Hi Matteo,
I looked at the dependencies in Splunk LightPro and the following are not
acceptable in an Apache Binary:
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh.version}</version>
<scope>provided</scope>
</dependency>
These are GPL according to mvnrepository.com.
The other dependencies are fine and all class A or B.
Have a look at https://www.apache.org/legal/resolved.html
Regards,
Dave
> On Dec 23, 2020, at 9:35 AM, Matteo Merli <mme...@apache.org> wrote:
>
> ## Motivation
>
> In the Pulsar wire protocol, we are using Google Protobuf in order to perform
> serialization/deserialization of the commands that are exchanged between
> clients and brokers.
>
> Because of the overhead involved with the regular Protobuf implementation,
> since
> very early on, we have been using a modified version of Protobuf 2.4.1.
> The modifications were done to ensure a more efficient serialization code that
> used thread local caches for the objects used in the process.
>
> There are few issues with the current approach:
> 1. The patch to the Protobuf code generator is only based on version 2.4.1 and
> cannot be upgraded to newer Protobuf versions
> 2. The new Protobuf version, 3.xx, do have the same performance issues as the
> 2.x versions.
> 3. The thread-local approach for reusing objects is not ideal. Thread-local
> access is not free and it would be better to instead cache the root objects
> only.
>
> ## Goal
>
> Have an efficient and maintainable way to perform
> serialization/deserialization
> of Pulsar protocol.
>
> The current proposal is to switch from the patched Protobuf 2.4.1 and use a
> different code generator, Splunk LightProto:
> https://github.com/splunk/lightproto.
>
> This code generator has the following features/goals:
>
> 1. Generate the fastest possible Java code for Protobuf SerDe
> 2. 100% Compatible with proto2 definition and wire protocol
> 3. Zero-copy deserialization using Netty ByteBuf
> 4. Deserialize from direct memory
> 5. Zero heap allocations in serialization / deserialization
> 6. Lazy deserialization of strings and bytes
> 7. Reusable mutable objects
> 8. No runtime dependency library
> 9. Java based code generator with Maven plugin
>
> There is extensive testing to ensure the generated code serializes and parses
> the same bytes in the same way as the Google Protobuf does.
>
>
> --
> Matteo Merli
> <mme...@apache.org>
