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feat(throttle): support size-based write throttling (#298)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| // Copyright (c) 2017-present, Xiaomi, Inc. All rights reserved. | ||
| // This source code is licensed under the Apache License Version 2.0, which | ||
| // can be found in the LICENSE file in the root directory of this source tree. | ||
|
|
||
| #include "replica.h" | ||
| #include "mutation.h" | ||
| #include "mutation_log.h" | ||
| #include "replica_stub.h" | ||
|
|
||
| #include <dsn/dist/replication/replication_app_base.h> | ||
| #include <dsn/dist/fmt_logging.h> | ||
|
|
||
| namespace dsn { | ||
| namespace replication { | ||
|
|
||
| bool replica::throttle_request(throttling_controller &controller, | ||
| message_ex *request, | ||
| int32_t request_units) | ||
| { | ||
| if (!controller.enabled()) { | ||
| return false; | ||
| } | ||
|
|
||
| int64_t delay_ms = 0; | ||
| auto type = controller.control(request, request_units, delay_ms); | ||
| if (type != throttling_controller::PASS) { | ||
| if (type == throttling_controller::DELAY) { | ||
| tasking::enqueue(LPC_WRITE_THROTTLING_DELAY, | ||
| &_tracker, | ||
| [ this, req = message_ptr(request) ]() { on_client_write(req, true); }, | ||
| get_gpid().thread_hash(), | ||
| std::chrono::milliseconds(delay_ms)); | ||
| _counter_recent_write_throttling_delay_count->increment(); | ||
| } else { // type == throttling_controller::REJECT | ||
| if (delay_ms > 0) { | ||
| tasking::enqueue(LPC_WRITE_THROTTLING_DELAY, | ||
| &_tracker, | ||
| [ this, req = message_ptr(request) ]() { | ||
| response_client_write(req, ERR_BUSY); | ||
| }, | ||
| get_gpid().thread_hash(), | ||
| std::chrono::milliseconds(delay_ms)); | ||
| } else { | ||
| response_client_write(request, ERR_BUSY); | ||
| } | ||
| _counter_recent_write_throttling_reject_count->increment(); | ||
| } | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| void replica::update_throttle_envs(const std::map<std::string, std::string> &envs) | ||
| { | ||
| update_throttle_env_internal( | ||
| envs, replica_envs::WRITE_QPS_THROTTLING, _write_qps_throttling_controller); | ||
| update_throttle_env_internal( | ||
| envs, replica_envs::WRITE_SIZE_THROTTLING, _write_size_throttling_controller); | ||
| } | ||
|
|
||
| void replica::update_throttle_env_internal(const std::map<std::string, std::string> &envs, | ||
| const std::string &key, | ||
| throttling_controller &cntl) | ||
| { | ||
| bool throttling_changed = false; | ||
| std::string old_throttling; | ||
| std::string parse_error; | ||
| auto find = envs.find(key); | ||
| if (find != envs.end()) { | ||
| if (!cntl.parse_from_env(find->second, | ||
| _app_info.partition_count, | ||
| parse_error, | ||
| throttling_changed, | ||
| old_throttling)) { | ||
| dwarn_replica("parse env failed, key = \"{}\", value = \"{}\", error = \"{}\"", | ||
| key, | ||
| find->second, | ||
| parse_error); | ||
| // reset if parse failed | ||
| cntl.reset(throttling_changed, old_throttling); | ||
| } | ||
| } else { | ||
| // reset if env not found | ||
| cntl.reset(throttling_changed, old_throttling); | ||
| } | ||
| if (throttling_changed) { | ||
| ddebug_replica("switch {} from \"{}\" to \"{}\"", key, old_throttling, cntl.env_value()); | ||
| } | ||
| } | ||
|
|
||
| } // namespace replication | ||
| } // namespace dsn |
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