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Update restart guide to include the use of `solana-ledger-tool latest-optimistic-slots` (#28267)

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Michael Vines 2022-10-06 10:54:39 -07:00 committed by GitHub
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docs/src/running-validator/restart-cluster.md
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## Restarting a cluster
### Step 1. Identify the slot that the cluster will be restarted at
### Step 1. Identify the latest optimistically confirmed slot for the cluster
The highest optimistically confirmed slot is the best slot to start from, which
can be found by looking for
In Solana 1.14 or greater, run the following command to output the latest
optimistically confirmed slot your validator observed:
```bash
solana-ledger-tool -l ledger latest-optimistic-slots
```
In Solana 1.13 or less, the latest optimistically confirmed can be found by looking for the more recent occurence of
[this](https://github.com/solana-labs/solana/blob/0264147d42d506fb888f5c4c021a998e231a3e74/core/src/optimistic_confirmation_verifier.rs#L71)
metrics datapoint. Otherwise use the last root.
metrics datapoint.
Call this slot `SLOT_X`
Note that it's possible that some validators observed an optimistically
confirmed slot that's greater than others before the outage. Survey the other
validators on the cluster to ensure that a greater optimistically confirmed slot
does not exist before proceeding. If a greater slot value is found use it
instead.
### Step 2. Stop the validator(s)
### Step 3. Optionally install the new solana version