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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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/*
 * 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.utils;

import java.io.FileNotFoundException;
import java.net.SocketException;

import com.google.common.annotations.VisibleForTesting;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.cassandra.config.Config;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.io.FSError;
import org.apache.cassandra.io.sstable.CorruptSSTableException;
import org.apache.cassandra.service.StorageService;

/**
 * Responsible for deciding whether to kill the JVM if it gets in an "unstable" state (think OOM).
 */
public final class JVMStabilityInspector
{
    private static final Logger logger = LoggerFactory.getLogger(JVMStabilityInspector.class);
    private static Killer killer = new Killer();

    private JVMStabilityInspector() {}

    /**
     * Certain Throwables and Exceptions represent "Die" conditions for the server.
     * @param t
     *      The Throwable to check for server-stop conditions
     */
    public static void inspectThrowable(Throwable t)
    {
        boolean isUnstable = false;
        if (t instanceof OutOfMemoryError)
            isUnstable = true;

        if (DatabaseDescriptor.getDiskFailurePolicy() == Config.DiskFailurePolicy.die)
            if (t instanceof FSError || t instanceof CorruptSSTableException)
            isUnstable = true;

        // Check for file handle exhaustion
        if (t instanceof FileNotFoundException || t instanceof SocketException)
            if (t.getMessage().contains("Too many open files"))
                isUnstable = true;

        if (isUnstable)
            killer.killCurrentJVM(t);
    }

    public static void inspectCommitLogThrowable(Throwable t)
    {
        if (DatabaseDescriptor.getCommitFailurePolicy() == Config.CommitFailurePolicy.die)
            killer.killCurrentJVM(t);
        else
            inspectThrowable(t);
    }

    @VisibleForTesting
    public static Killer replaceKiller(Killer newKiller) {
        Killer oldKiller = JVMStabilityInspector.killer;
        JVMStabilityInspector.killer = newKiller;
        return oldKiller;
    }

    @VisibleForTesting
    public static class Killer
    {
        /**
        * Certain situations represent "Die" conditions for the server, and if so, the reason is logged and the current JVM is killed.
        *
        * @param t
        *      The Throwable to log before killing the current JVM
        */
        protected void killCurrentJVM(Throwable t)
        {
            t.printStackTrace(System.err);
            logger.error("JVM state determined to be unstable.  Exiting forcefully due to:", t);
            StorageService.instance.removeShutdownHook();
            System.exit(100);
        }
    }
}