InfluxDB 2.17.11 repeatedly showing “internal error not returned to client” / “context canceled” warnings

1

I’m running InfluxDB 2.17.11 on Windows Server 2022 with the TSM storage engine.
InfluxDB is connected to Telegraf and Grafana, and it works, but I keep seeing the following warning messages repeatedly in the InfluxDB logs:

2025-10-25T06:19:40.974137Z lvl=warn msg=“internal error not returned to client” log_id=0zjnDX1W000 handler=error_logger error=“context canceled”

Sometimes these occur every few seconds, even when system resources appear normal. Grafana panels occasionally take longer to refresh.

System Details

  • InfluxDB version: 2.17.11

  • OS: Windows Server 2022

  • Storage engine: TSM

  • Connected clients: Telegraf and Grafana

  • Load: ~3000 tags
    interval = “15s”
    round_interval = true
    metric_batch_size = 1000
    metric_buffer_limit = 40000
    collection_jitter = “7s”
    flush_interval = “10s”
    flush_jitter = “7s”

  • What I’ve Tried

    • Restarted InfluxDB and Telegraf services

    • Verified that both services are reachable over the network

    • Checked CPU, memory, and disk I/O — all are within normal ranges

    • Verified no large query load from Grafana

    • Questions

      1. What exactly triggers the context canceled warning in InfluxDB 2.17.11?

      2. Does it indicate dropped writes, canceled queries, or client disconnections?

      3. Are there any InfluxDB configuration parameters (timeouts, write buffer sizes, or query limits) that can be tuned to prevent this?

      4. Could the Telegraf batch or jitter settings contribute to this issue under moderate load (3000 tags, 15s interval)?

      Goal

      To identify and fix the root cause of these recurring warnings so the system runs cleanly under load and avoids potential data loss or query interruptions.

2

The “context canceled” warning typically means a client (Telegraf or Grafana) disconnected or timed out before InfluxDB finished processing their request. To fix it, increase timeout settings in your InfluxDB config (like http-read-timeout and http-write-timeout from 15s to 60s or higher) and try to increase Telegraf’s metric_buffer_limit to handle load spikes better.