RemoteStore: Add option to drop old connections from the pool
This is a hack to make hydra-queue-runner free its temproots periodically, thereby ensuring that garbage collection of the corresponding paths is not blocked until the queue runner is restarted. It would be better if temproots could be released earlier than at process exit. I started working on a RAII object returned by functions like addToStore() that releases temproots. However, this would be a pretty massive change so I gave up on it for now.
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308ecf6361
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89dc62c174
3 changed files with 31 additions and 1 deletions
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@ -45,7 +45,13 @@ RemoteStore::RemoteStore(const Params & params)
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, connections(make_ref<Pool<Connection>>(
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std::max(1, (int) maxConnections),
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[this]() { return openConnectionWrapper(); },
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[](const ref<Connection> & r) { return r->to.good() && r->from.good(); }
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[this](const ref<Connection> & r) {
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return
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r->to.good()
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&& r->from.good()
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&& std::chrono::duration_cast<std::chrono::seconds>(
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std::chrono::steady_clock::now() - r->startTime).count() < maxConnectionAge;
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}
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))
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{
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}
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@ -106,6 +112,8 @@ ref<RemoteStore::Connection> UDSRemoteStore::openConnection()
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conn->from.fd = conn->fd.get();
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conn->to.fd = conn->fd.get();
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conn->startTime = std::chrono::steady_clock::now();
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initConnection(*conn);
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return conn;
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@ -619,6 +627,12 @@ void RemoteStore::connect()
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}
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void RemoteStore::flushBadConnections()
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{
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connections->flushBad();
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}
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RemoteStore::Connection::~Connection()
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{
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try {
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@ -25,6 +25,9 @@ public:
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const Setting<int> maxConnections{(Store*) this, 1,
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"max-connections", "maximum number of concurrent connections to the Nix daemon"};
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const Setting<unsigned int> maxConnectionAge{(Store*) this, std::numeric_limits<unsigned int>::max(),
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"max-connection-age", "number of seconds to reuse a connection"};
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RemoteStore(const Params & params);
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/* Implementations of abstract store API methods. */
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@ -95,6 +98,8 @@ public:
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void connect() override;
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void flushBadConnections();
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protected:
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struct Connection
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@ -102,6 +107,7 @@ protected:
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FdSink to;
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FdSource from;
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unsigned int daemonVersion;
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std::chrono::time_point<std::chrono::steady_clock> startTime;
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virtual ~Connection();
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@ -168,6 +168,16 @@ public:
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{
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return state.lock()->max;
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}
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void flushBad()
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{
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auto state_(state.lock());
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std::vector<ref<R>> left;
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for (auto & p : state_->idle)
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if (validator(p))
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left.push_back(p);
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std::swap(state_->idle, left);
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}
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};
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}
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