hbase-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Arun Allamsetty <arun.allamse...@gmail.com>
Subject Re: HBase appends
Date Tue, 22 Jul 2014 19:32:24 GMT
Hi,

Isn't versioning used for an entirely different purpose? What if I screw up
a book name and then have to rewrite it? Then I'll have two versions for
the same book. Also, AFAIK the default number of versions is 1 on table
creation without additional parameters.

Thanks,
Arun
On Jul 22, 2014 12:11 PM, "yonghu" <yongyong313@gmail.com> wrote:

> Hi,
>
> If a author does not have hundreds of publications, you can directly write
> in one column. Hence, your column will contain multiple data versions. The
> default data version is 3 but you can send more.
>
>
> On Tue, Jul 22, 2014 at 4:20 AM, Ishan Chhabra <ichhabra@rocketfuel.com>
> wrote:
>
> > Arun,
> > You need to represent your data in a format such that you can simply add
> a
> > byte[] to the end of the existing byte[] in a Cell and later read and
> > decode it as a list.
> >
> > One way is to use the encode your data as protobuf. When you append a
> list
> > of values in byte[] form in protobuf to an existing list byte[] and read
> > the combined byte[], it is automatically recognized as one single list
> due
> > to the way protobuf encodes lists.
> >
> > 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).
> >
> >
> > On Mon, Jul 21, 2014 at 5:43 PM, Arun Allamsetty <
> > arun.allamsetty@gmail.com>
> > wrote:
> >
> > > 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 just
> append
> > > to it using the HBase Java API *Append* instead of doing a
> > > read-modify-insert on a Java List object containing all the books.
> > >
> > > Thanks,
> > > Arun
> > >
> >
> >
> >
> > --
> > *Ishan Chhabra *| Rocket Scientist | RocketFuel Inc.
> >
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message