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MN Sync

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- Add ongoing sync drawing
 - Re-arrange layout / rename some sections
 - Add additional details about ongoing sync

Correct issue w/ mnget P2P message in dev ref
Add masternode sync drawing
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thephez 2017-11-08 12:30:29 -05:00
parent f8f3d29e64
commit 160bde7d39
4 changed files with 850 additions and 66 deletions
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147
_includes/devdoc/guide_p2p_network.md
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@ -674,75 +674,15 @@ several conditions that initiate a start/restart the sync process:
* A failure occurred during the last sync attempt (after a 1 minute cooldown before sync restarts)
* Issuing a `mnsync reset` RPC command
Once a masternode completes an initial full sync, continuing synchronization is
maintained by the exchange of P2P messages with other nodes. Each masternode
issues a ping (`mnp` message) periodically to notify others that it is still
online. Masternodes that do not issue a ping for 3 hours will be put into the
`MASTERNODE_NEW_START_REQUIRED` state and will need to issue a masternode
announce (`mnb` message).
*Masternode List*
After the initial masternode list has been received, it is kept current by a
combination of the periodic `mnp` messages received from other masternodes and
the `mnb` messages sent by masternodes as they come online. Also, `dseg` messages
can be sent to request masternode info when messages are received containing
unrecognized masternode `vin` entries (most masternode/governance messages
include a `vin` value that can be used to verify the masternode's unspent 1000
Dash).
*Masternode Payment*
After the initial masternode payment synchronization, payment information is
kept current via the `mnw` messages relayed on the network.
#### Masternode Sync Status
There are several status values used to track masternode synchronization. They
are used in both `ssc` messages and the `mnsync` RPC.
| **Value** | **Status** | **Description** |
| -1 | `MASTERNODE_SYNC_FAILED` | Synchronization failed |
| 0 | `MASTERNODE_SYNC_INITIAL` | Synchronization just started, was reset recently, or is still in IBD |
| 1 | `MASTERNODE_SYNC_WAITING` | Synchronization pending - waiting after initial to check for more headers/blocks |
| 2 | `MASTERNODE_SYNC_LIST` | Synchronizing masternode list |
| 3 | `MASTERNODE_SYNC_MNW` | Synchronizing masternode payments |
| 4 | `MASTERNODE_SYNC_GOVERNANCE` | Synchronizing governance objects |
| 999 | `MASTERNODE_SYNC_FINISHED` | Synchronization finished |
#### Masternode Sync Schedule
The following tables detail the timing of various functions used to keep the
masternodes in sync with each other. This information is derived from
`ThreadCheckPrivateSend` in `src/privatesend.cpp`.
| **Period (seconds)** | **Action** | **Description** |
| 6 | MN Sync | Synchronizes sporks, masternode list, masternode payments, and governance objects |
The following actions only run when the masternode sync is past `MASTERNODE_SYNC_WAITING` status.
| **Period (seconds)** | **Action** | **Description** |
| 1 | MN Check | Check the state of each masternode that is still funded and not banned. The action occurs once per second, but individual masternodes are only checked at most every 5 seconds (only a subset of masternodes are checked each time it runs) |
| 60 | Process MN Connections | Disconnects some masternodes |
| 60 | MN Check/Remove | Remove spent masternodes and check the state of inactive ones |
| 60 | MN Payment Check/Remove | Remove old masternode payment votes/blocks |
| 60 | InstantSend Check/Remove | Remove expired/orphaned/invalid InstantSend candidates and votes |
| 300 | Full verification | Verify masternodes via direct requests (`mnv` messages - note time constraints in the Developer Reference section) |
| 300 | Maintenance | Check/remove/reprocess governance objects |
| 600 | Manage State | Sends masternode pings (`mnp` message). Also sends initial masternode broadcast (`mnb` message) for local masternodes. |
#### Masternode Sync Data Flow
#### Initial Masternode Sync
This diagram shows the order in which P2P messages are sent to perform
masternode synchronization initially after startup.
![Masternode Sync (Initial)](/img/dev/en-masternode-sync-initial.svg)
The following table details the exchanged of P2P messages during masternode
synchronization.
The following table details the data flow of P2P messages exchanged during
initial masternode synchronization.
| **Syncing Node Message** | **Direction** | **Masternode Response** | **Description** |
| **1. Sporks** | | | |
@ -765,8 +705,87 @@ synchronization.
| | ← | `mnw` message(s) | (If requested) Masternode payment vote message
