This is a prerequisite for converting the client_channel filter to
promises. This refactors two objects:
- `ClientChannel::CallData`, which is primarily responsible for applying
the service config to the call
- `ClientChannel::LoadBalancedCall`, which is responsible for doing the
LB pick for the call attempt
Each of those classes has been split into two pieces:
- a base class with the functionality to be shared between the legacy
filter stack implementation and the new promise-based implementation
- a subclass providing the legacy filter stack implementation
A subsequent PR will add another subclass that provides the
promise-based implementation.
Original attempt was #31973, reverted in #32324 due to test flakiness.
There were two problems causing test flakiness here.
The first problem was that, upon resolver error, we were dispatching an
async callback to re-process each of the queued picks *before* we
updated the channel's connectivity state, which meant that the queued
picks might be re-processed in another thread before the new
connectivity state was set, so tests that expected the state to be
TRANSIENT_FAILURE once RPCs failed might not see the expected state.
The second problem affected the xDS ring hash tests, and it's a bit more
involved to explain.
We have an e2e test that simulates an aggregate cluster failover from a
primary cluster using ring_hash at startup. The primary cluster has two
addresses, both of which are unreachable when the client starts up, so
the client should immediately fail over to the secondary cluster, which
does have reachable endpoints. The test requires that no RPCs are failed
while this failover occurs. The original PR made this test flaky.
The problem here was caused by a combination of two factors:
1. Prior to the original PR, when the picker was updated (which happens
inside the WorkSerializer), we re-processed previously queued picks
synchronously, so it was not possible for another subchannel
connectivity state update (which also happens in the WorkSerializer) to
be processed between the time that we updated the picker and the time
that we re-processed the previously queued picks. The original PR
changed this such that the queued picks are re-processed asynchronously
(outside of the WorkSerializer), so it is now possible for a subchannel
connectivity state update to be processed between when the picker is
updated and when we re-process the previously queued picks.
2. Unlike most LB policies, where the picker does not see updated
subchannel connectivity states until a new picker is created, the
ring_hash picker gets the subchannel connectivity states from the LB
policy via a lock, so it can wind up seeing the new states before it
gets updated. This means that when a subchannel connectivity state
update is processed by the ring_hash policy in the WorkSerializer, it
will immediately be seen by the existing picker, even without a picker
update.
With those two points in mind, the sequence of events in the failing
test were as follows:
1. The pick is attempted in the ring_hash picker for the primary
cluster. This causes the first subchannel to attempt to connect.
2. The subchannel transitions from IDLE to CONNECTING. A new picker is
returned due to the subchannel connectivity state change, and the
channel retries the queued pick. The retried pick is done
asynchronously, but in this case it does not matter: the call will be
re-queued.
3. The connection attempt fails, and the subchannel reports
TRANSIENT_FAILURE. A new picker is again returned, and the channel
retries the queued pick. The retried pick is done asynchronously, but in
this case it does not matter: this causes the picker to trigger a
connection attempt for the second subchannel.
4. The second subchannel transitions from IDLE to CONNECTING. A new
picker is again returned, and the channel retries the queued pick. The
retried pick is done asynchronously, and in this case it *does* matter.
5. The second subchannel now transitions to TRANSIENT_FAILURE. The
ring_hash policy will now report TRANSIENT_FAILURE, but before it can
finish that...
6. ...In another thread, the channel now tries to re-process the queued
pick using the CONNECTING picker from step 4. However, because the
ring_hash policy has already seen the TRANSIENT_FAILURE report from the
second subchannel, that picker will now fail the pick instead of queuing
it.
After discussion with @ejona86 and @dfawley (since this bug actually
exists in Java and Go as well), we agreed that the right solution is to
change the ring_hash picker to contain its own copy of the subchannel
connectivity state information, rather than sharing that information
with the LB policy using synchronization.
