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From Alexey Kukushkin <akukush...@gridgain.com>
Subject Re: Thin client / Binary protocol: questions
Date Thu, 01 Mar 2018 14:37:45 GMT
Denis and All,

The links you asked for:

   - Java thin client development branch
   <https://github.com/gridgain/apache-ignite/tree/ignite-7421>
   - Code review in Upsource
   <https://reviews.ignite.apache.org/apache-ignite/review/IG-CR-23>
   - Thin client documentation
   <https://apacheignite.readme.io/v2.3/docs/java-thin-client>
      - Quick Start
      <https://apacheignite.readme.io/v2.3/docs/java-thin-client-quick-start>
      - API <https://apacheignite.readme.io/v2.3/docs/java-thin-client-api>
      - Security
      <https://apacheignite.readme.io/v2.3/docs/java-thin-client-security>
      - High Availability
      <https://apacheignite.readme.io/v2.3/docs/java-thin-client-high-availability>
      - Monitoring
      <https://apacheignite.readme.io/v2.3/docs/java-thin-client-monitoring>


On Wed, Feb 28, 2018 at 10:44 PM, Denis Magda <dmagda@apache.org> wrote:

> Guys, please consider my five cents
>
> >>> - Name/password authentication.
>> >>> When will it be available in the spec?
>> >>> Is there any draft we can look at?
>> It is still under development. Will be available in several weeks. It is
>> better to skip this part for now.
>
>
> Let's give a reference to the branch where the guys can see those changes
> at the protocol level. My guess they want to know what to expect and how it
> can affect the design they've been working on. *Alexey Kukushkin*, please
> point out to your Java thin client branch were you already have this
> functionality embedded.
>
> >>> - SSL/TLS communication.
>> >>> When will it be available in the spec?
>
>
> This doc explains how SSL is enabled on the server side:
> https://apacheignite.readme.io/docs/ssltls
>
> As always, the thin client needs to establish the SSL tunneling first and
> then starts sending the protocol messages. Hope this is good for the
> beginning. Will be happy to answer more specific questions.
>
> >>>  - May we easily use 3rd-party components with the following licenses?
>> As a general rule of thumb it is not recommended to use any external
>> libraries. The whole Ignite core is built with almost no dependencies, not
>> to say about much less complex thin clients ans JDBC/ODBC drivers. IMO the
>> only possible place where external dependency might be required is SSL
>> support (e.g. we use OpenSSL for ODBC).
>
>
> I wouldn't discourage Alexey from using 3rd party libs taking Ignite core
> as an example. Ignite optional libs use 3rd party libs a lot. Take our REST
> protocol for instance that uses Jetty and not based on its own HTTP server
> implementation. So, I would alter the rule of thumb a little bit - if it
> takes weeks to develop a functionality already available in a 3rd party lib
> then let's go for the 3rd party.
>
> Here is a list of licenses that can be included in Ignite without any
> extra permissions or licensing concerns: https://www.apache.
> org/legal/resolved.html
>
> According to the doc you're free to use Apache 2.0 and MIT, but LGPL code
> can't be delivered within Ignite.
>
> --
> Denis
>
> On Wed, Feb 28, 2018 at 2:32 AM, Vladimir Ozerov <vozerov@gridgain.com>
> wrote:
>
>> Hi Alex,
>>
>> >>> Just to double-check - we should support the types from the spec only.
>> Right?
>> Please provide the list of types you are in doubt of
>>
>> >>> - Key-Value and SQL and Scan Queries.
>> >>>  The most of operations has "Flag" field in Request: "Pass 0 for
>> default, or 1 to keep the value in binary form."
>> >>>  What is it for?
>> Please see IgniteCache.withKeepBinary method. For SQL this flag has no
>> effect. For complex SCAN queries with filters this defines whether with
>> pass real objects or binary objects to the filter.
>>
>> >>>  Java and .net libs always pass 0. Why?
>> There is no Java client at the moment. As far as .NET, it doesn't support
>> binary mode at the moment.
>>
>> >>>  Why an app working remotely via the binary protocol should know the
>> exact platform where the node is running?
>> Because if node is started from .NET, you may execute both Java filters
>> and
>> .NET fitlers on it. This flag defines what kind of filter is passed.
>>
>> >>> - Binary Type operations (register/get type name, put/get type).
>> >>>  What are they for?
>> >>>  What is a use case?
>> Please get familiar with binary type concepts, especially binary metadata:
>> https://apacheignite.readme.io/docs#binaryobject-type-metadata
>>
>> >>>  - Just interesting - why it was decided that hash code should be also
>> calculated on a client side? Why it could not be returned by a server
>> side?
>> Because this is inefficient - we would have to rebuild binary objects on
>> the server side. Instead, it is better to implement pretty simple routine
>> for hashcode calculation inside every client.
>>
>> >>> - Name/password authentication.
>> >>> When will it be available in the spec?
>> >>> Is there any draft we can look at?
>> It is still under development. Will be available in several weeks. It is
>> better to skip this part for now.
>>
>> >>> - SSL/TLS communication.
>> >>> When will it be available in the spec?
>> This is not part of protocol specification. Please refer to .NET client
