tarantool / crud / 17757349102

89%

master: 88%

Pull #456

github

call: support vshard's request_timeout in read calls

vshard 0.1.28 introduces a new option for read requests:
`request_timeout`.

`request_timeout` serves as a protection against hung replicas. When it
is specified, it must be <= `timeout`, and it introduces new behavior
for router calls: they start retrying TimedOut errors, each time trying
the request on a new replica, as long as `timeout` (the old one)
permits.

Support the option only in crud requests with `mode = 'read'`, since
it makes no sense with `mode = 'write'`. There is no one to retry the
request on if master is unresponsive.

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