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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: Spark on Kudu
Date Sun, 10 Apr 2016 19:23:35 GMT
Yup, starting to get a good idea.

What are your DS folks looking for in terms of functionality related to
Spark? A SparkSQL integration that's as fully featured as Impala's? Do they
care being able to insert into Kudu with SparkSQL or just being able to
query real fast? Anything more specific to Spark that I'm missing?

FWIW the plan is to get to 1.0 in late Summer/early Fall. At Cloudera all
our resources are committed to making things happen in time, and a more
fully featured Spark integration isn't in our plans during that period. I'm
really hoping someone in the community will help with Spark, the same way
we got a big contribution for the Flume sink.

J-D

On Sun, Apr 10, 2016 at 11:29 AM, Benjamin Kim <bbuild11@gmail.com> wrote:

> Yes, we took Kudu for a test run using 0.6 and 0.7 versions. But, since
> it’s not “production-ready”, upper management doesn’t want to fully deploy
> it yet. They just want to keep an eye on it though. Kudu was so much
> simpler and easier to use in every aspect compared to HBase. Impala was
> great for the report writers and analysts to experiment with for the short
> time it was up. But, once again, the only blocker was the lack of Spark
> support for our Data Developers/Scientists. So, production-level data
> population won’t happen until then.
>
> I hope this helps you get an idea where I am coming from…
>
> Cheers,
> Ben
>
>
> On Apr 10, 2016, at 11:08 AM, Jean-Daniel Cryans <jdcryans@apache.org>
> wrote:
>
> On Sun, Apr 10, 2016 at 12:30 AM, Benjamin Kim <bbuild11@gmail.com> wrote:
>
>> J-D,
>>
>> The main thing I hear that Cassandra is being used as an updatable hot
>> data store to ensure that duplicates are taken care of and idempotency is
>> maintained. Whether data was directly retrieved from Cassandra for
>> analytics, reports, or searches, it was not clear as to what was its main
>> use. Some also just used it for a staging area to populate downstream
>> tables in parquet format. The last thing I heard was that CQL was terrible,
>> so that rules out much use of direct queries against it.
>>
>
> I'm no C* expert, but I don't think CQL is meant for real analytics, just
> ease of use instead of plainly using the APIs. Even then, Kudu should beat
> it easily on big scans. Same for HBase. We've done benchmarks against the
> latter, not the former.
>
>
>>
>> As for our company, we have been looking for an updatable data store for
>> a long time that can be quickly queried directly either using Spark SQL or
>> Impala or some other SQL engine and still handle TB or PB of data without
>> performance degradation and many configuration headaches. For now, we are
>> using HBase to take on this role with Phoenix as a fast way to directly
>> query the data. I can see Kudu as the best way to fill this gap easily,
>> especially being the closest thing to other relational databases out there
>> in familiarity for the many SQL analytics people in our company. The other
>> alternative would be to go with AWS Redshift for the same reasons, but it
>> would come at a cost, of course. If we went with either solutions, Kudu or
>> Redshift, it would get rid of the need to extract from HBase to parquet
>> tables or export to PostgreSQL to support more of the SQL language using by
>> analysts or the reporting software we use..
>>
>
> Ok, the usual then *smile*. Looks like we're not too far off with Kudu.
> Have you folks tried Kudu with Impala yet with those use cases?
>
>
>>
>> I hope this helps.
>>
>
> It does, thanks for nice reply.
>
>
>>
>> Cheers,
>> Ben
>>
>> On Apr 9, 2016, at 2:00 PM, Jean-Daniel Cryans <jdcryans@apache.org>
>> wrote:
>>
>> Ha first time I'm hearing about SMACK. Inside Cloudera we like to refer
>> to "Impala + Kudu" as Kimpala, but yeah it's not as sexy. My colleagues who
>> were also there did say that the hype around Spark isn't dying down.
>>
>> There's definitely an overlap in the use cases that Cassandra, HBase, and
>> Kudu cater to. I wouldn't go as far as saying that C* is just an interim
>> solution for the use case you describe.
>>
