hive-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Mich Talebzadeh <mich.talebza...@gmail.com>
Subject Re: Hive and Impala
Date Wed, 02 Mar 2016 15:30:34 GMT
SQL plays an increasing important role on Hadoop. As of today Hive IMO
provides the best and most robust solution to anything resembling to Data
Warehouse "solution" on Hadoop, chiefly by means of its powerful metastore
which can be hosted on a variety of mission critical databases plus Hive's
ever increasing support for a variety of file types on HDFs from humble
textfile to ORC. The remaining tools are little more than query tools that
crucially rely on Hive Metastore for their needs. Take away Hive component
and they are more and less lame ducks.

Hive on MR speed was perceived to be slow but what the hec we are talking
about a Data Warehouse here which in most part should be batch oriented
and not user-facing and batch oriented. In Hive 0.14 and 2.0 you can use
Spark and Tez as the execution engine and if you are well into functional
programming, you can deploy Spark on Hive. If you look around from Impala
to Spark the architecture is essentially a query tool.



Dr Mich Talebzadeh



LinkedIn * https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw
<https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw>*



http://talebzadehmich.wordpress.com



On 2 March 2016 at 13:52, Dayong <willddy@gmail.com> wrote:

> As I remember of few weeks before in Hadoop weekly news feed, cloudera has
> a benchmark showing implala is a little better than spark SQL and hive with
> tez. You can check that. From my experience, hive is still leading tool for
> regular ETL job since it is stable. The other tool are better for adhoc and
> interactive query use case. Cloudera bet on implala especially with its new
> kudo project.
>
> Thanks,
> Dayong
>
> On Mar 1, 2016, at 5:14 PM, Edward Capriolo <edlinuxguru@gmail.com> wrote:
>
> My nocks on impala. (not intended to be a post knocking impala)
>
> Impala really has not delivered on the complex types that hive has (after
> promising it for quite a while), also it only works with the 'blessed'
> input formats, parquet, avro, text.
>
> It is very annoying to work with impala, In my version if you create a
> partition in hive impala does not see it. You have to run "refresh".
>
> In impala I do not have all the UDFS that hive has like percentile, etc.
>
> Impala is fast. Many data-analysts / data-scientist types that can't wait
> 10 seconds for a query so when I need top produce something for them I make
> sure the data has no complex types and uses a table type that impala
> understands.
>
> But for my work I still work primarily in hive, because I do not want to
> deal with all the things that impala does not have/might have/ and when I
> need something special like my own UDFs it is easier to whip up the
> solution in hive.
>
> Having worked with M$ SQL server, and vertica, Impala is on par with them
> but I don'think of it like i think of hive. To me it just feels like a
> vertica that I can cheat loading sometimes because it is backed by hdfs.
>
> Hive is something different, I am making pipelines, I am transforming
> data, doing streaming, writing custom udfs, querying JSON directly. Its not
> != impala.
>
> ::random message of the day::
>
>
>
>
> On Tue, Mar 1, 2016 at 4:38 PM, Ashok Kumar <ashok34668@yahoo.com> wrote:
>
>>
>> Dr Mitch,
>>
>> My two cents here.
>>
>> I don't have direct experience of Impala but in my humble opinion I share
>> your views that Hive provides the best metastore of all Big Data systems.
>> Looking around almost every product in one form and shape use Hive code
>> somewhere. My colleagues inform me that Hive is one of the most stable Big
>> Data products.
>>
>> With the capabilities of Spark on Hive and Hive on Spark or Tez plus of
>> course MR, there is really little need for many other products in the same
>> space. It is good to keep things simple.
>>
>> Warmest
>>
>>
>> On Tuesday, 1 March 2016, 11:33, Mich Talebzadeh <
>> mich.talebzadeh@gmail.com> wrote:
>>
>>
>> I have not heard of Impala anymore. I saw an article in LinkedIn titled
>>
>> "Apache Hive Or Cloudera Impala? What is Best for me?"
>>
>> "We can access all objects from Hive data warehouse with HiveQL which
>> leverages the map-reduce architecture in background for data retrieval and
>> transformation and this results in latency."
>>
>> My response was
>>
>> This statement is no longer valid as you have choices of three engines
>> now with MR, Spark and Tez. I have not used Impala myself as I don't think
>> there is a need for it with Hive on Spark or Spark using Hive metastore
>> providing whatever needed. Hive is for Data Warehouse and provides what is
>> says on the tin. Please also bear in mind that Hive offers ORC storage
>> files that provide store Index capabilities further optimizing the queries
>> with additional stats at file, stripe and row group levels.
>>
>> Anyway the question is with Hive on Spark or Spark using Hive metastore
>> what we cannot achieve that we can achieve with Impala?
>>
>>
>> Dr Mich Talebzadeh
>>
>> LinkedIn * https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw
>> <https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw>*
>>
>> http://talebzadehmich.wordpress.com
>>
>>
>>
>>
>

Mime
View raw message