parkirat,
I don't think that HBase is causing the problems. You might already know
this but need to add the reducer class to the job as you add the mapper.
Also, if you want to read from a HBase table in a MapReduce job, you need
to implement the TableMapper for the mapper and if you want to wr
Hi Varun,
I am still learning HBase here, so the experts can point out the mistakes I
make. Your problem seems to be something which can be easily mapped to a
HBase table structure.
Firstly, never ever store references in HBase. It doesn't serve any purpose
and will just make your queries slower.
bine when reading
>
> The combining process applies to the multi-version approach as well.
>
> Cheers
>
>
> On Tue, Jul 22, 2014 at 12:32 PM, Arun Allamsetty <
> arun.allamse...@gmail.com
> > wrote:
>
> > Hi,
> >
> > Isn't versioning used for a
gt;
> > Another way to solve this problem is write a new column for each appended
> > list and read all the columns and combine when reading. (I prefer this
> > approach since the way Append is implemented internally, it can lead to
> > high memstore usage).
> >
&
Hi,
If I have a one-to-many relationship in a SQL database (an author might
have written many books), and I want to denormalize it for writing in
HBase, I'll have a table with the Author as the row key and a *list* of
books as values.
Now my question is how do I create a *list* such that I could
Hi,
I have an idea which might be just bulloni, but people learn from mistakes
and this is my attempt to learn. So if I properly understand user use case,
you want to get the first 500 records pertaining to a file based on its
file name. Since you want to limit the number of records written, I won
Hi,
People who are more experienced than I am, correct me if I am wrong, but I
am positive that we can export snapshots to local FS. I did exactly that
today and it's just a hadoop get command once we have the snapshots on
HDFS. Though when I directly tried to export them to local FS it failed
wit
cluster to a distributed one, unless
> I'm mistaken, you should have no problem doing so. HDFS is quite good with
> scaling, whether it's from 10 machines to 20 or 1 to 10 and I don't know of
> any reason that HBase would cause any problems in this regard.
>
> -Dima
>
t using such a setup for any production
> use.
>
> -Dima
>
>
> On Mon, Jul 7, 2014 at 4:25 PM, Arun Allamsetty >
> wrote:
>
> > Hi Ted,
> >
> > I have. So the book says there are two types of distributed modes. One is
> > pseudo distributed, which is
t; Cheers
>
>
> On Mon, Jul 7, 2014 at 3:55 PM, Arun Allamsetty >
> wrote:
>
> > Hi all,
> >
> > So this question might be stupid, retarded even, but it has been bugging
> me
> > for a while and I cannot think of a better place to ask this. I am really
> &
Hi all,
So this question might be stupid, retarded even, but it has been bugging me
for a while and I cannot think of a better place to ask this. I am really
impressed with the way HBase works (as a key-value store). Since it stores
everything as a byte array, I find it really convenient to store
>
> Cheers
>
>
> On Thu, Jul 3, 2014 at 9:14 AM, Arun Allamsetty >
> wrote:
>
> > Hi,
> >
> > I am trying to write a chained MapReduce job on data present in HBase
> > tables and need some help with the concept. I am not expecting people to
>
Hi,
I am trying to write a chained MapReduce job on data present in HBase
tables and need some help with the concept. I am not expecting people to
provide code by pseudo code for this based on HBase's Java API would be
nice.
In a nutshell, what I am trying to do is,
MapReduce Job 1: Read data fr
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