main_okk

risingwave_rt

Function main_okk 

Source 
pub fn main_okk<F, Fut>(f: F) -> !
where
    F: FnOnce(CancellationToken) -> Fut,
    Fut: Future<Output = ()> + Send + 'static,
Expand description

Start RisingWave components with configs from environment variable.

§Shutdown on Ctrl-C

The given closure f will take a [CancellationToken] as an argument. When a SIGINT signal is received (typically by pressing Ctrl-C), [CancellationToken::cancel] will be called to notify all subscribers to shutdown. You can use .cancelled() to get notified on this.

Users may also send a second SIGINT signal to force shutdown. In this case, this function will exit the process with a non-zero exit code.

When f returns, this function will assume that the component has finished its work and it’s safe to exit. Therefore, this function will exit the process with exit code 0 without waiting for background tasks to finish. In other words, it’s the responsibility of f to ensure that all essential background tasks are finished before returning.

§Environment variables

Currently, the following environment variables will be read and used to configure the runtime.

  • RW_WORKER_THREADS (alias of TOKIO_WORKER_THREADS): number of tokio worker threads. If not set, it will be decided by tokio. Note that this can still be overridden by per-module runtime worker thread settings in the config file.
  • RW_DEADLOCK_DETECTION: whether to enable deadlock detection. If not set, will enable in debug mode, and disable in release mode.
  • RW_PROFILE_PATH: the path to generate flamegraph. If set, then profiling is automatically enabled.