Example usage for org.apache.hadoop.util ServicePlugin stop

Introduction

In this page you can find the example usage for org.apache.hadoop.util ServicePlugin stop.

Prototype

void stop();

Source Link

Document

This method is invoked when the service instance is about to be shut down.

Usage

From source file:common.DataNode.java

License:Apache License

/**
 * Shut down this instance of the datanode.
 * Returns only after shutdown is complete.
 * This method can only be called by the offerService thread.
 * Otherwise, deadlock might occur./*  ww w  . ja  v a 2s  .co  m*/
 */
public void shutdown() {
    if (plugins != null) {
        for (ServicePlugin p : plugins) {
            try {
                p.stop();
                LOG.info("Stopped plug-in " + p);
            } catch (Throwable t) {
                LOG.warn("ServicePlugin " + p + " could not be stopped", t);
            }
        }
    }

    if (infoServer != null) {
        try {
            infoServer.stop();
        } catch (Exception e) {
            LOG.warn("Exception shutting down DataNode", e);
        }
    }
    if (ipcServer != null) {
        ipcServer.stop();
    }
    this.shouldRun = false;
    if (dataXceiverServer != null) {
        ((DataXceiverServer) this.dataXceiverServer.getRunnable()).kill();
        this.dataXceiverServer.interrupt();

        // wait for all data receiver threads to exit
        if (this.threadGroup != null) {
            int sleepMs = 2;
            while (true) {
                this.threadGroup.interrupt();
                LOG.info(
                        "Waiting for threadgroup to exit, active threads is " + this.threadGroup.activeCount());
                if (this.threadGroup.activeCount() == 0) {
                    break;
                }
                try {
                    Thread.sleep(sleepMs);
                } catch (InterruptedException e) {
                }
                sleepMs = sleepMs * 3 / 2; // exponential backoff
                if (sleepMs > 1000) {
                    sleepMs = 1000;
                }
            }
        }
        // wait for dataXceiveServer to terminate
        try {
            this.dataXceiverServer.join();
        } catch (InterruptedException ie) {
        }
    }

    RPC.stopProxy(namenode); // stop the RPC threads

    if (upgradeManager != null)
        upgradeManager.shutdownUpgrade();
    if (blockScannerThread != null) {
        blockScannerThread.interrupt();
        try {
            blockScannerThread.join(3600000L); // wait for at most 1 hour
        } catch (InterruptedException ie) {
        }
    }
    if (storage != null) {
        try {
            this.storage.unlockAll();
        } catch (IOException ie) {
            LOG.warn("Exception when unlocking storage: " + ie, ie);
        }
    }
    if (dataNodeThread != null) {
        dataNodeThread.interrupt();
        try {
            dataNodeThread.join();
        } catch (InterruptedException ie) {
        }
    }
    if (data != null) {
        data.shutdown();
    }
    if (myMetrics != null) {
        myMetrics.shutdown();
    }
}

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From source file:common.NameNode.java

License:Apache License

/**
 * Stop all NameNode threads and wait for all to finish.
 *//*  ww w  .  j  a v a 2  s  .com*/
public void stop() {
    synchronized (this) {
        if (stopRequested)
            return;
        stopRequested = true;
    }
    if (plugins != null) {
        for (ServicePlugin p : plugins) {
            try {
                p.stop();
            } catch (Throwable t) {
                LOG.warn("ServicePlugin " + p + " could not be stopped", t);
            }
        }
    }
    try {
        if (httpServer != null)
            httpServer.stop();
    } catch (Exception e) {
        LOG.error(StringUtils.stringifyException(e));
    }
    if (namesystem != null)
        namesystem.close();
    if (emptier != null)
        emptier.interrupt();
    if (server != null)
        server.stop();
    if (myMetrics != null) {
        myMetrics.shutdown();
    }
    if (namesystem != null) {
        namesystem.shutdown();
    }
}

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