Questions tagged [synchronization]

Syntonization is the process where your node / client (geth, Ethereum Wallet, etc) receives the most up to date data from the Ethereum blockchain.

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95
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2answers
86k views

What is Geth's “fast” sync, and why is it faster?

One of the answers to this question suggested using Geth's --fast flag to help quickly synchronise the block data. How does the flag work, and how does using it speed up the synchronisation? Are we ...
71
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9answers
92k views

Help with very slow mist sync

I have seen other posts in reddit where users experienced slow sync times. I am using windows 10 and version 3.7 (I saw on gitter that other users on windows 10 had trouble with version 3.8 crashing). ...
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5answers
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How can I get a geth node to download the blockchain quickly?

I'm running a geth node on slow hardware. At the current rate of progress it could be several days before I can download all the blockchain. Is there a way to get it to synchronise more quickly?
46
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1answer
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What is Geth's “light” sync, and why is it so fast?

This question is in a similar vein to the past questions about geth --fast and parity --warp. There was a recent question where the OP wanted to do as little syncing as possible, and one of the ...
37
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10answers
27k views

How can I find out what the highest block is?

I'm syncing up a new node. How can I find out what the latest block is so that I know how far I've got to go?
31
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6answers
41k views

How long is the first sync supposed to last?

I've been running Geth (latest version) for around 12 hours and it's still not finished. The command prompt shows this : INFO [05-21|12:05:00] Imported new chain segment blocks=1 txs=...
28
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6answers
23k views

How to check my sync status on Geth 1.5.5, Raspberry Pi 3

Have a Geth 1.5.5 node running on a raspberry pi 3. When I type in sudo systemctl status geth I'll get ever changing time and block information. Neat, but how do I know when I am synced up? Is ...
28
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4answers
25k views

Can I download the whole blockchain from somewhere?

Bitcoin used to offer sharing/downloading a bootstrap.dat which contains the whole blockchain. Are there alternatives to getting it trickling through the peer-to-peer network? Can I just download it ...
25
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2answers
44k views

Why is my node synchronization stuck/extremely slow at block 2,306,843?

Using macOS 10.12.1 with Ethereum Wallet 0.8.7, nodes are connected but Sync doesn't even start. Stuck at block 2,306,843. What can I do? Please keep in mind, I am neither a coder nor a tech geek.
24
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1answer
29k views

Geth node starts to sync from the beginning after fast sync

I have synced using the --fast command. Now how should I proceed? I tried stopping it, and then running geth --rpc but it says: Last Header #1311471 Last Block #0 Fast Block #1310224 What should I ...
23
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4answers
16k views

How can I empty the blockchain?

I am trying to do a fast sync using geth --fast but I am getting this message: blockchain not empty, fast sync disabled How can I empty the blockchain to allow for fast sync?
22
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1answer
7k views

What is Parity's “warp” sync, and why is it faster than Geth “fast”?

A follow-up of one of the classic questions on this site: One of the answers to this question suggested using Geth's --fast flag to help quickly synchronise the block data. Now, parity comes with ...
20
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1answer
3k views

Difference between a pruned and unpruned blockchain

At the Berlin Blockchain Meetup, Gustav Simonsson teased the Homestead release coming soon (tm) and we were discussing blockchain bloat and the current size of the Ethereum blockchain. We discussed ...
19
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3answers
6k views

What is knownStates?

I am using geth client (VERSION: 1.4.12-stable-421df866) to sync to the Ethereum testnet. To check the status of the sync, I ran web3.eth.syncing in the geth console. This is the output I see: { ...
17
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3answers
16k views

How can i tell if geth is done running?

Well i am new trying to mine and i did the "C:>geth --rpc" and its still going how will i know when its done? i did all the steps leading to this but my pc just keeps running the INFO [05-18|23:32:...
17
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4answers
7k views

Synchronisation failed, dropping peer

Whenever I attempt to run geth on the command line, it seems to have trouble syncing with the blockchain. I am absolutely a novice so I could be completely overlooking. I am getting these warnings ...
16
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2answers
9k views

What is the parity light pruning mode?

