Topic: Electrum server discussion thread - page 4. (Read 61487 times)

Trying to get an electrum server up and running but get following error in logs

INFO:root:ElectrumX server starting
INFO:BlockProcessor:switching current directory to /home/kipper01/.electrumx/db
INFO:BlockProcessor:reorg limit is 200 blocks
Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/electrumx-0.9.19-py3.5.egg/EGG-INFO/scripts/electrumx_server.py", line 68, in main
  File "/usr/local/lib/python3.5/dist-packages/electrumx-0.9.19-py3.5.egg/EGG-INFO/scripts/electrumx_server.py", line 49, in main_loop
  File "/usr/local/lib/python3.5/dist-packages/electrumx-0.9.19-py3.5.egg/server/protocol.py", line 58, in __init__
    self.bp = BlockProcessor(env)
  File "/usr/local/lib/python3.5/dist-packages/electrumx-0.9.19-py3.5.egg/server/block_processor.py", line 161, in __init__
    super().__init__(env)
  File "/usr/local/lib/python3.5/dist-packages/electrumx-0.9.19-py3.5.egg/server/db.py", line 54, in __init__
    self.reopen_db(True)
  File "/usr/local/lib/python3.5/dist-packages/electrumx-0.9.19-py3.5.egg/server/db.py", line 86, in reopen_db
    self.db = open_db(db_name, self.env.db_engine, max_open_files)
  File "/usr/local/lib/python3.5/dist-packages/electrumx-0.9.19-py3.5.egg/server/storage.py", line 24, in open_db
    return db_class(name, for_sync)
  File "/usr/local/lib/python3.5/dist-packages/electrumx-0.9.19-py3.5.egg/server/storage.py", line 34, in __init__
    self.open(name, create=self.is_new, for_sync=for_sync)
  File "/usr/local/lib/python3.5/dist-packages/electrumx-0.9.19-py3.5.egg/server/storage.py", line 85, in open
    max_open_files=mof, compression=None)
  File "_plyvel.pyx", line 236, in plyvel._plyvel.DB.__init__ (plyvel/_plyvel.cpp:3129)
  File "_plyvel.pyx", line 80, in plyvel._plyvel.raise_for_status (plyvel/_plyvel.cpp:1698)
plyvel._plyvel.IOError: b'IO error: lock Bitcoin-mainnet/LOCK: Resource temporarily unavailable'
CRITICAL:root:ElectrumX server terminated abnormally

ElectrumX is pretty stable and fast. It is now linked from electrum.org, in replacement of electrum-server

Some interesting things brewing in the world of electrum servers...

ElectrumX announced and showing potential.

Fireduck is back to hacking away (in his spare time) on Jelectrum

I'll give it a try tonight.  It continues to fall further behind bitcoind, so I have to try something.  I'll report back tomorrow.  Thanks for the suggestion.

The thing is slow. In my experience it take a lot more resources than bitcoind per block to digest. Maybe the insert into the patricia tree (?) utxo data structure is to blame? I wouldn't know.

There was an alternative implementation mentioned further up (in java?). I've been wanting to give it a try, but there's no pressure (the machine I use for electrum server has plenty of juice). Maybe you can try it and report back?

EDIT: found the post:

Hi All,

I'm trying to get a new electrum server started, but it doesn't seem to sync all the way with bitcoind.  Bitcoind is up to the latest block, but electrum server is almost 1000 blocks behind it and falling further behind.  At one point it was 941 blocks behind, then 966 blocks behind, ...

Edit: Can it take that much longer to process via electrum than to keep up with the blockchain with bitcoind?  That is, if the hardware can keep up with bitcoind with lots of CPU and RAM to spare, shouldn't it be possible for electrum-server to catch up?  The log just shows it dropping further and further behind.  Perhaps I'm just missing something here?

run run_electrum_server.py in user:
INFO:electrum:reorganizing, a block in file is orphaned: af995b0c0f6b73250c877899ada43a2cb9ff9f6cfcbb98fe4235581562f1b97a

root@iZ94bc81uuyZ:~# electrum-server start
Server already running (pid Do not run this program as root!
Run the install script to create a non-privileged user.)

maybe anyone knows an alternative spv wallet + server for it that can be easily started from docker or complete script?

Any knows or have a good reference on starting electrum-server in regtest mode? I tried to setup it in VM but the installation steps are outdated, at least for Ubuntu - fails on `python setup.py install` step. Optionally if anyone knows updated electrum-server docker image?

There are plenty of servers to satisfy the current number of clients.  If anything, I am probably going to shut down a server or two as the load is negligible.

The Electrum developers will probably tackle that if it ever becomes a problem, don't worry

If you want a network that will pay the w nodes rather than only the miners.   Then you have dash.   Otherwise we can fork the client source code to pay to the electrum server as well as the miner fee.  Only people who are both savvy enough to use github and who care about the electrum server count enough would ever use such a client though.  There are other light clients out there that don't use electrum servers.   These clients have to do more work.

I am concerned about transactions with 0.1mBTC for a transaction not getting through.  If the user must add another 0.1mBTC, the users might decide to go with some other light client.   

sdp

OK, thank you
However, aren't 50 server a bit few?
I mean, I didn't have performance problems up to now, but in the future?

Indeed.

And with that one I can then send my BTC to a non-light wallet, by making a last transfer from Electrum to another BTC address, right?

If all 50 servers disappear, you can still set up your own

The fact that there are less than 50 servers scares me quite a bit.
What happens if all the Electrum servers go offline?

thanks for the info/link... might come in handy.

Fireduck re-wrote electrum-server in Java and it processes blocks much faster than the original Python version.
See https://bitcointalksearch.org/topic/java-electrum-server-jelectrum-726338