best way to load millions of gzip files in hdfs to one table in hive?

[zuohua zhang <zu...@gmail.com>]

I have millions of gzip files in hdfs (with the same fields), would like to
load them into one table in hive with a specified schema.
What is the most efficient ways to do that?
Given that my data is only in hdfs, and also gzipped, does that mean I
could just simply set up the table somehow bypassing some unnecessary
overhead of the typical approach?

Thanks!

Re: best way to load millions of gzip files in hdfs to one table in hive?

[Abhishek <ab...@gmail.com>]

Hi Edward,

I am kind of interested in this, for crush to work do we need install any thing?? 

How can it be used in a cluster. 

Regards
Abhi

Sent from my iPhone

On Oct 2, 2012, at 5:45 PM, Edward Capriolo <ed...@gmail.com> wrote:

> You may want to use:
> 
> https://github.com/edwardcapriolo/filecrush
> 
> We use this to deal with pathological cases although the best idea is
> to avoid big files all together.
> 
> Edward
> 
> On Tue, Oct 2, 2012 at 4:16 PM, Alexander Pivovarov
> <ap...@gmail.com> wrote:
>> Options
>> 1. create table and put files under the table dir
>> 
>> 2. create external table and point it to files dir
>> 
>> 3. if files are small then I recomend to create new set of files using
>> simple MR program and specifying number of reduce tasks. Goal is to make
>> files size > hdfs block size (it safes NN memory and read will be faster)
>> 
>> 
>> On Tue, Oct 2, 2012 at 3:53 PM, zuohua zhang <zu...@gmail.com> wrote:
>>> 
>>> I have millions of gzip files in hdfs (with the same fields), would like
>>> to load them into one table in hive with a specified schema.
>>> What is the most efficient ways to do that?
>>> Given that my data is only in hdfs, and also gzipped, does that mean I
>>> could just simply set up the table somehow bypassing some unnecessary
>>> overhead of the typical approach?
>>> 
>>> Thanks!
>> 
>> 

Re: best way to load millions of gzip files in hdfs to one table in hive?

[Edward Capriolo <ed...@gmail.com>]

You may want to use:

https://github.com/edwardcapriolo/filecrush

We use this to deal with pathological cases although the best idea is
to avoid big files all together.

Edward

On Tue, Oct 2, 2012 at 4:16 PM, Alexander Pivovarov
<ap...@gmail.com> wrote:
> Options
> 1. create table and put files under the table dir
>
> 2. create external table and point it to files dir
>
> 3. if files are small then I recomend to create new set of files using
> simple MR program and specifying number of reduce tasks. Goal is to make
> files size > hdfs block size (it safes NN memory and read will be faster)
>
>
> On Tue, Oct 2, 2012 at 3:53 PM, zuohua zhang <zu...@gmail.com> wrote:
>>
>> I have millions of gzip files in hdfs (with the same fields), would like
>> to load them into one table in hive with a specified schema.
>> What is the most efficient ways to do that?
>> Given that my data is only in hdfs, and also gzipped, does that mean I
>> could just simply set up the table somehow bypassing some unnecessary
>> overhead of the typical approach?
>>
>> Thanks!
>
>

Re: best way to load millions of gzip files in hdfs to one table in hive?

[Alexander Pivovarov <ap...@gmail.com>]

Options
1. create table and put files under the table dir

2. create external table and point it to files dir

3. if files are small then I recomend to create new set of files using
simple MR program and specifying number of reduce tasks. Goal is to make
files size > hdfs block size (it safes NN memory and read will be faster)


On Tue, Oct 2, 2012 at 3:53 PM, zuohua zhang <zu...@gmail.com> wrote:

> I have millions of gzip files in hdfs (with the same fields), would like
> to load them into one table in hive with a specified schema.
> What is the most efficient ways to do that?
> Given that my data is only in hdfs, and also gzipped, does that mean I
> could just simply set up the table somehow bypassing some unnecessary
> overhead of the typical approach?
>
> Thanks!
>