GitHub user y123456yz added a comment to the discussion: Have you considered 
introducing B+ tree(For example, wiredtiger) as the storage engine?

> > The complete WiredTiger software package is Open Source software: you are 
> > welcome to modify and redistribute it under the terms of [version 
> > 2](http://www.gnu.org/licenses/gpl-2.0-standalone.html) or [version 
> > 3](http://www.gnu.org/licenses/gpl-3.0-standalone.html) of the GNU General 
> > Public License as published by the Free Software Foundation.
> 
> According to the ASF 3rd Party License Policy[1], GPL licenses are located in 
> category x[2]. So it's disallowed to be introduced as a dependency. cc 
> @PragmaTwice
> 
> [1] https://www.apache.org/legal/resolved.html [2] 
> https://www.apache.org/legal/resolved.html#category-x

@git-hulk 
I am sorry that wiredtiger does not meet the license requirements.

In addition, I have a question. Why does rocksdb (dual-licensed under both the 
GPLv2) meet the requirements

rocksdb licence: (dual-licensed under both the GPLv2)
RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the 
root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the 
root directory). You may select, at your option, one of the above-listed 
licenses.

thanks.


GitHub link: 
https://github.com/apache/kvrocks/discussions/2931#discussioncomment-13057975

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