>> Nothing significant happened in Kudu over the past month, it's a storage
>> engine so things move slowly *smile*. I'd love to see more contributions on
>> the Spark front. I know there's code out there that could be integrated in
>> kudu-spark, it just needs to land in gerrit. I'm sure folks will happily
>> review it.
>>
>> Do you have relevant experiences you can share? I'd love to learn more
>> about the use cases for which you envision using Kudu as a C* replacement.
>>
>> Thanks,
>>
>> J-D
>>
>> On Fri, Apr 8, 2016 at 12:45 PM, Benjamin Kim <bbuild11@gmail.com> wrote:
>>
>>> Hi J-D,
>>>
>>> My colleagues recently came back from Strata in San Jose. They told me
>>> that everything was about Spark and there is a big buzz about the SMACK
>>> stack (Spark, Mesos, Akka, Cassandra, Kafka). I still think that Cassandra
>>> is just an interim solution as a low-latency, easily queried data store. I
>>> was wondering if anything significant happened in regards to Kudu,
>>> especially on the Spark front. Plus, can you come up with your own proposed
>>> stack acronym to promote?
>>>
>>> Cheers,
>>> Ben
>>>
>>>
>>> On Mar 1, 2016, at 12:20 PM, Jean-Daniel Cryans <jdcryans@apache.org>
>>> wrote:
>>>
>>> Hi Ben,
>>>
>>> AFAIK no one in the dev community committed to any timeline. I know of
>>> one person on the Kudu Slack who's working on a better RDD, but that's
>>> about it.
>>>
>>> Regards,
>>>
>>> J-D
>>>
>>> On Tue, Mar 1, 2016 at 11:00 AM, Benjamin Kim <bkim@amobee.com> wrote:
>>>
>>>> Hi J-D,
>>>>
>>>> Quick question… Is there an ETA for KUDU-1214? I want to target a
>>>> version of Kudu to begin real testing of Spark against it for our devs. At
>>>> least, I can tell them what timeframe to anticipate.
>>>>
>>>> Just curious,
>>>> *Benjamin Kim*
>>>> *Data Solutions Architect*
>>>>
>>>> [a•mo•bee] *(n.)* the company defining digital marketing.
>>>>
>>>> *Mobile: +1 818 635 2900 <%2B1%20818%20635%202900>*
>>>> 3250 Ocean Park Blvd, Suite 200  |  Santa Monica, CA 90405  |
>>>> www.amobee.com
>>>>
>>>> On Feb 24, 2016, at 3:51 PM, Jean-Daniel Cryans <jdcryans@apache.org>
>>>> wrote:
>>>>
>>>> The DStream stuff isn't there at all. I'm not sure if it's needed
>>>> either.
>>>>
>>>> The kuduRDD is just leveraging the MR input format, ideally we'd use
>>>> scans directly.
>>>>
>>>> The SparkSQL stuff is there but it doesn't do any sort of pushdown.
>>>> It's really basic.
>>>>
>>>> The goal was to provide something for others to contribute to. We have
>>>> some basic unit tests that others can easily extend. None of us on the team
>>>> are Spark experts, but we'd be really happy to assist one improve the
>>>> kudu-spark code.
>>>>
>>>> J-D
>>>>
>>>> On Wed, Feb 24, 2016 at 3:41 PM, Benjamin Kim <bbuild11@gmail.com>
>>>> wrote:
>>>>
>>>>> J-D,
>>>>>
>>>>> It looks like it fulfills most of the basic requirements (kudu RDD,
>>>>> kudu DStream) in KUDU-1214. Am I right? Besides shoring up more Spark
SQL
>>>>> functionality (Dataframes) and doing the documentation, what more needs
to
>>>>> be done? Optimizations?
>>>>>
>>>>> I believe that it’s a good place to start using Spark with Kudu and
>>>>> compare it to HBase with Spark (not clean).
>>>>>
>>>>> Thanks,
>>>>> Ben
>>>>>
>>>>>
>>>>> On Feb 24, 2016, at 3:10 PM, Jean-Daniel Cryans <jdcryans@apache.org>
>>>>> wrote:
>>>>>
>>>>> AFAIK no one is working on it, but we did manage to get this in for
>>>>> 0.7.0: https://issues.cloudera.org/browse/KUDU-1321
>>>>>
>>>>> It's a really simple wrapper, and yes you can use SparkSQL on Kudu,
>>>>> but it will require a lot more work to make it fast/useful.
>>>>>
>>>>> Hope this helps,
>>>>>
>>>>> J-D
>>>>>
>>>>> On Wed, Feb 24, 2016 at 3:08 PM, Benjamin Kim <bbuild11@gmail.com>
>>>>> wrote:
>>>>>
>>>>>> I see this KUDU-1214 <https://issues.cloudera.org/browse/KUDU-1214>
targeted
>>>>>> for 0.8.0, but I see no progress on it. When this is complete, will
this
>>>>>> mean that Spark will be able to work with Kudu both programmatically
and as
>>>>>> a client via Spark SQL? Or is there more work that needs to be done
on the
>>>>>> Spark side for it to work?
>>>>>>
>>>>>> Just curious.
>>>>>>
>>>>>> Cheers,
>>>>>> Ben
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>

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