Currently, the peer name is returned with the completion of the
send_initial_metadata op, which does not make sense, because with
retries, we don't actually know the peer name until we complete the
recv_initial_metadata op. This PR changes our code to return the peer
string as an attribute of the recv_initial_metadata op, so that it is
not available to the application until that point. This change may be
user-visible, but since our API docs don't seem to guarantee exactly
when this data will be available, it's not technically a breaking
change.
Note that in the promise-based stack, we were already assuming that the
peer string would be returned as part of the recv_initial_metadata
batch, so this PR helps reduce risk for the promise conversion by making
this semantic change now, thus decoupling it from the promise
conversion.
I have also changed the representation of the string in the metadata
batch to be a `grpc_core::Slice` instead of a `std::string`, so that we
can just take a ref to the string held in the transport instead of
having to copy the whole string for every call.
While creating an internal CL that depends directly on
tsi_alts_credentials, I was getting linker errors saying ` error:
backward reference detected: grpc_channel_credentials_release`, because
`alts_tsi_handshaker.cc` uses the `grpc_channel_credentials_release`
API, which is defined in the `grpc_security_base` target.
There were some rollback conflicts, so this isn't a pure rollback.
This reverts commit ba0e55f539.
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Cleanup and remove ios cpp test cronet
To test manually:
./tools/bazel test //src/objective-c/tests:CppCronetTests
@sampajano
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Rollforward #32346 with some fixes in
1e88193edd
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To be merged after #31448#32110#32094
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---------
Co-authored-by: ctiller <ctiller@users.noreply.github.com>
* WIP
* use the same lock for queue and picker -- still need to figure out how to drain queue safely
* working!
* always unref pickers in WorkSerializer
* simplify tracking of queued calls
* fix sanity
* simplify resolver queueing code
* fix tsan failure
* simplify queued LB pick reprocessing
* minor cleanups
* remove unnecessary wrap-around checks
* clang-format
* generate_projects
* fix pollset bug
* use absl::flat_hash_set<> instead of std::set<>
* fix use-after-free in retry code
* add missing BUILD dep
* Revert "Revert "Revert "Revert "server: introduce ServerMetricRecorder API and move per-call reporting from a C++ interceptor to a C-core filter (#32106)" (#32272)" (#32279)" (#32293)"
This reverts commit 1f960697c5.
* Do not create CallMetricRecorder if call is null.
* Revert "Revert "server: introduce ServerMetricRecorder API and move per-call reporting from a C++ interceptor to a C-core filter (#32106)" (#32272)"
This reverts commit deb1e25543.
* Fix by caching call metric recording stuff in async request
PR #32106 caused msan errors in some tests while de-referencing the
server object where async calls are active after the server is
destroyed. Instead cache the ServerMetricRecorder pointer.
* copyright headers fixed
* clang fixes.
* see if experiments can lose weight
* test
* test
* test
* test
* contra test
* contra test
* add explainer
* Automated change: Fix sanity tests
* fixes
* fix
* strict-bs
* comments
* fixes
* iwyu
---------
Co-authored-by: ctiller <ctiller@users.noreply.github.com>
* WRR: port StaticStrideScheduler to OSS
* WIP
* Automated change: Fix sanity tests
* fix build
* remove unused aliases
* fix another type mismatch
* remove unnecessary include
* move benchmarks to their own file, and don't run it on windows
* Automated change: Fix sanity tests
* add OOB reporting
* generate_projects
* clang-format
* add config parser test
* clang-tidy and minimize lock contention
* add config defaults
* add oob_reporting_period config field and add basic test
* Automated change: Fix sanity tests
* fix test
* change test to use basic RR
* WIP: started exposing peer address to LB policy API
* first WRR test passing!
