The toolkit to pack, ship, store, and deliver container content

Aaron Lehmann 00cca12e77 Improved push and pull with upload manager and download manager ... This commit adds a transfer manager which deduplicates and schedules transfers, and also an upload manager and download manager that build on top of the transfer manager to provide high-level interfaces for uploads and downloads. The push and pull code is modified to use these building blocks. Some benefits of the changes: - Simplification of push/pull code - Pushes can upload layers concurrently - Failed downloads and uploads are retried after backoff delays - Cancellation is supported, but individual transfers will only be cancelled if all pushes or pulls using them are cancelled. - The distribution code is decoupled from Docker Engine packages and API conventions (i.e. streamformatter), which will make it easier to split out. This commit also includes unit tests for the new distribution/xfer package. The tests cover 87.8% of the statements in the package. Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>		2015-12-09 19:13:35 -08:00
docs	Improved push and pull with upload manager and download manager	2015-12-09 19:13:35 -08:00