>> where it is already implemented. *Pavel*, do we have docs for this?
>>
>> >>> - As Denis said, we should implement a node failover algorithm
>> (switching to another predefined node).
>> >>> Should the algorithm be the same in all thin libs?
>> >>> Is it described somewhere?
>> >>> We have not found it in java and .net libs. Will it be supported by
>> them? When?
>> It is still under development, will be ready in 1-2 weeks. Please skip for
>> now. Yes, it is better to have the same algorithm on all clients for the
>> sake of consistency.
>>
>> >>> - We are going to write the lib readme/guide in the markdown format
>> and
>> place it at the repo (.md file).
>> >>> Is it OK? Or should we use dash.readme.io ?
>> All our documentation is hosted on readme.io. There should be no
>> exclusions. *Denis*, could you make sure that necessary spaces and
>> permissions are set up?
>>
>> >>>  - May we easily use 3rd-party components with the following licenses?
>> As a general rule of thumb it is not recommended to use any external
>> libraries. The whole Ignite core is built with almost no dependencies, not
>> to say about much less complex thin clients ans JDBC/ODBC drivers. IMO the
>> only possible place where external dependency might be required is SSL
>> support (e.g. we use OpenSSL for ODBC).
>>
>> Vladimir.
>>
>> On Wed, Feb 28, 2018 at 9:41 AM, Alexey Kosenchuk <
>> alexey.kosenchuk@nobitlost.com> wrote:
>>
>> > Folks,
>> >
>> > Designing node.js thin lib (IGNITE-7777) we have the following
>> questions.
>> > Could you please have a look and clarify.
>> >
>> > Thanks,
>> > -Alexey
>> >
>> > - Supported standard types and their type codes.
>> >   Are defined in the spec: https://apacheignite.readme.io
>> > /docs/binary-client-protocol#data-format
>> >   But, as we see, java and .net libs (common parts which are used by
>> thin
>> > clients as well) support additional types and type codes, not described
>> in
>> > the spec. Eg. defined here: https://github.com/apache/igni
>> > te/blob/master/modules/core/src/main/java/org/apache/ignite/
>> > internal/binary/GridBinaryMarshaller.java
>> >   Just to double-check - we should support the types from the spec only.
>> > Right?
>> >
>> > - Key-Value and SQL and Scan Queries.
>> >   The most of operations has "Flag" field in Request: "Pass 0 for
>> default,
>> > or 1 to keep the value in binary form."
>> >   What is it for?
>> >   Java and .net libs always pass 0. Why?
>> >
>> > - OP_QUERY_SCAN: Filter platform.
>> >   Why is it required?
>> >   Why an app working remotely via the binary protocol should know the
>> > exact platform where the node is running?
>> >
>> > - Binary Type operations (register/get type name, put/get type).
>> >   What are they for?
>> >   What is a use case?
>> >   It seems possible to put data of any binary object type into a cache
>> w/o
>> > registering type name and structure in advance.
>> >
>> > - OP_REGISTER_BINARY_TYPE_NAME, OP_GET_BINARY_TYPE_NAME: Platform id.
>> >   Is it a type of the node platform?
>> >   Why a remote app should know it?
>> >   Why non-identical values are used here and in OP_QUERY_SCAN: Filter
>> > platform?
>> >
>> > - OP_REGISTER_BINARY_TYPE_NAME, OP_PUT_BINARY_TYPE
>> >   Why the both - Type name and Java-style hash code of the type name -
>> are
>> > in the request? (The same for Field name and Java-style hash code of the
>> > field name.)
>> >   Seems redundant.
>> >
>> > - Just interesting - why it was decided that hash code should be also
>> > calculated on a client side? Why it could not be returned by a server
>> side?
>> >   Eg. OP_CACHE_CREATE_WITH_NAME Response can return hash code for the
>> > provided Cache name.
>> >   That would simplify thin client implementations, guarantee
>> > consistency/correctness of hash code calculations...
>> >
>> > - Name/password authentication.
>> >   When will it be available in the spec?
>> >   Is there any draft we can look at?
>> >
>> > - SSL/TLS communication.
>> >   When will it be available in the spec?
>> >   Is there any draft we can look at?
>> >
>> > - As Denis said, we should implement a node failover algorithm
>> (switching
>> > to another predefined node).
>> >   Should the algorithm be the same in all thin libs?
>> >   Is it described somewhere?
>> >   We have not found it in java and .net libs. Will it be supported by
>> > them? When?
>> >
>> > - Is there any recommendation/suggestion how to test a node failover
>> case
>> > on a thin client side?
>> >
>> > - We are going to use jsdoc comments for the API methods:
>> > http://usejsdoc.org/
>> >   This tool, for example, may be used to generate the API spec from the
>> > comments: https://www.npmjs.com/package/jsdoc
>> >   Any objections?
>> >
>> > - We are going to write the lib readme/guide in the markdown format and
>> > place it at the repo (.md file).
>> >   Is it OK? Or should we use dash.readme.io ?
>> >
>> > - May we easily use 3rd-party components with the following licenses?
>> >     -- Apache 2.0
>> >     -- MIT
>> >     -- GNU LGPL v3
>> >     -- GNU GPL v2
>> >   Should we pre-approve somehow / notify somebody about usage of
>> concrete
>> > 3rd-party components?
>> >
>>
>
>


-- 
Best regards,
Alexey
+7 981 156 56 47

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