Also, fix _load error message, as only data inconsistency can lead to -1
error code now (and it is set locally).

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There is nothing to clean on the master side when a client abort a
transaction.

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Master transactions objects are instanciated during the finish phase only,
which means that any transaction known by the master is being committed.

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FileStorage.copyTransactionsFrom doesn't have a verbose parameter in its
latest version.

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Avoid switching to an unexpected interpreter after forking.

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This has been deprecated at least in Zope 2.8.8, maybe earlier.

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Also, reverts r2197, as it is unclear what bug it was trying to fix, and it
doens't seem required (there is no call to Replicator.act() outside of
doOperation).

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This causes garbage collection problems, as BaseConnection instances also
hold a reference to HandlerSwitcher instance. It is unclear why it fails,
as microbenchs show this should not be a problem for gc.
Also, move loggers out of HandlerSwitcher.setHandler to avoid passing a
connection parameter just for them.

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It is more efficient to provide a boundary value than a row count range.
This fixes replication on partitions with a large number of objects, revisions
or transactions: query time is now constant where it used to increase, causing
timeout problems when query duration exceeded ping time + ping timeout (11s
currently).

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Previous name was too close to the regular-user SQL connection getter.
Also, prevent subclasses from calling it.

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This made it impossible to detect when a storage didn't contain an object.

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It is not possible to move them out of container loop, as tid is a loop
variable.

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Also, stop using a dict in an inefficient way, and replace it by a set.

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Also, factorises packet creation.

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onConnectionClosed is already called inside Connection.close() when peer
is identified (via setOnClose). Calling it here would trigger an exception
as it verifies that _connection is set before un-setting it.
As a replacement, verify that _connection is not set when
Connection.close() returns (so onConnectionClosed was actually called).

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