Parity often sync failed. It recover when I restart parity.

[garysdevil]

• OpenEthereum version: Parity-Ethereum/v2.5.13-stable-253ff3f-20191231/x86_64-linux-gnu/rustc1.40.0
• Operating system: Linux
• Installation: one-line installer
• Fully synchronized: yes
• Network: kovan
• Restarted: yes
  My config:
  

Problem: Sync failed.
Phenomenon：

Recovery method: I need to restart parity every time it stop sync.
I need to restart parity for recovery every time I found it sync failed, which disturb me..
How to solve this question? And why happend this?

[vorot93]

Can you back up the database and try to sync with 2.7.2? And with master?

[garysdevil]

Can you back up the database and try to sync with 2.7.2? And with master?

I feel puzzled at this reply "try to sync with 2.7.2? And with master?".
I don't know how to operate it, can you say it detailly?

[vorot93]

Download Parity-Ethereum 2.7.2 and try again with this version.

If the error persists, build the source code from the master branch, and try running it instead.

[garysdevil]

Download Parity-Ethereum 2.7.2 and try again with this version.

If the error persists, build the source code from the master branch, and try running it instead.

Thank you. I update parity version to 2.7.2 directly and still use old db. Is it work?
It is output log below:

[vorot93]

OpenEthereum v3.0.0 has been released, try with it as well.

[garysdevil]

OpenEthereum v3.0.0 has been released, try with it as well.

I will try it lately.
I deployed parity 2.7.2 completely yesterday, which sync normally .
Howere "Not preparing block; cannot sign." occure again torday!

[dvdplm]

"Not preparing block; cannot sign."

This just means that you are not a validator and you are not producing blocks. It's not an error.

[adria0]

@dvdplm, the Not preparing block; cannot sign. is a warn!, is sane to we downgrade this to debug! or trace!?"

[dvdplm]

is sane to we downgrade this to debug! or trace!?"

Yeah, let's do that. :)

[garysdevil]

"Not preparing block; cannot sign."

This just means that you are not a validator and you are not producing blocks. It's not an error.

Thank you.
Howere, it is still sync slow than "https://kovan.etherscan.io/blocks"
The last sync log:
2020-05-14 07:39:26 Imported #18512828 0x473a…8b32 (4 txs, 0.16 Mgas, 546 ms, 1.16 KiB) + another 4 block(s) containing 59 tx(s)
It stop sync again:

https://kovan.etherscan.io/blocks: 18513164

[garysdevil]

@dvdplm, the Not preparing block; cannot sign. is a warn!, is sane to we downgrade this to debug! or trace!?"

Why not this warning is only displayed when it is vaidator?

[kael-shipman]

Cross-referencing potentially related issues:

• Node has stopped synchronization but still responses on some RPC requests. #11793
• Client occasionally stops importing new blocks #11758
• Openethereum node stopped importing blocks #11737

[vorot93]

Looks like #11758.