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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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It is possible for rid not to be in partition_dict or new_partition_dict,
as this method is called from a master notification (partition changed),
which might happen outside of any replication (so when both dicts are
empty).

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The replicator must be stopped to avoid storages request unfinished
transactions to the master while it is not able to answer. This prevent
from considering the storage as broken.

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If a client connect to a storage more than one time, cut the old connection
and replace it by the new one. This is required if the client reconnect to
fast and the storage handle in single poll loop the new connection *then*
the lost of the previous connection.

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The only purpose on this is to have the log in setHandler() that display the
connection's UUID instead of None.

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Avoid duplicates in deployment configurations.

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With a sample configuration for supervisor.

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About the potential use of twisted framework.

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Since the last OID used (in a transaction) is synchronized with the storages,
it is no more required to restart a NEO cluster after an import. Remove the
related message.

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- A storage is not operational while connecting to the primary master
- A storage is not ready until connected to a primary master, with an
operational partition table and fully initialized. The 'ready' attribute
must be initialized to False when PrimaryFailure or OperationFailure
exceptions are reaised to prevent acceptation of incoming clients (see
storage/handlers/identification.py that check app.ready value)

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- The storages no more check the last OID during a store
- The storages inconditionnaly store the last OID notified by the master
- The master check during the if a greater oid was used by a client
- The master always notify the last OID when a pool is generated or if the
check above is True
- The master's transaction manager manager the last oid and oid generator

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This fix an issue where some locks were not released on a storage because the
node list used to sent abort notifications was built with the content of
data_dict that don't keep informations about unresolved conflicts.

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