multi backup error #2285
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Reference: tahoe-lafs/trac-2024-07-25#2285
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When performing two backups at once (tahoe backup) one of them crashed
with a stack traceback ending in this error:
OperationalError: database is locked
I was running tahoe-lafs in Tails from wheezy-backports :
See also #2062.
I'll bet we could fix this simply by setting PRAGMA busy_timeout to a large value (like 3000 milliseconds). This would, if I understand correctly, cause the second one of the
tahoe backup
processes that attempted to write to a table to block until the first one finished its write and committed the transaction. This would only take a tiny fraction of a second (especially if we turned onjournal_mode="WAL"
andsynchronous="NORMAL"
, like we do in the leasedb branch).The only question I have is: how would we test a patch which made this change!
Replying to zooko:
I think that's correct.
I wouldn't mind having the test just check that the intended pragmas are set (it should also check the existing pragmas, which I don't think are currently tested).