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Oct 15, 2009, 11:15 AM
Post #1 of 1
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[Bug 4642] concurrency problem in the PostgreSQL specific Bayes-module
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https://issues.apache.org/SpamAssassin/show_bug.cgi?id=4642
--- Comment #1 from Mark Martinec <Mark.Martinec [at] ijs> 2009-10-15 11:15:58 UTC ---
> However the approach used is subject to a racecondition in the case of multiple
> clients learning mails with similiar tokens (multiple spamds or sa-learns),
> because it might happen that a new token gets inserted(and commited) after the
> function got called but before it tries the insert resulting in the following
> error message in the postgresql log:
Btw, the same problem occurs in SQL-based AWL backend: process A does a SELECT
and does not find any entries, meanwhile process B does the same and INSERTs
its record, and when later process A tries to do its own INSERT (instead of
UPDATE), the SQL operation fails due to a key constraint.
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