Mercurial > p > roundup > code
annotate roundup/exceptions.py @ 6565:2c2dbfc332ba
Try to handle multiple connections better.
The session database is a hot spot. When multiple requests (e.g. 20)
come in at the same time session database contention can get great.
The original code didn't retry session database access when the open
failed. This resulted in errors at the client.
The second pass delayed 0.01 seconds and retried. It was better but we
still had multiple second stalls. I think the first request got in,
everybody else backed up and then retried at the same time. Again they
stepped on each other. With logging I would see many counters go all
the way to low single digits or to -1 indicating falure.
This pass uses randomint to generate delays from 0-.125 seconds in 5ms
increments. This performs better in testing. I rarely saw a counter
less than 13 (2 failed retries). Current logging starts after 6
failures and counts down until success or failure.
| author | John Rouillard <rouilj@ieee.org> |
|---|---|
| date | Thu, 16 Dec 2021 20:02:00 -0500 |
| parents | c177e7128dc9 |
| children | e16b7d47fdb2 |
| rev | line source |
|---|---|
| 4083 | 1 """Exceptions for use across all Roundup components. |
| 2 """ | |
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3 |
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4 __docformat__ = 'restructuredtext' |
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7 class RoundupException(Exception): |
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8 pass |
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9 |
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10 class LoginError(RoundupException): |
| 4083 | 11 pass |
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14 class Unauthorised(RoundupException): |
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17 class RejectBase(RoundupException): |
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18 pass |
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20 class Reject(RejectBase): |
| 4083 | 21 """An auditor may raise this exception when the current create or set |
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22 operation should be stopped. |
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23 |
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24 It is up to the specific interface invoking the create or set to |
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25 handle this exception sanely. For example: |
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26 |
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27 - mailgw will trap and ignore Reject for file attachments and messages |
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28 - cgi will trap and present the exception in a nice format |
| 4083 | 29 """ |
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30 pass |
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31 |
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32 |
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33 class RejectRaw(Reject): |
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34 """ |
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35 Performs the same function as Reject, except HTML in the message is not |
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36 escaped when displayed to the user. |
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37 """ |
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38 pass |
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39 |
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40 |
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41 class UsageError(ValueError): |
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42 pass |
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43 |
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44 # vim: set filetype=python ts=4 sw=4 et si |
