Problem Definition

This was brought up in a similar issue. Currently, Tendermint uses a mutex around ABCI calls so that they are serialized. This was done out of safety and simplicity. However, this restricts the ability for apps to implement any form of concurrency between the applications. It should thus really be the responsibility of application to handle mutexes.

Proposal

Remove the mutex here:

We should make sure that the change in responsibility is well documented

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned