The manager kept track of pending (unfinished) transactions initiated by the client nodes and locked by storage nodes.

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- Handle a node list instead of a single node
- Send only one packet per peer, reduce bandwidth and latency
- Remove the related XXX

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MySQLManager.close() is only used in tests where many connections are opened.
In a storage process, the connection is opened only once and kept until it shutdown.

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Now the broadcastPartitionChanges() method check itself the cell_list content.
- If empty, it does nothing.
- If not empty, it generate itself the next PTID and broadcast the changes.

Remove the related XXX.

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- An update means that the item must be already known
- The __call__ replacement for __str__ might be a false good idea
- Module neo.master.test.connector no more exists
- XXX in client/app.py is related to deleted code.

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- Rollback out of a transaction is not an issue with MySQL.
- Any unimplemented packet type must fallback to default handler and raise UnExpectedPacketError exception.

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- Delayed node acceptation
- Verification process review
- Partition table tweaking improvement required
- Node/Connection state review
- Error packet review

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Objects no more related to currently assigned partitions are flushed from relationnal database since implementation of PartitionTable.dropPartition() in r1228.

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See r1356 and followings.

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- Use the client's service handler because of handler split
- Fix use of identifyToMasterNode()
- Set IDs on packets
- Use new-style packet decoding

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- Don't test the case where no UUID is available, this is ensured by identification handler
- When cluster leave operational state, the PTID *must* not change,fix the assertion.

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AskLastIDs, AnswerLastIDs, AskUnfinishedTransactions

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Set an identifier on the packet.

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As client nodes don't keep their UUID between two connections, drop node from memory at disconnection to avoid memory leak.

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The only purpose of BaseServiceHandler is to handler broken/timeout/... events, and this behaviour is required during verification stage to raise VerificationFailure exception when a storage node required is lost. This was found by failing unit tests.

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Only storage nodes are binded to the verification handler, so there no need to check with a master node.
Moreover, initial nodes are set in UNKNOWN state.

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Merge getNextOID() and getNewOIDList() test cases as the implementation does two-in-one.

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When a node notification is received, update() on node manager is now called and the logic is no more in the handler, so remove useless and false checks.

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