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Ask for txhashet before horizon to account for fast sync time

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We test if we're in fast sync or not by checking if our head is
more recent than horizon. However, by the time we get the data and
validate, more blocks have passed, and we'd be after horizon again.
So we request the txhashset for a more recent block than the one
at horizon.

The current value was 20, leaving only 20 min of slack, which isn't
enough for debug builds and isn't future-proof. Change to use
`0.9*horizon`, leaving about 2.5 hours.
This commit is contained in:
Ignotus Peverell 2018-05-12 21:31:22 +01:00
parent 9909e8e2ff
commit ce1dca1b68
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1 changed files with 3 additions and 2 deletions
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5
servers/src/grin/sync.rs
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@ -248,9 +248,10 @@ fn fast_sync(peers: Arc<Peers>, chain: Arc<chain::Chain>, header_head: &chain::T
header_head.last_block_h header_head.last_block_h
); );
// ask for txhashset at horizon // ask for txhashset at 90% of horizon, this still leaves time for download
// and validation to happen and stay within horizon
let mut txhashset_head = chain.get_block_header(&header_head.prev_block_h).unwrap(); let mut txhashset_head = chain.get_block_header(&header_head.prev_block_h).unwrap();
for _ in 0..horizon.saturating_sub(20) { for _ in 0..(horizon - horizon / 10) {
txhashset_head = chain.get_block_header(&txhashset_head.previous).unwrap(); txhashset_head = chain.get_block_header(&txhashset_head.previous).unwrap();
} }
p.send_txhashset_request(txhashset_head.height, txhashset_head.hash()) p.send_txhashset_request(txhashset_head.height, txhashset_head.hash())