/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.service;
import java.io.File;
import java.io.IOException;
import java.net.InetAddress;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.UUID;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.apache.log4j.PropertyConfigurator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.ConfigurationException;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.CompactionManager;
import org.apache.cassandra.db.SystemTable;
import org.apache.cassandra.db.Table;
import org.apache.cassandra.db.commitlog.CommitLog;
import org.apache.cassandra.db.migration.Migration;
import org.apache.cassandra.utils.CLibrary;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.Mx4jTool;
import org.mortbay.thread.ThreadPool;
/**
* The <code>CassandraDaemon</code> is an abstraction for a Cassandra daemon
* service, which defines not only a way to activate and deactivate it, but also
* hooks into its lifecycle methods (see {@link #setup()}, {@link #start()},
* {@link #stop()} and {@link #setup()}).
*
*/
public abstract class AbstractCassandraDaemon implements CassandraDaemon
{
//Initialize logging in such a way that it checks for config changes every 10 seconds.
static
{
String config = System.getProperty("log4j.configuration", "log4j-server.properties");
URL configLocation = null;
try
{
// try loading from a physical location first.
configLocation = new URL(config);
}
catch (MalformedURLException ex)
{
// load from the classpath.
configLocation = AbstractCassandraDaemon.class.getClassLoader().getResource(config);
if (configLocation == null)
throw new RuntimeException("Couldn't figure out log4j configuration.");
}
PropertyConfigurator.configureAndWatch(configLocation.getFile(), 10000);
org.apache.log4j.Logger.getLogger(AbstractCassandraDaemon.class).info("Logging initialized");
}
private static Logger logger = LoggerFactory.getLogger(AbstractCassandraDaemon.class);
protected InetAddress listenAddr;
protected int listenPort;
protected volatile boolean isRunning = false;
/**
* This is a hook for concrete daemons to initialize themselves suitably.
*
* Subclasses should override this to finish the job (listening on ports, etc.)
*
* @throws IOException
*/
protected void setup() throws IOException
{
logger.info("Heap size: {}/{}", Runtime.getRuntime().totalMemory(), Runtime.getRuntime().maxMemory());
CLibrary.tryMlockall();
listenPort = DatabaseDescriptor.getRpcPort();
listenAddr = DatabaseDescriptor.getRpcAddress();
/*
* If ThriftAddress was left completely unconfigured, then assume
* the same default as ListenAddress
*/
if (listenAddr == null)
listenAddr = FBUtilities.getLocalAddress();
Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler()
{
public void uncaughtException(Thread t, Throwable e)
{
logger.error("Fatal exception in thread " + t, e);
if (e instanceof OutOfMemoryError)
{
System.exit(100);
}
}
});
// check the system table to keep user from shooting self in foot by changing partitioner, cluster name, etc.
// we do a one-off scrub of the system table first; we can't load the list of the rest of the tables,
// until system table is opened.
for (CFMetaData cfm : DatabaseDescriptor.getTableMetaData(Table.SYSTEM_TABLE).values())
ColumnFamilyStore.scrubDataDirectories(Table.SYSTEM_TABLE, cfm.cfName);
try
{
SystemTable.checkHealth();
}
catch (ConfigurationException e)
{
logger.error("Fatal exception during initialization", e);
System.exit(100);
}
// load keyspace descriptions.
try
{
DatabaseDescriptor.loadSchemas();
}
catch (IOException e)
{
logger.error("Fatal exception during initialization", e);
System.exit(100);
}
// clean up debris in the rest of the tables
for (String table : DatabaseDescriptor.getTables())
{
for (CFMetaData cfm : DatabaseDescriptor.getTableMetaData(table).values())
{
ColumnFamilyStore.scrubDataDirectories(table, cfm.cfName);
}
}
// initialize keyspaces
for (String table : DatabaseDescriptor.getTables())
{
if (logger.isDebugEnabled())
logger.debug("opening keyspace " + table);
Table.open(table);
}
try
{
GCInspector.instance.start();
}
catch (Throwable t)
{
logger.warn("Unable to start GCInspector (currently only supported on the Sun JVM)");
}
// replay the log if necessary and check for compaction candidates
//if(DatabaseDescriptor.isBigtable())
//{
CommitLog.recover();
CompactionManager.instance.checkAllColumnFamilies();
//}
// check to see if CL.recovery modified the lastMigrationId. if it did, we need to re apply migrations. this isn't
// the same as merely reloading the schema (which wouldn't perform file deletion after a DROP). The solution
// is to read those migrations from disk and apply them.