* small cleanup
* port RR fix to WRR
* test helper refactoring
* more test helper refactoring
* WIP: trying to fix test to have the right weights
* more WIP -- need to make pickers DualRefCounted
* fix timer ref handling and get tests working
* clang-format
* iwyu and generate_projects
* fix build
* add test for OOB reporting
* keep only READY subchannels in the picker
* add file missed in a previous commit
* fix sanity
* iwyu
* add weight expiration period
* add tests for weight update period and OOB reporting period
* Automated change: Fix sanity tests
* lower bound for timer interval
* consistently apply grpc_test_slowdown_factor()
* cache time in test
* add blackout_period tests
* avoid some unnecessary copies
* clang-format
* add field to config test
* simplify orca watcher tracking
* attempt to fix build
* iwyu
* generate_projects
* update xds proto dependency
* add xDS LB policy entry to registry
* add "_experimental" suffix to policy name
* update LB policy name and remove debug log
* add env var protection
* generate_projects
* gen_upb_api
* WRR: update tests to cover qps plumbing
* WIP
* Automated change: Fix sanity tests
* more WIP
* basic WRR e2e test working
* add OOB test
* add xDS WRR e2e test
* clang-format
* fix sanity
* ignore duplicate addresses
* Automated change: Fix sanity tests
* add new tracer to doc/environment_variables.md
* retain scheduler state across pickers
* Automated change: Fix sanity tests
* use separate mutexes for scheduler and timer
* sort addresses to avoid index churn
* remove fetch_sub for wrap around in RR case
Co-authored-by: markdroth <markdroth@users.noreply.github.com>
* WRR: port StaticStrideScheduler to OSS
* WIP
* Automated change: Fix sanity tests
* fix build
* remove unused aliases
* fix another type mismatch
* remove unnecessary include
* move benchmarks to their own file, and don't run it on windows
* Automated change: Fix sanity tests
* add OOB reporting
* generate_projects
* clang-format
* add config parser test
* clang-tidy and minimize lock contention
* add config defaults
* add oob_reporting_period config field and add basic test
* Automated change: Fix sanity tests
* fix test
* change test to use basic RR
* WIP: started exposing peer address to LB policy API
* first WRR test passing!
* small cleanup
* port RR fix to WRR
* test helper refactoring
* more test helper refactoring
* WIP: trying to fix test to have the right weights
* more WIP -- need to make pickers DualRefCounted
* fix timer ref handling and get tests working
* clang-format
* iwyu and generate_projects
* fix build
* add test for OOB reporting
* keep only READY subchannels in the picker
* add file missed in a previous commit
* fix sanity
* iwyu
* add weight expiration period
* add tests for weight update period and OOB reporting period
* Automated change: Fix sanity tests
* lower bound for timer interval
* consistently apply grpc_test_slowdown_factor()
* cache time in test
* add blackout_period tests
* avoid some unnecessary copies
* clang-format
* add field to config test
* simplify orca watcher tracking
* attempt to fix build
* iwyu
* generate_projects
* add "_experimental" suffix to policy name
* WRR: update tests to cover qps plumbing
* WIP
* more WIP
* basic WRR e2e test working
* add OOB test
* fix sanity
* ignore duplicate addresses
* Automated change: Fix sanity tests
* add new tracer to doc/environment_variables.md
* retain scheduler state across pickers
* Automated change: Fix sanity tests
* use separate mutexes for scheduler and timer
* sort addresses to avoid index churn
* remove fetch_sub for wrap around in RR case
Co-authored-by: markdroth <markdroth@users.noreply.github.com>
* Revert "Revert "Add support for systemd socket activation (#30485)" (#31617)"
This reverts commit 867dc6cae2.
* Add checks to unix tests
* Ran generate_projects.sh and fixed styling in test
* Fix variable in unit test
* Use reinterpret_cast in test
* Rebase and fix sanity failures
Mark D. Roth
Matthew Stevenson
Craig Tiller
Hannah Shi
Yash Tibrewal
Yousuk Seung
Xuan Wang
AJ Heller
Vignesh Babu
Alisha Nanda
Jan Tattermusch
Laramie Leavitt
Andres Beltran
Eugene Ostroukhov