| **4. Governance** | | | See [Governance sync](#governance) |
{% endautocrossref %}
*Masternode Sync Status*
There are several status values used to track masternode synchronization. They
are used in both `ssc` messages and the `mnsync` RPC.
| **Value** | **Status** | **Description** |
| -1 | `MASTERNODE_SYNC_FAILED` | Synchronization failed |
| 0 | `MASTERNODE_SYNC_INITIAL` | Synchronization just started, was reset recently, or is still in IBD |
| 1 | `MASTERNODE_SYNC_WAITING` | Synchronization pending - waiting after initial to check for more headers/blocks |
| 2 | `MASTERNODE_SYNC_LIST` | Synchronizing masternode list |
| 3 | `MASTERNODE_SYNC_MNW` | Synchronizing masternode payments |
| 4 | `MASTERNODE_SYNC_GOVERNANCE` | Synchronizing governance objects |
| 999 | `MASTERNODE_SYNC_FINISHED` | Synchronization finished |
#### Ongoing Masternode Sync
Once a masternode completes an initial full sync, continuing synchronization is
maintained by the exchange of P2P messages with other nodes. This diagram shows
an overview of the messages exchanged to keep the masternode list, masternode
payments, and governance objects synchronized between masternodes.
![Masternode Sync (Ongoing)](/img/dev/en-masternode-sync-ongoing.svg)
**Recurring Ping**
Each masternode issues a ping (`mnp` message) periodically to notify the network
that it is still online. Masternodes that do not issue a ping for 3 hours will
be put into the `MASTERNODE_NEW_START_REQUIRED` state and will need to issue a
masternode announce (`mnb` message).
**Masternode List**
After the initial masternode list has been received, it is kept current by a
combination of the periodic `mnp` messages received from other masternodes,
the `mnb` messages sent by masternodes as they come online, and `mnv` messages
to verify that other masternodes are valid.
Also, `dseg` messages can be sent to request masternode info when messages are
received that have been signed by an unrecognized masternode (most masternode/governance
messages include a `vin` value that can be used to verify the masternode's
unspent 1000 Dash).
Unsynchronized peers may send a `dseg` message to request the entire masternode list.
**Masternode Payment**
After the initial masternode payment synchronization, payment information is
kept current via the `mnw` messages relayed on the network. Unsynchronized peers
may send a `mnget` message to request masternode payment sync.
**Governance**
After the initial governance synchronization, governance information is kept
current by the `govobj` messages and `govobjvote` messages relayed on the
network. Unsynchronized peers may send `govsync` messages to request governance
sync.
#### Masternode Sync Schedule
The following tables detail the timing of various functions used to keep the
masternodes in sync with each other. This information is derived from
`ThreadCheckPrivateSend` in `src/privatesend.cpp`.
| **Period (seconds)** | **Action** | **Description** |
| 6 | MN Sync | Synchronizes sporks, masternode list, masternode payments, and governance objects |
The following actions only run when the masternode sync is past `MASTERNODE_SYNC_WAITING` status.
| **Period (seconds)** | **Action** | **Description** |
| 1 | MN Check | Check the state of each masternode that is still funded and not banned. The action occurs once per second, but individual masternodes are only checked at most every 5 seconds (only a subset of masternodes are checked each time it runs) |
| 60 | Process MN Connections | Disconnects some masternodes |
| 60 | MN Check/Remove | Remove spent masternodes and check the state of inactive ones |
| 60 | MN Payment Check/Remove | Remove old masternode payment votes/blocks |
| 60 | InstantSend Check/Remove | Remove expired/orphaned/invalid InstantSend candidates and votes |
| 300 | Full verification | Verify masternodes via direct requests (`mnv` messages - note time constraints in the Developer Reference section) |
| 300 | Maintenance | Check/remove/reprocess governance objects |
| 600 | Manage State | Sends masternode pings (`mnp` message). Also sends initial masternode broadcast (`mnb` message) for local masternodes. |
{% endautocrossref %}
### Governance

4
_includes/devdoc/ref_p2p_networking.md
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@ -2311,8 +2311,8 @@ Masternode Ping Message
{% autocrossref %}
The `mnget` message requests masternode payment sync. The response to an
`mnget` message is an `mnb` message inventory and an `mnp` message inventory for
each requested masternode. Masternodes ignore this request if they are not fully synced.
`mnget` message is `mnw` message inventories (up to the number asked for in the
request). Masternodes ignore this request if they are not fully synced.
| Bytes | Name | Data type | Required | Description |
| ---------- | ----------- | --------- | -------- | -------- |