UUID currentMigration = DatabaseDescriptor.getDefsVersion();
UUID lastMigration = Migration.getLastMigrationId();
if ((lastMigration != null) && (lastMigration.timestamp() > currentMigration.timestamp()))
{
MigrationManager.applyMigrations(currentMigration, lastMigration);
}
SystemTable.purgeIncompatibleHints();
// start server internals
StorageService.instance.registerDaemon(this);
try
{
StorageService.instance.initServer();
}
catch (ConfigurationException e)
{
logger.error("Fatal configuration error", e);
System.err.println(e.getMessage() + "\nFatal configuration error; unable to start server. See log for stacktrace.");
System.exit(1);
}
Mx4jTool.maybeLoad();
}
/**
* Initialize the Cassandra Daemon based on the given <a
* href="http://commons.apache.org/daemon/jsvc.html">Commons
* Daemon</a>-specific arguments. To clarify, this is a hook for JSVC.
*
* @param arguments
* the arguments passed in from JSVC
* @throws IOException
*/
public void init(String[] arguments) throws IOException
{
setup();
}
/**
* Start the Cassandra Daemon, assuming that it has already been
* initialized via {@link #init(String[])}
*
* Hook for JSVC
*
* @throws IOException
*/
public void start()
{
if (Boolean.parseBoolean(System.getProperty("cassandra.start_rpc", "true")))
{
startRPCServer();
}
else
{
logger.info("Not starting RPC server as requested. Use JMX (StorageService->startRPCServer()) to start it");
}
}
/**
* Stop the daemon, ideally in an idempotent manner.
*
* Hook for JSVC
*/
public void stop()
{
// this doesn't entirely shut down Cassandra, just the RPC server.
// jsvc takes care of taking the rest down
logger.info("Cassandra shutting down...");
stopRPCServer();
}
/**
* Start the underlying RPC server in idempotent manner.
*/
public void startRPCServer()
{
if (!isRunning)
{
startServer();
isRunning = true;
}
}
/**
* Stop the underlying RPC server in idempotent manner.
*/
public void stopRPCServer()
{
if (isRunning)
{
stopServer();
isRunning = false;
}
}
/**
* Returns whether the underlying RPC server is running or not.
*/
public boolean isRPCServerRunning()
{
return isRunning;
}
/**
* Start the underlying RPC server.
* This method shoud be able to restart a server stopped through stopServer().
* Should throw a RuntimeException if the server cannot be started
*/
protected abstract void startServer();
/**
* Stop the underlying RPC server.
* This method should be able to stop server started through startServer().
* Should throw a RuntimeException if the server cannot be stopped
*/
protected abstract void stopServer();
/**
* Clean up all resources obtained during the lifetime of the daemon. This
* is a hook for JSVC.
*/
public void destroy()
{}
/**
* A convenience method to initialize and start the daemon in one shot.
*/
public void activate()
{
String pidFile = System.getProperty("cassandra-pidfile");
try
{
setup();
if (pidFile != null)
{
new File(pidFile).deleteOnExit();
}
if (System.getProperty("cassandra-foreground") == null)
{
System.out.close();
System.err.close();
}
start();
} catch (Throwable e)
{
String msg = "Exception encountered during startup.";
logger.error(msg, e);
// try to warn user on stdout too, if we haven't already detached
System.out.println(msg);
e.printStackTrace();
System.exit(3);
}
}
/**
* A convenience method to stop and destroy the daemon in one shot.
*/
public void deactivate()
{
stop();
destroy();
}
/**
* A subclass of Java's ThreadPoolExecutor which implements Jetty's ThreadPool
* interface (for integration with Avro), and performs ClientState cleanup.
*/
public static class CleaningThreadPool extends ThreadPoolExecutor implements ThreadPool
{
private ThreadLocal<ClientState> state;
public CleaningThreadPool(ThreadLocal<ClientState> state, int minWorkerThread, int maxWorkerThreads)
{
super(minWorkerThread, maxWorkerThreads, 60, TimeUnit.SECONDS, new SynchronousQueue<Runnable>());
this.state = state;
}
@Override
protected void afterExecute(Runnable r, Throwable t)
{
super.afterExecute(r, t);
DebuggableThreadPoolExecutor.logExceptionsAfterExecute(r, t);
state.get().logout();
}
/*********************************************************************/
/** The following are cribbed from org.mortbay.thread.concurrent */
/*********************************************************************/
public boolean dispatch(Runnable job)
{
try
{
execute(job);
return true;
}
catch(RejectedExecutionException e)
{
logger.error("Failed to dispatch thread:", e);
return false;
}
}
public int getIdleThreads()
{
return getPoolSize()-getActiveCount();
}
public int getThreads()
{
return getPoolSize();
}
public boolean isLowOnThreads()
{
return getActiveCount()>=getMaximumPoolSize();
}
public void join() throws InterruptedException
{
this.awaitTermination(Long.MAX_VALUE,TimeUnit.MILLISECONDS);
}
}
}