PAB not synchronizing with chain-index for testnet

[kelizarov]

Is there an existing issue for this?

• I have searched the existing issues

Summary

After launching all necessary components of cardano-node, cardano-wallet and plutus-chain-index and making sure that node's and chain-index's tip are synced with the testnet, the PAB process just hangs indefinetly without printing any messages that it is synced or being synced with chain-index.

The instruction were followed as described here with only difference that cardano-node and cardano-wallet executables were downloaded from hydra.

Steps to reproduce the behavior

1. Launch cardano-node, cardano-wallet and plutus-chain-index as described in instruction
2. Wait until everything is synced with the testnet.
3. Launch PAB with test contract.

Actual Result

PAB does not print messages about sync with chain-index. It only prints first 3 messages.

[pab:Info:4] [2021-12-06 06:59:37.95 UTC] Restoring PAB state ...
[pab:Info:4] [2021-12-06 06:59:37.95 UTC] No constract instance were restored in the PAB state.
[pab:Info:4] [2021-12-06 06:59:37.95 UTC] Starting PAB backend server on port 9080

Expected Result

PAB starts printing messages like this

...
Current block: 327295. Current slot: 41749136.
Current block: 327295. Current slot: 41749150.

What have you tried to resolve this issue?

Tried clean setup of cardano-node DB.
Restarted PAB with removed DB file that it creates.
Tried latest revision of plutus-apps at main

Checked our docs?

• Yes, I have looked in the the readme, plutus docs, and technical report for help on this issue.

Checked Stack Exchange?

• Yes, I have searched Stack Exchange for this issue and it doesn't exist.
• I have considered raising this issue in Stack Exchange.

System info

Versions that were used:

cardano-node --version
cardano-node 1.30.1 - darwin-x86_64 - ghc-8.10
git rev 0fb43f4e3da8b225f4f86557aed90a183981a64f

cardano-wallet version
v2021-11-11 (git revision: dac16ba7e3bf64bf5474497656932fd342c3b720)

for plutus-apps I've used plutus-starter-devcontainer/v1.0.14 tag.

My machine is MacOS 12.0.1 (21A559)

Screenshots and attachments

No response

[kelizarov]

I also noticed: when I try to launch PAB with prepared chain-index the cardano-node shows these messages:

[Yasuke]

Hey @kelizarov thank you for your submission, I will take a look into your synchronization issue.

[raduom]

What exactly is the synchronisation issue?

a) It takes too much time? - Currently implementing a workaround.
b) It takes too much RAM? - Currently implementing a workaround.
c) No feedback on the PAB synchronisation with the node.

[kelizarov]

Hey,

1. I haven't reached the completion. In the tutorial they've mentioned that PAB instance should have been logging the sync status, like this:

...
Current block: 327295. Current slot: 41749136.
Current block: 327295. Current slot: 41749150.

but I've haven't seen it.
2. Yes, I've left PAB running over-night and the instance consumed over >10Gbs of RAM.
3. The cardano-node has been producing errors like in the attached screenshot I've posted earlier here.

[raduom]

1. We will look into it.
2. We will have a tentative fix for that, probably this week.
3. We are also looking into that so it will be fixed soon.

[kelizarov]

I also noticed: when I try to launch PAB with prepared chain-index the cardano-node shows these messages:

Can anyone tell me the reason what could cause these logs when launching PAB? I'm still getting it with v2021-12-20 version.

[raduom]

It may be connected to: #120. A fix for it is in the works and it will probably be merged at the beginning of next year. However, it should not affect the correctness of your contracts (the functionality that may be affected is calls to getCurrentSlot within your contracts).

[kelizarov]

Can confirm that PAB works with fd9e2f0ede0b476dcfac1f7c71f2377b4002e6b6 commit. pabRollbackHistory helps to ease the synchronisation process.