As some client connections could have been established (but not accepted) during the previous poll(), the current client connection list can have more than one item.

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- Avoid have a 'break' at the first level and the end of the 'wile True'
- Set try/except block around the only location where the exception can be raised.
- Reduce indentation
- Clarify that the loop purpose is to restart when an exception is raised.

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UnexpectedPacketError should not be used for an invalid but expected packet type.

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UnexpectedPacketError is triggerred in BaseHandler.

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Add a test for conflict resolution.

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NotifyTransactionFinished is misspelled, it is an answer packet.
Similary, UnlockInformation is a notification, not a request.

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There is no need to store the master address list out of the node manager, any master found in configuration is loaded in the node manager and can be retreived by it if needed.
Remove redundant intialization code in test module, master nodes are created at app initialization.

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A storage must never send this packet to the master node. The master has a view of all nodes and detect itself any breakage.

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Fit better with the implementation, when a node is identified to the master, it got an entry in the node manager.

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This behaviour was probably lost with the master's handler split and was found by fixing unit tests.
During recovery, if a node is lost it's state is updated but not propagated to other (storages) nodes because after the recovery they will all retreive the whole node list.

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Send an error to the storage node if the partition table sent is invalid instead of killing the master.

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