zrepl 0.6.1 reporting "callback channel is full" -- annoying warning or something serious? #844

gdevenyi · 2024-10-28T14:11:48Z

gdevenyi
Oct 28, 2024

My syslog regularly reports this message from zrepl

Oct 28 02:43:50 cicss05 zrepl[2757610]: [cicss05_to_cicss06][snapshot][/gth$ouJw$oNrA$oNrA./YcN]: callback channel is full, discarding snapshot update event

I'm running a pretty standard "snapshot and push replicate" job

global:
  logging:
    # use syslog instead of stdout because it makes journald happy
    - type: syslog
      format: human
      level: warn

jobs:
- name: cicss05_to_cicss06
  type: push
  replication:
    concurrency:
      steps: 4
      size_estimates: 8
  connect:
    type: tls
    address: "cicss06:8888"
    ca: /etc/zrepl/cicss06.crt
    cert: /etc/zrepl/cicss05.crt
    key:  /etc/zrepl/cicss05.key
    server_cn: "cicss06"
  filesystems: {
    "<": true,
    "data": false,
    "data/scratch2": false
  }
  snapshotting:
    type: periodic
    prefix: zrepl_
    interval: 15m
  pruning:
    keep_sender:
    - type: not_replicated
    - type: grid
      grid: 1x1h(keep=all) | 24x1h | 30x1d | 6x30d
      regex: ".*"
    keep_receiver:
    - type: grid
      grid: 1x1h(keep=all) | 30x1d | 3x30d
      regex: ".*"

Is this something to be concerned with?

problame · 2024-11-04T10:07:51Z

problame
Nov 4, 2024
Maintainer

The message means that replication was running when the snapshot was taken.
Either replication triggered by previous snapshot was still running.
Or replication was triggered manually via zrepl signal and the snapshot was taken by scheduled while that triggered run was running.

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zrepl 0.6.1 reporting "callback channel is full" -- annoying warning or something serious? #844

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zrepl 0.6.1 reporting "callback channel is full" -- annoying warning or something serious? #844

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gdevenyi Oct 28, 2024

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problame Nov 4, 2024 Maintainer

gdevenyi
Oct 28, 2024

problame
Nov 4, 2024
Maintainer