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Delivered in Summer 16
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Provide Reliable/Guaranteed Message Delivery for Streaming API


The streaming API doesn't guarantee durability and reliable delivery of change data messages to the streaming client.
Streaming servers don't keep any client state and don't keep track of what's delivered. Messages may be lost for a variety of reasons, including:
•    When a client first subscribes or reconnects, it doesn't get messages that were processed while it was not subscribed to the channel.
•    If a client disconnects and starts a new handshake, it may be working with a different application server, so it receives only new messages from that point on.
•    Some events may be dropped if the system is being heavily used. •    If an application server is stopped, all the messages being processed but not yet sent are lost.

The idea: Fix this and implement reliable messaging over the Streaming API between SFDC and the client.

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