Commit 062cbecc authored by Jim Fulton's avatar Jim Fulton

If vote fails with a conflict error, invalidate the corresponding cache entry

This used to happen via the server calling serialnos, but ZEO 5
servers no longer do this.  For the reason for invalidating the cache
entry, see the new comment.
parent 01cda6b4
......@@ -725,7 +725,20 @@ class ClientStorage(object):
"""Storage API: vote on a transaction.
"""
tbuf = self._check_trans(txn, 'tpc_vote')
try:
self._call('vote', id(txn))
except POSException.ConflictError as err:
oid = getattr(err, 'oid', None)
if oid is not None:
# This is a band-aid to help recover from a situation
# that shouldn't happen. A Client somehow misses some
# invalidations and has out of date data in its
# cache. We need some whay to invalidate the cache
# entry without invalidations. So, if we see a
# (unresolved) conflict error, we assume that the
# cache entry is bad and invalidate it.
self._cache.invalidate(oid, None)
raise
if tbuf.exception:
raise tbuf.exception
......
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