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Some updates in Lighthouse Book (#5000)

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* Add jq in api-bn

* Update beaconstate size

* Add fields to web3signer API

* Link web3signer API

* Update /lighthouse/logs in table

* plural

* update slasher doc

* update FAQ

* Add link in validator section

* Add more info on state pruning

* Update database size

* Merge branch 'unstable' into book-update

* Revise Siren for vc to connect bn

* Merge branch 'book-update' of https://github.com/chong-he/lighthouse into book-update

* Corrections to siren faq

* Fix typos

* Update release date for 4.6.0

* Merge branch 'unstable' into book-update
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chonghe
2024-02-01 02:11:54 +08:00
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parent f02189c86a
commit ab6a6e0741
9 changed files with 70 additions and 34 deletions
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book/src/advanced_database.md
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@@ -23,15 +23,13 @@ states to slow down dramatically. A lower _slots per restore point_ value (SPRP)
frequent restore points, while a higher SPRP corresponds to less frequent. The table below shows
some example values.
| Use Case | SPRP | Yearly Disk Usage* | Load Historical State |
| Use Case | SPRP | Yearly Disk Usage*| Load Historical State |
|----------------------------|------|-------------------|-----------------------|
| Research | 32 | 3.4 TB | 155 ms |
| Block explorer/analysis | 128 | 851 GB | 620 ms |
| Enthusiast (prev. default) | 2048 | 53.6 GB | 10.2 s |
| Hobbyist | 4096 | 26.8 GB | 20.5 s |
| Validator only (default) | 8192 | 12.7 GB | 41 s |
| Research | 32 | more than 10 TB | 155 ms |
| Enthusiast (prev. default) | 2048 | hundreds of GB | 10.2 s |
| Validator only (default) | 8192 | tens of GB | 41 s |
*Last update: May 2023.
*Last update: Dec 2023.
As we can see, it's a high-stakes trade-off! The relationships to disk usage and historical state
load time are both linear – doubling SPRP halves disk usage and doubles load time. The minimum SPRP
@@ -41,12 +39,12 @@ The default value is 8192 for databases synced from scratch using Lighthouse v2.
2048 for prior versions. Please see the section on [Defaults](#defaults) below.
The values shown in the table are approximate, calculated using a simple heuristic: each
`BeaconState` consumes around 18MB of disk space, and each block replayed takes around 5ms. The
`BeaconState` consumes around 145MB of disk space, and each block replayed takes around 5ms. The
**Yearly Disk Usage** column shows the approximate size of the freezer DB _alone_ (hot DB not included), calculated proportionally using the total freezer database disk usage.
The **Load Historical State** time is the worst-case load time for a state in the last slot
before a restore point.
As an example, we use an SPRP of 4096 to calculate the total size of the freezer database until May 2023. It has been about 900 days since the genesis, the total disk usage by the freezer database is therefore: 900/365*26.8 GB = 66 GB.
To run a full archival node with fast access to beacon states and a SPRP of 32, the disk usage will be more than 10 TB per year, which is impractical for many users. As such, users may consider running the [tree-states](https://github.com/sigp/lighthouse/releases/tag/v4.5.444-exp) release, which only uses less than 150 GB for a full archival node. The caveat is that it is currently experimental and in alpha release (as of Dec 2023), thus not recommended for running mainnet validators. Nevertheless, it is suitable to be used for analysis purposes, and if you encounter any issues in tree-states, we do appreciate any feedback. We plan to have a stable release of tree-states in 1H 2024.
### Defaults