Parity offers four different pruning methods: archive, basic, fast and light: --pruning METHOD Configure pruning of the state/storage trie. METHOD may be one of ...
16
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3answers
10k views

What's the proper way to wait for a transaction to be mined and get the results? [duplicate]

I'm using react to write the frontend for my dApp, and doing this to (attempt to) update react's state via an asynchronous sendTransaction call: var thisJS = this web3.eth.sendTransaction({from: ...
16
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4answers
18k views

Possible to store the blockchain in a different directory?

I'm running geth on Linux within a Chromebook. The blockchain is being stored within ~/.ethereum, along with other important files. Problem is, the storage capacity on my Chromebook is quite limited ...
16
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2answers
10k views

How much faster is it to sync with --jitvm?

geth help has: VIRTUAL MACHINE OPTIONS: --jitvm Enable the JIT VM The impact of --jitvm has been unanswered and I'm looking for answers to these 3 specifically: How much faster is geth ...
15
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0answers
4k views

What is the difference between “geth” and “geth --fast”? [duplicate]

EDIT : I hadn't see the other question but this one ain't a duplicate because I'm asking here, precisely, if the state differs and if it does, what are the implications. The answer to that question ...
14
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2answers
8k views

How to reduce chaindata database size?

Currently chaindata size is more then 10.02 GB. Is there any solution to reduce the size of stored data? Is there a way to store particular database and keep entirely the functionality of client (e.g....
14
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3answers
7k views

Why doesn't my Ethereum node have any peers?

I'm running an Ethereum node using geth and it can't find any peers. I've already tried the time sync command suggested on the wiki. My bandwidth is good.
12
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6answers
22k views

Is there a quicker way than geth --fast to download the Ethereum blockchain?

I had the Mist client installed, but it hadn't been updated in a few weeks so I tried renaming the chaindata folder (instead of deleting it) and downloading the blockchain with geth --fast as that is ...
12
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1answer
4k views

Why isn't fast sync the default?

As I understand, fast sync has all the security guarantees of a full sync, but is faster. Is that correct? If so, why isn't fast sync the default?
12
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3answers
18k views

how do you know your db is synced in geth?

In order to answer this question there is a need to get the timestamp of when the database is synced with geth. I can think of two ways of doing that : find the 1st occurrence of 1 block in the geth ...
12
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3answers
4k views

Geth disk and memory performance analysis

A week ago I started a synchronization of a geth node with these parameters: --fast --cache=1024 --rpc --rpcaddr "0.0.0.0" --ws --wsaddr "0.0.0.0" --wsorigins="*" The result that I have obtained is ...
11
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3answers
850 views

Syncing ethereum testnet

I'm syncing my geth client with ropsten testnet and just realized how slow is the syncing process after a certain block(trying to retrieve information from blocks that got in blockchain yesterday) for ...
10
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2answers
6k views

Fatal: Could not open database: resource temporarily unavailable

I get this error when I run the geth upgradedb command: I0317 08:29:57.792433 4202 chaincmd.go:137] Upgrading blockchain database I0317 08:29:57.792491 4202 database.go:71] Alloted 16MB cache ...
10
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2answers
6k views

Corruption on data-block while synchronising

My home server's been down for a couple of days while I do some upgrades. I'd had Geth running in one of the terminal windows, but shut it down gracefully using exit before taking the server offline. ...
10
votes
1answer
2k views

Can I run Geth without syncing?

I want to test some api calls using web3.js and so I am using geth as HttpProvider. Can I start geth without the syncing? Is something like geth --nosync --rpc available?
10
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1answer
5k views

How do I find out how big the chain structure is for a particular block?

