Also use it instead of a custom ETS table for simplicity and
better consistency. This has drawbacks though: expect slightly
increased load on gproc gen_server due to how `gproc:set_value/2`
works.
Before this change, a separate `manager_id` / `instance_id` was used
as resource manager id, which made connector interface somewhat
inconsistent: part of function calls to connector implementation
used instance id as first argument while the rest used resource id
itself.
Fixes https://emqx.atlassian.net/browse/EMQX-9635
During a sync call from process `A` to a buffer worker `B`, its call
to the underlying resource `C` can be very slow. In those cases, `A`
will receive a timeout response and expect no more messages from `B`
nor `C`. However, prior to this fix, if `B` is stuck in a long sync
call to `C` and then gets its response after `A` timed out, `B` would
still send the late response to `A`, polluting its mailbox.
Fixes https://emqx.atlassian.net/browse/EMQX-9367
For better user experience and performance for the average bridge, we
should change the default queue mode to `memory_only`, as was the
behavior of most bridges in e4.x. This leads to better performance
when message rate is high enough and the remote resource is not
keeping up with EMQX.
Also, we set the default segment size to equal max queue bytes.
Port of https://github.com/emqx/emqx/pull/10154 for `release-50`
Fixes https://emqx.atlassian.net/browse/EMQX-9099
Originally, the `resume_interval`, which is what defines how often a
buffer worker will attempt to retry its inflight window, was set to
the same as the `health_check_interval`. This had the problem that,
with default values, `health_check_interval = request_timeout`. This
meant that, if a buffer worker with those configs were ever blocked,
all requests would have timed out by the time it retried them.
Here we change the default `resume_interval` to a reasonable value
dependent on `health_check_interval` and `request_timeout`, and also
expose that as a hidden parameter for fine tuning if necessary.
Fixes https://emqx.atlassian.net/browse/EMQX-9130
Since buffer workers always support async calls ("outer calls"), we
should decouple those two call modes (inner and outer), and avoid
exposing the inner call configuration to user to avoid complexity.
For bridges that currently only allow sync query modes, we should
allow them to be configured with async. That means basically all
bridge types except Kafka Producer.
Fixes https://emqx.atlassian.net/browse/EMQX-9392
The returned information does not allow to diagnose the issue (i.e.: a
connection issue due to the wrong host and port, the wrong password
failing authn). However, such information is printed to the logs.
This changes the returned error to the API so that the user is hinted
at looking at the logs for further investigation of the error.
Fixes https://emqx.atlassian.net/browse/EMQX-9129
Currently, if an user configures a bridge with query mode sync, then
all calls to the underlying driver/connector ("inner calls") will
always be synchronous, regardless of its support for async calls.
Since buffer workers always support async queries ("outer calls"), we
should decouple those two call modes (inner and outer), and avoid
exposing the inner call configuration to user to avoid complexity.
There are two situations when we want to force synchronous calls to
the underlying connector even if it supports async:
1) When using `simple_sync_query`, since we are bypassing the buffer
workers;
2) When retrying the inflight window, to avoid overwhelming the
driver.
Those tests in the `flaky` test are really flaky and require lots of
CI retries.
Apparently, the flakiness comes from race conditions from restarting
bridges with the same name too fast between test cases. Previously,
all test cases were sharing the same bridge name (the module name).
Also removes the previously added alarm for request timeout.
There are situations where having a short request timeout and a long
health check interval make sense, so we don't want to alarm the user
for those situations. Instead, we automatically attempt to set a
reasonable `resume_interval` value.
This commit makes sure the inflight window setting is present for the
clickhouse bridge. It also changes emqx_resource_schema that previously
removed the inflight window setting from resources with query mode
`always_sync`. We don't need to do that because all bridges that uses
the buffer worker queue will get async call handling even if the bridge
don't support the async callback.
Co-authored-by: Zaiming (Stone) Shi <zmstone@gmail.com>
Fixes https://emqx.atlassian.net/browse/EMQX-9099
The default value for `request_timeout` is 15 seconds, and the default
resume interval is also 15 seconds (the health check timeout, if
`resume_interval` is not explicitly given). This means that, in
practice, if a buffer worker ever gets into the blocked state, then
almost all requests will timeout.
Proposed improvement:
- `request_timeout` should by default be twice as much as
health_check_interval.
- Emit a alarm if `request_timeout` is not greater than
`health_check_interval`.
