| 89 | } |
| 90 | |
| 91 | void Master::GC() { |
| 92 | Env* env = Env::Default(); |
| 93 | while (true) { |
| 94 | mutex_lock l(mu_); |
| 95 | const int kTimeoutMilliseconds = 10 * 1000; // 10 seconds. |
| 96 | WaitForMilliseconds(&l, &shutdown_cv_, kTimeoutMilliseconds); |
| 97 | if (shutdown_) { |
| 98 | break; |
| 99 | } |
| 100 | std::vector<string> handles; |
| 101 | const int64 num_micros = static_cast<int64>(session_gc_seconds_ * 1000000); |
| 102 | for (const auto& entry : sessions_) { |
| 103 | int64 lat = entry.second->last_access_time_usec(); |
| 104 | if (static_cast<int64>(env->NowMicros()) - lat > num_micros) { |
| 105 | handles.push_back(entry.first); |
| 106 | auto* sess = entry.second; |
| 107 | SchedClosure([this, sess]() { |
| 108 | LOG(WARNING) << "GC session " << sess->handle() << " after " |
| 109 | << session_gc_seconds_ << " seconds. " |
| 110 | << "Note that if you are starting multiple replicas " |
| 111 | << "on a staggered delay, session_gc_seconds may need " |
| 112 | << "to be raised."; |
| 113 | sess->GarbageCollect(); |
| 114 | }); |
| 115 | } |
| 116 | } |
| 117 | for (const auto& handle : handles) sessions_.erase(handle); |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | MasterSession* Master::FindMasterSession(const string& handle) { |
| 122 | MasterSession* session = nullptr; |