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Add steps to get lightning goroutine #6001

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Aug 12, 2021
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Add steps to get lightning goroutine #6001

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Add steps to get lightning goroutine
Jul 19, 2021
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Liuxiaozhen12 Aug 5, 2021
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16 changes: 16 additions & 0 deletions tidb-lightning/tidb-lightning-faq.md
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Expand Up @@ -348,3 +348,19 @@ This error occurs usually because the CSV data file does not contain a header (t
[mydumper.csv]
header = false
```

## How to get the runtime goroutine information of TiDB Lightning

1. If [`status-port`](/tidb-lightning/tidb-lightning-configuration.md#tidb-lightning-configuration) has been specified in the configuration file of TiDB Lightning, skip this step. Otherwise, you need to send the USR1 signal to TiDB Lightning to enable `status-port`.

Get the process ID (PID) of TiDB Lightning using commands like `ps`, and then run the following command:

{{< copyable "shell-regular" >}}

```sh
kill -USR1 <lightning-pid>
```

Check the log of TiDB Lightning. The log of `starting HTTP server` / `start HTTP server` / `started HTTP server` shows the newly enabled `status-port`.

2. Access `http://<lightning-ip>:<status-port>/debug/pprof/goroutine?debug=2` to get the goroutine information.