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From Hyunsik Choi <hyun...@apache.org>
Subject Re: [DISCUSS] 0.8.0 release and next roadmap
Date Sat, 05 Apr 2014 13:56:21 GMT
Hi David,

Thank you for your nice suggestions. I totally agree with your
suggestion, and we are looking forward to the work to have Tajo run on
Yarn cluster. Actually, I have thought that there may be two
approaches to support Yarn. The first approach is to use deploy a Tajo
cluster (i.e., a long-running application) in Yarn cluster. The second
approach is that each query becomes an individual application in Yarn.
I also think that there will be other approaches that I didn't
imagine. I believe that we will find nice approaches and the effort
would be very exciting.

I agree with the significance of nested schema and non-scalar types.
You seem to proceed the work faster. As you mentioned, we could
release Tajo with different-level of schema extensions.

Table partitioning is very interesting area. As far as I know, dynamic
partitions are still challenge in many systems. There will be
interesting problem to be solved. I think that you can readily figure
out the current status of Tajo's table partition if you take a look at
SortBasedColPartitionStoreExec and HashBasedColPartitionStoreExec. I
hope that your exploration would be exciting.

Many thanks,

On Sat, Apr 5, 2014 at 12:20 AM, David Chen <dchen@linkedin.com> wrote:
> Hi Hyunsik,
> Thank you very much for sharing the roadmap. I am very excited for the 0.8.0 release
and for the projects on the roadmap for future releases.
> I agree with Min that Tajo on YARN will be an important project. I think there will be
a good amount of work to not only have Tajo run on YARN but also run well on a YARN cluster
co-resident with other YARN applications. I think through this effort, we will likely also
find areas of for improving multi-tenancy in YARN as well since YARN is still relatively young
and has not been battle-tested that much yet.
> As you mentioned, one of the projects I would like to focus on is adding support for
nested schemas and non-scalar types. This way, we would be able to take full advantage of
columnar storage formats like Parquet, which is designed to work well with nested schemas.
I understand that this will be a significant project, but I think it may be possible to divide
up the work as I have done with the sub-tasks to TAJO-710 and push out support for each type
incrementally across different releases.
> Another area that I would like to learn some more about is partitioning. I have just
begun to look at TAJO-283 and am still ramping up on some of the context and the current status
of the effort, but I am interested in exploring the possibility of enabling smart dynamic
partitioning based on the way a table is queried but avoiding some of the current problems
of dynamic partitioning such as creating too many files. One possible approach that I am thinking
about is the possibility of building indices that point to offsets within files. Anyway, this
is still more of a research problem, but is one that I would like to explore.
> Thanks,
> David
> On Apr 3, 2014, at 10:24 PM, Hyunsik Choi <hyunsik@apache.org> wrote:
>> Hi folks,
>> I'm very happy to see that our community is growing! Also, It's a pleasure
>> to discuss the Tajo 0.8.0 release. Recently, I've tested various features
>> in various contexts, and tried to figure out if there are any critical
>> problems. I think that there are only a few issues and we can release 0.8.0
>> next week. If there are further issues to be solved before the 0.8.0
>> release, feel free to suggest ideas.
>> Also, I'd like to discuss our next roadmap. We are open to any suggestion
>> from users, contributors, and committers. Please fire away!
>> I'm thinking that our next stage should focus on improving the way Tajo
>> runs in thousands of large cluster nodes and for a number of concurrent
>> users. The key issues associated with this include the following:
>> * High availability
>> * Multi-tenancy scheduling
>> * More stability
>> * Improved shuffle
>> The current work status is as follows. Min is working on Tajo's new
>> scheduler (TAJO-540) based on sparrow. I'll support him. As far as I know,
>> Alvin is working on TajoMaster HA (TAJO-704). Also, some guys including
>> myself are investigating and solving the issues which occur in large
>> clusters. These issues should be solved in order to make Tajo a complete
>> enterprise-ready production.
>> In addition, there are some SQL feature support issues. Many analytic
>> problems require window functions. Also, in-subquery and scalar subquery
>> should be supported. So, I'd like to schedule them with high priority. In
>> my view, there will be very few SQL support issues if Tajo provides these
>> features.
>> Besides those areas, David is working on a nested schema and its related
>> work (TAJO-710). I guess this will take quite a while because it requires a
>> lot of hard work. So, it would be great to schedule the nested schema
>> loosely. That's just my thoughts, anyhow.
>> Aside from the discussion of our roadmap, I'd like to suggest that we need
>> to release more frequently after the 0.8.0 release. So far, there has been
>> a long period between each release because Tajo is undergoing heavy
>> development. By 'releasing early, releasing often', we will make more
>> tighter feedback loop between users and developers.
>> I think that there are many additional many interesting issues to be
>> included in our roadmap. Feel free to suggest your idea. We will arrange
>> our short-term roadmap and long-term roadmap based on your suggestions.
>> Thank you all so much for your contribution!
>> Warm Regards,
>> Hyunsik

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