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| author | Péter Szilágyi <peterke@gmail.com> | 2017-03-22 08:37:24 +0800 |
|---|---|---|
| committer | Felix Lange <fjl@users.noreply.github.com> | 2017-03-22 08:37:24 +0800 |
| commit | 9b84caf3a5f55cc2a14b50291118b9fab668b8c2 (patch) | |
| tree | 0c9f92abf034f6a3e8f0cbc7458b209331fd7c8f /eth/sync.go | |
| parent | 06d6685eb58f6cb0eda4d7adc8ae91e5cdb88462 (diff) | |
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core, eth, les: support resuming fast sync on heavy rollback (#3743)
Diffstat (limited to 'eth/sync.go')
| -rw-r--r-- | eth/sync.go | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/eth/sync.go b/eth/sync.go index 6e2c7c432..f2cae6c19 100644 --- a/eth/sync.go +++ b/eth/sync.go @@ -175,6 +175,14 @@ func (pm *ProtocolManager) synchronise(peer *peer) { // Otherwise try to sync with the downloader mode := downloader.FullSync if atomic.LoadUint32(&pm.fastSync) == 1 { + // Fast sync was explicitly requested, and explicitly granted + mode = downloader.FastSync + } else if currentBlock.NumberU64() == 0 && pm.blockchain.CurrentFastBlock().NumberU64() > 0 { + // The database seems empty as the current block is the genesis. Yet the fast + // block is ahead, so fast sync was enabled for this node at a certain point. + // The only scenario where this can happen is if the user manually (or via a + // bad block) rolled back a fast sync node below the sync point. In this case + // however it's safe to reenable fast sync. mode = downloader.FastSync } if err := pm.downloader.Synchronise(peer.id, pHead, pTd, mode); err != nil { |