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ftp: add notes on how to avoid deadlocks with concurrency - fixes #6370

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This commit is contained in:
Nick Craig-Wood 2022-08-11 16:45:21 +01:00
parent f279e4ab01
commit d08ed7d1e9
1 changed files with 16 additions and 2 deletions
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18
backend/ftp/ftp.go
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@ -81,8 +81,22 @@ security from the server in order to upgrade a plain text connection
to an encrypted one. Cannot be used in combination with implicit FTP.`,
Default: false,
}, {
Name: "concurrency",
Help: "Maximum number of FTP simultaneous connections, 0 for unlimited.",
Name: "concurrency",
Help: strings.Replace(`Maximum number of FTP simultaneous connections, 0 for unlimited.
Note that setting this is very likely to cause deadlocks so it should
be used with care.
If you are doing a sync or copy then make sure concurrency is one more
than the sum of |--transfers| and |--checkers|.
If you use |--check-first| then it just needs to be one more than the
maximum of |--checkers| and |--transfers|.
So for |concurrency 3| you'd use |--checkers 2 --transfers 2
--check-first| or |--checkers 1 --transfers 1|.
`, "|", "`", -1),
Default: 0,
Advanced: true,
}, {