I'm downloading the blockchain from scratch, and it's been stuck at 2442432 for a couple of hours now. The chain structure keeps on downloading though. Is there a way to find out how much of that is ...
9
votes
1answer
4k views

Ethereum wallet keeps redownloading entire blockchain

I'm having serious problems with my wallet. I was running fine up until a couple of weeks ago, then when opening the wallet I was asked to update. I did, and ever since I've had nothing but trouble. ...
9
votes
1answer
3k views

“retrieved ancestor invalid” message during synchronization

We have been running a private ethereum network for a couple of months. Today we tried to add a new node to the network. When the node was synchronizing, (after 3-4 hours) it stopped with the ...
9
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2answers
1k views

Persistent “deep transaction reorg” whilst syncing full geth node

Whilst syncing a new full node using the geth comand "geth --syncmode full", every other line after a few hundred blocks I see the following: WARN [12-02|02:30:46] Skipping deep transaction reorg ...
8
votes
5answers
9k views

Sent ETH to my Wallet, but it did not show up

Note: This question was initially asked for Mist, but is in general also true for all other wallets like Ethereum Wallet, Etherwall, Parity, Harmony, etc. I sent ETH from MyEtherWallet to my Mist ...
8
votes
3answers
15k views

Ethereum Node Stuck, Can't Sync

I'm using a Macbook Pro OS X Version 10.9.5 and am unable to get through the syncing phase. "Ethereum node needs to sync, please wait..." is exactly what is prompt but regardless of the time I wait, ...
8
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2answers
3k views

Is there any SPV client for ethereum?

I am looking to move some ETH from an exchange to a wallet for which I control the keys. I don't, however, want to download the whole blockchain. Is there a good SPV client I can use?
8
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2answers
505 views

Can you accessing blockchain data while offline (not synced), and is it a good design option?

Consider an application that currently uses a combination of license file and/or subscription to verify which features to activate. I can use a smart contract instead of the license file, and ...
8
votes
1answer
2k views

Can one use ethereum as a client over Tor?

Does ethereum work when there is only TCP available? Can one use ethereum as a client over Tor? It does not work for me. Using Whonix. So running the traffic over Tor is not an issue. Blockchain ...
8
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2answers
3k views

What does mean “Failed to retrieve current release”?

When I start with geth with light syncmode, I get the following error message: ERROR[date] Failed to retrieve current release err="can't fetch trie key ...
7
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2answers
4k views

Sync blockchain while mining?

I'm new to ether mining. Do I have to sync with the blockchain while mining? Currently I'm using ethminer for solo mining with GPU and geth to sync with blockchain.
7
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2answers
389 views

How can I maximize the probability that my ETH nodes stay synchronized with mainnet for as long as possible?

I run three full ETH nodes, one on my local, home network, and two in the cloud. All three make use of geth. My "local" node, is always in sync with mainnet, i.e. always showing the same last block ...
7
votes
1answer
2k views

What is Geth's JIT VM?

Whilst downloading the blockchain which has taken me approximately a week to get to block 1.09 mil, I received a message from geth.exe after a reboot around 1050999 -1060888 You're one of the lucky ...
7
votes
2answers
1k views

Intermittent Synchronisation failed: no peers to keep download active?

My geth blockchain sync is stalling with the error message: I0323 07:46:09.085264 3027 downloader.go:267] Synchronisation failed: no peers to keep download active I've tried to restart it but it ...
7
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1answer
1k views

Can anyone help guide on running two geth clients on the same box and same network?

I am working on Mac OSX. I have the CL tools installed and I can start one geth client on a private network. Mining works. Wallet features work. I am able to successfully mine eth and deposit it into ...
7
votes
1answer
3k views

Is there a downloadable Ethereum bootstrap?

I am trying to synchronize a full node, and this is going very slowly, the progress alternates between bursts of high CPU usage (which is fine, it is heavy but importing), and long times with nothing ...
7
votes
1answer
2k views

How can I do a fast geth sync without consuming too much memory?

My problem is this. The recommended advice in order for geth to run a faster initial sync is to use the option --fast plus a non-default value for the option --cache. The option --cache appears to be ...
7
votes
1answer
4k views

What is “chain structure”?

When installing wallet + mist v0.8.3 you see something like this: What is meant by "chain structure"? Is the "222 of 4446" just a download progress indicator or does each single part have a meaning?
7
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0answers
2k views

Why is Geth's “fast” sync now the default, whereas before it wasn't?

As of version 1.6.0, the default method used by Geth for syncing the chaindata is "fast": The default sync mode is --syncmode=fast, for full sync please use --syncmode=full. Previously, the ...