DP: Answer the question: When enabling which SteemD plugins require a chain replay

[relativityboy]

As a developer I want to know which combinations of SteemD plugins are inter-compatible in-terms of their shared memory files.

examples:

1. Plugins a & b are run from when the node was first created. The node is stopped, and plugin c is enabled on restart. No problems. The node is stopped and plugin d is enabled. Problems.
2. Plugin d is run from when the node was first created. The node is stopped, and plugin a is enabled on restart. Problems.
3. Plugin c is run from when the node was first created. The node is stopped, and any of plugins a, b, or are enabled on restart. Problems.
4. Plugins a & d are run from when the node was first created. The node is stopped, and plugins c & b are enabled on restart. No Problems.

Supporting Definitions (names can be changed)

• Plugin Group - a set of plugins where if any one of them has been enabled since node 1st created, the other plugins in the group can be enabled at a later date.
• Uncle Plugin - a plugin that creates a node memory situation where at least one other plugin can be added at a later time, that would not have been able to be added were Parent not enabled.
• Nephew Plugin - depends on either being enabled since node creation, or on an Uncle Plugin being enabled since node creation.
• Clean Plugin - Plugins that can be enabled at any time, regardless of what other plugins have/haven't been enabled.

AC

• # Results listing all sets of plugins in their above definitions

[inertia186]

For example, I have an intel skull canyon nuc with 32 GB RAM, ubuntu 16.04. Doing a replay with the following plugins is super slow (greater than 24 hours on --replay-blockchain):

plugin = chain p2p webserver block_api database_api network_broadcast_api condenser_api market_history_api tags_api follow_api

However, if I drop the last three plugins, the reply is less than 8 hours:

plugin = chain p2p webserver block_api database_api network_broadcast_api condenser_api

Once the replay is complete, if I add market_history_api tags_api follow_api, startup slows down a little, but it doesn't require a replay.