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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 | 98e2835b787a |
| children | 24e2eeb2ed9a |
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================ Roundup Glossary ================ class a definition of the properties and behaviour of a set of items classname the name of a class. It must start with a letter, end with a letter or "_", and only have alphanumerics and "_" in the middle. db (or hyperdb) a collection of items designator a combined class + itemid reference to any item in the hyperdb. E.g. issue26. Note that form values can include something that looks like a designator composed of a classname, a dash '-', and a number. E.g. file-1. These are used to create new instances of a class via the web interface. itemid a numeric reference to a particular item of one class item a collection of data that forms one entry in the hyperdb. property one element of data that makes up an item. In Roundup, the set of item properties may be changed as needed - even after the tracker has been initialised and used in production. schema the definition of all the classes that make up an tracker tracker the schema and hyperdb that forms one issue tracker tracker home the physical location on disk of a tracker ----------------- Back to `Table of Contents`_ .. _`Table of Contents`: index.html
