| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| |
| #ifndef IMPALA_SCHEDULING_REQUEST_POOL_SERVICE_H |
| #define IMPALA_SCHEDULING_REQUEST_POOL_SERVICE_H |
| |
| #include <jni.h> |
| |
| #include "gen-cpp/ImpalaInternalService.h" |
| #include "common/status.h" |
| #include "util/metrics-fwd.h" |
| |
| namespace impala { |
| |
| /// Service to resolve incoming requests to resource pools and to provide the pool |
| /// configurations. A single instance of RequestPoolService is created and it lives the |
| /// lifetime of the process. |
| /// |
| /// The resource pools are specified via fair-scheduler.xml and llama-site.xml files if |
| /// they are available, otherwise all requests are mapped to a single 'default-pool' |
| /// which is configurable via gflags. The xml files are managed by the Java class |
| /// RequestPoolService, called via JNI. |
| class RequestPoolService { |
| public: |
| /// Initializes the JNI method stubs if configuration files are specified. If any |
| /// method can't be found, or if there is any further error, the constructor will |
| /// terminate the process. |
| RequestPoolService(MetricGroup* metrics); |
| |
| /// Resolves the request to a resource pool as determined by the policy. Returns an |
| /// error if the request cannot be resolved to a pool or if the user does not have |
| /// access to submit requests in the resolved pool. If default_pool_only_ is true, |
| /// then this will always return the default pool. |
| Status ResolveRequestPool(const TQueryCtx& ctx, std::string* resolved_pool); |
| |
| /// Gets the pool configuration values for the specified pool. If default_pool_only_ is |
| /// true, then the returned values are always the default pool values, i.e. pool_name |
| /// is ignored. |
| Status GetPoolConfig(const std::string& pool_name, TPoolConfig* pool_config); |
| |
| private: |
| /// Metric measuring the time ResolveRequestPool() takes, in milliseconds. |
| StatsMetric<double>* resolve_pool_ms_metric_; |
| |
| /// True if the pool configuration files are not provided. ResolveRequestPool() will |
| /// always return the default-pool and GetPoolConfig() will always return the limits |
| /// specified by the default pool gflags, which are unlimited unless specified via |
| /// the 'default_pool_max_XXX' flags (see the flag definitions in |
| /// request-pool-service.cc). |
| bool default_pool_only_; |
| |
| /// Mem limit (in bytes) of the default pool. Only used if default_pool_only_ is true. |
| /// Set in the constructor by parsing the 'default_pool_mem_limit' gflag using |
| /// ParseUtil::ParseMemSpec(). |
| int64_t default_pool_mem_limit_; |
| |
| /// The following members are not initialized if default_pool_only_ is true. |
| /// Descriptor of Java RequestPoolService class itself, used to create a new instance. |
| jclass request_pool_service_class_; |
| /// Instance of org.apache.impala.util.RequestPoolService |
| jobject request_pool_service_; |
| jmethodID resolve_request_pool_id_; // RequestPoolService.resolveRequestPool() |
| jmethodID get_pool_config_id_; // RequestPoolService.getPoolConfig() |
| jmethodID ctor_; |
| }; |
| |
| } |
| |
| #endif |