Example usage for org.apache.hadoop.fs FileSystem SHUTDOWN_HOOK_PRIORITY

Introduction

In this page you can find the example usage for org.apache.hadoop.fs FileSystem SHUTDOWN_HOOK_PRIORITY.

Prototype

int SHUTDOWN_HOOK_PRIORITY

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Document

Priority of the FileSystem shutdown hook: .

Usage

From source file:co.cask.cdap.logging.framework.distributed.LogSaverTwillRunnable.java

License:Apache License

@Override
protected Injector doInit(TwillContext context) {
    name = context.getSpecification().getName();
    injector = createGuiceInjector(getCConfiguration(), getConfiguration(), context);

    // Register shutdown hook to stop Log Saver before Hadoop Filesystem shuts down
    ShutdownHookManager.get().addShutdownHook(new Runnable() {
        @Override//from   w  ww  . j a  v a2 s.  c o  m
        public void run() {
            LOG.info("Shutdown hook triggered.");
            stop();
        }
    }, FileSystem.SHUTDOWN_HOOK_PRIORITY + 1);

    return injector;
}

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From source file:co.cask.cdap.logging.run.LogSaverTwillRunnable.java

License:Apache License

@Override
public void run() {
    LOG.info("Starting runnable " + name);

    // Register shutdown hook to stop Log Saver before Hadoop Filesystem shuts down
    ShutdownHookManager.get().addShutdownHook(new Runnable() {
        @Override/*from w w w .j av  a2  s. c om*/
        public void run() {
            LOG.info("Shutdown hook triggered.");
            stop();
        }
    }, FileSystem.SHUTDOWN_HOOK_PRIORITY + 1);

    Futures.getUnchecked(Services.chainStart(zkClientService, kafkaClientService, metricsCollectionService,
            logSaverService, logSaverStatusService));
    LOG.info("Runnable started " + name);

    try {
        completion.get();

        LOG.info("Runnable stopped " + name);
    } catch (InterruptedException e) {
        LOG.error("Waiting on completion interrupted", e);
        Thread.currentThread().interrupt();
    } catch (ExecutionException e) {
        // Propagate the execution exception will causes TwillRunnable terminate with error,
        // and AM would detect and restarts it.
        LOG.error("Completed with exception. Exception get propagated", e);
        throw Throwables.propagate(e);
    }
}

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From source file:com.cloudera.oryx.lambda.HadoopUtils.java

License:Open Source License

/**
 * Adds a shutdown hook that tries to call {@link Closeable#close()} on the given argument
 * at JVM shutdown. This integrates with Hadoop's {@link ShutdownHookManager} in order to
 * better interact with Spark's usage of the same.
 *
 * @param closeable thing to close//from w ww  . j av  a2s. c o m
 */
public static void closeAtShutdown(Closeable closeable) {
    if (SHUTDOWN_HOOK.addCloseable(closeable)) {
        try {
            // Spark uses SHUTDOWN_HOOK_PRIORITY + 30; this tries to execute earlier
            ShutdownHookManager.get().addShutdownHook(SHUTDOWN_HOOK, FileSystem.SHUTDOWN_HOOK_PRIORITY + 40);
        } catch (IllegalStateException ise) {
            log.warn("Can't close {} at shutdown since shutdown is in progress", closeable);
        }
    }
}

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