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From Shuyi Chen <suez1...@gmail.com>
Subject Re: [DISCUSS] Integrate Flink SQL well with Hive ecosystem
Date Sun, 14 Oct 2018 00:30:14 GMT
Welcome to the community and thanks for the great proposal, Xuefu! I think
the proposal can be divided into 2 stages: making Flink to support Hive
features, and make Hive to work with Flink. I agreed with Timo that on
starting with a smaller scope, so we can make progress faster. As for [6],
a proposal for DDL is already in progress, and will come after the unified
SQL connector API is done. For supporting Hive syntax, we might need to
work with the Calcite community, and a recent effort called babel (
https://issues.apache.org/jira/browse/CALCITE-2280) in Calcite might help


On Wed, Oct 10, 2018 at 8:02 PM Zhang, Xuefu <xuefu.z@alibaba-inc.com>

> Hi Fabian/Vno,
> Thank you very much for your encouragement inquiry. Sorry that I didn't
> see Fabian's email until I read Vino's response just now. (Somehow Fabian's
> went to the spam folder.)
> My proposal contains long-term and short-terms goals. Nevertheless, the
> effort will focus on the following areas, including Fabian's list:
> 1. Hive metastore connectivity - This covers both read/write access, which
> means Flink can make full use of Hive's metastore as its catalog (at least
> for the batch but can extend for streaming as well).
> 2. Metadata compatibility - Objects (databases, tables, partitions, etc)
> created by Hive can be understood by Flink and the reverse direction is
> true also.
> 3. Data compatibility - Similar to #2, data produced by Hive can be
> consumed by Flink and vise versa.
> 4. Support Hive UDFs - For all Hive's native udfs, Flink either provides
> its own implementation or make Hive's implementation work in Flink.
> Further, for user created UDFs in Hive, Flink SQL should provide a
> mechanism allowing user to import them into Flink without any code change
> required.
> 5. Data types -  Flink SQL should support all data types that are
> available in Hive.
> 6. SQL Language - Flink SQL should support SQL standard (such as SQL2003)
> with extension to support Hive's syntax and language features, around DDL,
> DML, and SELECT queries.
> 7.  SQL CLI - this is currently developing in Flink but more effort is
> needed.
> 8. Server - provide a server that's compatible with Hive's HiverServer2 in
> thrift APIs, such that HiveServer2 users can reuse their existing client
> (such as beeline) but connect to Flink's thrift server instead.
> 9. JDBC/ODBC drivers - Flink may provide its own JDBC/ODBC drivers for
> other application to use to connect to its thrift server
> 10. Support other user's customizations in Hive, such as Hive Serdes,
> storage handlers, etc.
> 11. Better task failure tolerance and task scheduling at Flink runtime.
> As you can see, achieving all those requires significant effort and across
> all layers in Flink. However, a short-term goal could  include only core
> areas (such as 1, 2, 4, 5, 6, 7) or start  at a smaller scope (such as #3,
> #6).
> Please share your further thoughts. If we generally agree that this is the
> right direction, I could come up with a formal proposal quickly and then we
> can follow up with broader discussions.
> Thanks,
> Xuefu
> ------------------------------------------------------------------
> Sender:vino yang <yanghua1127@gmail.com>
> Sent at:2018 Oct 11 (Thu) 09:45
> Recipient:Fabian Hueske <fhueske@gmail.com>
> Cc:dev <dev@flink.apache.org>; Xuefu <xuefu.z@alibaba-inc.com>; user <
> user@flink.apache.org>
> Subject:Re: [DISCUSS] Integrate Flink SQL well with Hive ecosystem
> Hi Xuefu,
> Appreciate this proposal, and like Fabian, it would look better if you can
> give more details of the plan.
> Thanks, vino.
> Fabian Hueske <fhueske@gmail.com> 于2018年10月10日周三 下午5:27写道:
> Hi Xuefu,
> Welcome to the Flink community and thanks for starting this discussion!
> Better Hive integration would be really great!
> Can you go into details of what you are proposing? I can think of a couple
> ways to improve Flink in that regard:
> * Support for Hive UDFs
> * Support for Hive metadata catalog
> * Support for HiveQL syntax
> * ???
> Best, Fabian
> Am Di., 9. Okt. 2018 um 19:22 Uhr schrieb Zhang, Xuefu <
> xuefu.z@alibaba-inc.com>:
> Hi all,
> Along with the community's effort, inside Alibaba we have explored Flink's
> potential as an execution engine not just for stream processing but also
> for batch processing. We are encouraged by our findings and have initiated
> our effort to make Flink's SQL capabilities full-fledged. When comparing
> what's available in Flink to the offerings from competitive data processing
> engines, we identified a major gap in Flink: a well integration with Hive
> ecosystem. This is crucial to the success of Flink SQL and batch due to the
> well-established data ecosystem around Hive. Therefore, we have done some
> initial work along this direction but there are still a lot of effort
> needed.
> We have two strategies in mind. The first one is to make Flink SQL
> full-fledged and well-integrated with Hive ecosystem. This is a similar
> approach to what Spark SQL adopted. The second strategy is to make Hive
> itself work with Flink, similar to the proposal in [1]. Each approach bears
> its pros and cons, but they don’t need to be mutually exclusive with each
> targeting at different users and use cases. We believe that both will
> promote a much greater adoption of Flink beyond stream processing.
> We have been focused on the first approach and would like to showcase
> Flink's batch and SQL capabilities with Flink SQL. However, we have also
> planned to start strategy #2 as the follow-up effort.
> I'm completely new to Flink(, with a short bio [2] below), though many of
> my colleagues here at Alibaba are long-time contributors. Nevertheless, I'd
> like to share our thoughts and invite your early feedback. At the same
> time, I am working on a detailed proposal on Flink SQL's integration with
> Hive ecosystem, which will be also shared when ready.
> While the ideas are simple, each approach will demand significant effort,
> more than what we can afford. Thus, the input and contributions from the
> communities are greatly welcome and appreciated.
> Regards,
> Xuefu
> References:
> [1] https://issues.apache.org/jira/browse/HIVE-10712
> [2] Xuefu Zhang is a long-time open source veteran, worked or working on
> many projects under Apache Foundation, of which he is also an honored
> member. About 10 years ago he worked in the Hadoop team at Yahoo where the
> projects just got started. Later he worked at Cloudera, initiating and
> leading the development of Hive on Spark project in the communities and
> across many organizations. Prior to joining Alibaba, he worked at Uber
> where he promoted Hive on Spark to all Uber's SQL on Hadoop workload and
> significantly improved Uber's cluster efficiency.

"So you have to trust that the dots will somehow connect in your future."

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