Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Start collaborating and sharing organizational knowledge. Create a free Team Why Teams? Learn more. What is Geth's "fast" sync, and why is it faster? Ask Question. Asked 6 years, 2 months ago. Modified 1 year, 8 months ago. Viewed k times. Edit: As of Geth version 1. Improve this question. Richard Horrocks. Richard Horrocks Richard Horrocks Add a comment. Sorted by: Reset to default.
Highest score default Date modified newest first Date created oldest first. Here's a quote: Instead of processing the entire block-chain one link at a time, and replay all transactions that ever happened in history, fast syncing downloads the transaction receipts along the blocks, and pulls an entire recent state database. Improve this answer. Why not make --fast the default? Because then you lose the state with it. The receipts only say that these actions happened, they don't actually show the results of the executions.
VoR loosing state isn't actual the problem. The problem is that when we'd enable --fast for any point in time we'd open ourself up to attacks where an attacker has an infinite time window in which they can attack the victim in accepting a valid header but with an invalid state. This problem exist also with catching up from scratch, but due to some randomisation we can easily battle this.
So JeffreyW. I am syncing geth with it right now and I would need to know if I am becoming vulnerable to hackings by doing so. Synching from scratch is fine, you are not vulnerable — Jeffrey W. That said, the Ethereum state is large and getting larger. Be patient and it will be worth it.
Prior answer As --fast is often the only thing associated with a fast sync, don't forget --cache too. From the Homestead Guide: Below are some flags to use when you want to sync your client more quickly. Alexey Koshlatyy Alexey Koshlatyy 83 5 5 bronze badges. Yep, related: ethereum. This is no more true: Blockchain sync mode "fast", "full", "snap" or "light" default: snap — Aniket.
How do Ethereum syncing work? Q: Why does downloading the state take so long, I have good bandwidth? The Overflow Blog. Use Git tactically. You should be reading academic computer science papers. Featured on Meta. Linked This is how most internet providers are able to offer access to household computers. The provider itself has a small range of IPs it acquires from a backbone operator, and these IPs are distributed to its customers. One small internet provider IP can serve thousands of non-routable private IPs.
Imagine if there were no filtering, everyone's files and insecure configurations would be open to the world. This has, in fact, already been exploited by hackers before. For example, when worldwide printers started spitting out funny drawings, because hackers had found thousands of open and shared printers on unfiltered networks! When this does not happen, the uploaders quickly run out of bandwidth and the P2P network slows down. Most Ethereum full nodes sit behind heavily filtered NAT firewalls and there is very little the core devs can do about this.
We won't go into the details of how this works, but what you must know is that this algorithm requires the full chain structure to be downloaded before each block can be committed to the local blockchain database. As we've mentioned, some blocks are gigantic and take days to fully download the whole chain structure. While this chain structure does not finish downloading, the block count sits frozen.
Users often report this as a bug or as "frozen wallets", but the fact is if you look at the underlying geth logs you'll see that it is downloading the chain structure for the block in the background. This, combined with the NAT-filtered network and difficulty to find peers, can make the syncing very slow. So, what can you do about these known issues?
While there is no definitive recipe, here are a few tips to help you speed up your full Ethereum node sync. Keep in mind that you can use Ethereum without having to download the entire blockchain to your computer. The tradeoff to using a thin wallet is some loss of trust : you must trust that the chain contained in the node to which it is connected will be the official Ethereum network blockchain.
Otherwise this trusted node could temporarily route your transactions elsewhere or even broadcast invalid TX's. In theory, you don't need very powerful hardware to run an Ethereum node. Since it's mostly a network and IO-bound process, you'll need good Internet connectivity and fast hard drives with at least a couple of Terabytes free space.
Hard disk : At least 2 TB. The Ethereum blockchain is huge and growing fast. Internet speed is critical for mining. For instance, OpenEthereum formerly Parity Ethereum has been gaining popularity recently. You may also run web-based light wallets which do not require the blockchain to be downloaded at all. MyEtherWallet is a popular choice in this category, but there are others.
Find an Ethereum wallet that's right for your need. Geth full sync so slow Geth 1. Ethereum Wallet Syncing Problems. Why is the geth sync so slow? Slow Geth Users have been complaining forever now about the notoriously slow geth sync on the official Ethereum wallet. While geth syncs, full Ethereum node admins may end up seeing a screen, such as the one below, for a very long time: Fast Sync Optimization There are countless valid arguments in the "Ethereum sync is too slow" camp - and the Ethereum core devs did take note of the issue.
Why does this happen? Known Issues There are currently a few known issues which make Ethereum syncing very slow : Clients have difficulty finding peers. Ethereum is P2P, like bit torrent. When there are few peers with slow connections, the transfer rates can be very low and the transfer may even halt. Users then report "having the same block on screen for days". That is because the download for the next block is taking a very long time and there's no progress indication for the incomplete transfer.
Spam on the blockchain. There have been many attacks on Ethereum as with every other popular cryptocurrency. Unlike Bitcoin and its 1 MB block size, Ethereum block size is not limited. Some blocks are gigantic. Note the dissonance with the "bigger block" movement in the Bitcoin community? Nodes behind NAT. Full nodes need to serve the same bandwitdh as they request from the network.
When this doesn't happen we get what the Torrent community calls "leeches". The "fast" algorithm requires the entire chain structure to be downloaded , per block, before processing the block. Let's take a quick look at each of these factors. Finding Peers There's very little we can do about this issue.
Spam Spam is a problem in every Internet related crowd-driven technology. Block Size If there's one good argument against increasing block size in the Bitcoin blockchain, then Ethereum must be it. Ethereum blocks can be of any arbitrary size, limited only by the GAS limit itself. A bigger and more complex contract requires more GAS than a small and simple one. GAS is the computation currency in the "world computer" composed of all Ethereum nodes.
So NAT is there to help us. But there's a catch. NAT is terrible for P2P networks. The Fast Algorithm Finally, there's the new fast syncing algorithm. Realize that the nature of P2P is non deterministic. That is, if you restart the geth client, you might get a totally different set of peers which may be a lot faster or slower than the peers you had before. Therefore, restarting geth does get things sorted out sometimes. This may seem unintuitive, but simply restarting geth does work sometimes.
This requires some technical knowledge, but it does get you out of the NAT blockade and downloading the chain from Amazon servers will be faster than the P2P system.
|Crypto iq review||Q: Why does downloading the state take so long, I have good bandwidth? If a user knows the Merkle root i. To solve this problem, Geth flattens the global state trie by writing each node as a key-value pair: the key is the hash of the node and the value is the serialized node itself. Full nodes need to serve the same bandwitdh as they request from the network. Geth finds peers through something called the discovery protocol. Spam Spam is a problem in every Internet related crowd-driven technology.|
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Before a full node can become a first-class citizen of Ethereum, it must sync the entire history of the blockchain. The longer that history is. Ethereum Chain Full Sync Data Size is at a current level of , up from yesterday and down from one year ago. This is a change of %. The GETH client has 3 Blockchain Sync Modes (FAST, FULL or LIGHT). The FAST Sync was used to produce the data chart below using 'Geth v stable'.