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Joshua
wendelin.core
Commits
65a6474e
Commit
65a6474e
authored
Dec 10, 2019
by
Kirill Smelkov
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zrace.py
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65a6474e
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@@ -40,8 +40,7 @@ Below is timing diagram on how the bug happens on ZODB5:
# which T1 queues in its _storage._invalidations
# T1 retrieves queued invalidations which _includes_
# invalidation for transaction that T2 just has committed,
# that goes past @head.
# invalidation for transaction that T2 just has committed past @head.
._storage._lock.acquire()
r = _storage._invalidations
._storage._lock.release()
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@@ -53,6 +52,14 @@ Below is timing diagram on how the bug happens on ZODB5:
._cache.invalidate(invalidated)
The program simulates two clients: one (T2) constantly modifies two integer
objects preserving invariant that their values stay equal. The other client
(T1) constatly opens the database and verifies the invariant. T1 forces access
to one of the object to always go through loading from the database, and this
way if live cache becomes stale the bug is observed as invariant breakage.
XXX ZODB4 and ZODB3
[1] https://github.com/zopefoundation/ZODB/blob/5.5.1-29-g0b3db5aee/src/ZODB/Connection.py#L734-L742
[2] https://github.com/zopefoundation/ZODB/blob/5.5.1-29-g0b3db5aee/src/ZODB/mvccadapter.py#L130-L139
"""
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