Tim Burke e09c4ee780 Allow concurrent bulk deletes ...

Before, server-side deletes of static large objects could take a long
time to complete since the proxy would wait for a response to each
segment DELETE before starting the next DELETE request.

Now, operators can configure a concurrency factor for the slo and bulk
middlewares to allow up to N concurrent DELETE requests. By default, two
DELETE requests will be allowed at a time.

Note that objects and containers are now deleted in separate passes, to
reduce the likelihood of 409 Conflict responses when deleting
containers.

Upgrade Consideration
=====================
If operators have enabled the bulk or slo middlewares and would like to
preserve the prior (single-threaded) DELETE behavior, they must add the
following line to their [filter:slo] and [filter:bulk] proxy config
sections:

   delete_concurrency = 1

This may be done prior to upgrading Swift.

UpgradeImpact
Closes-Bug: 1524454
Change-Id: I128374d74a4cef7a479b221fd15eec785cc4694a

2016-05-23 21:38:45 -07:00

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