org.apache.drill.yarn.core.DoYUtil.java Source code

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Here is the source code for org.apache.drill.yarn.core.DoYUtil.java

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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.drill.yarn.core;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.CodeSource;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.yarn.api.records.Container;

public class DoYUtil {
    static final private Log LOG = LogFactory.getLog(DoYUtil.class);

    private DoYUtil() {
    }

    public static String join(String separator, List<String> list) {
        StringBuilder buf = new StringBuilder();
        String sep = "";
        for (String item : list) {
            buf.append(sep);
            buf.append(item);
            sep = separator;
        }
        return buf.toString();
    }

    public static void addNonEmpty(List<String> list, String value) {
        if (!isBlank(value)) {
            list.add(value.trim());
        }
    }

    public static boolean isBlank(String str) {
        return str == null || str.trim().isEmpty();
    }

    public static String toIsoTime(long timestamp) {

        // Uses old-style dates rather than java.time because
        // the code still must compile for JDK 7.

        DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        fmt.setTimeZone(TimeZone.getDefault());
        return fmt.format(new Date(timestamp));
    }

    public static String labelContainer(Container container) {
        StringBuilder buf = new StringBuilder().append("[id: ").append(container.getId()).append(", host: ")
                .append(container.getNodeId().getHost()).append(", priority: ").append(container.getPriority())
                .append("]");
        return buf.toString();
    }

    /**
     * Utility method to display YARN container information in a useful way for
     * log messages.
     *
     * @param container
     * @return
     */

    public static String describeContainer(Container container) {
        StringBuilder buf = new StringBuilder().append("[id: ").append(container.getId()).append(", host: ")
                .append(container.getNodeId().getHost()).append(", priority: ").append(container.getPriority())
                .append(", memory: ").append(container.getResource().getMemory()).append(" MB, vcores: ")
                .append(container.getResource().getVirtualCores()).append("]");
        return buf.toString();
    }

    /**
     * The tracking URL given to YARN is a redirect URL. When giving the URL to
     * the user, "unwrap" that redirect URL to get the actual site URL.
     *
     * @param trackingUrl
     * @return
     */

    public static String unwrapAmUrl(String trackingUrl) {
        return trackingUrl.replace("/redirect", "/");
    }

    public static Object dynamicCall(Object target, String fnName, Object args[], Class<?> types[]) {

        // First, look for the method using the names and types provided.

        final String methodLabel = target.getClass().getName() + "." + fnName;
        Method m;
        try {
            m = target.getClass().getMethod(fnName, types);
        } catch (NoSuchMethodException e) {

            // Ignore, but log: the method does not exist in this distribution.

            StringBuilder buf = new StringBuilder();
            if (types != null) {
                String sep = "";
                for (Class<?> type : types) {
                    buf.append(sep);
                    buf.append(type.getName());
                    sep = ",";
                }
            }
            LOG.trace("Not supported in this YARN distribution: " + methodLabel + "(" + buf.toString() + ")");
            CodeSource src = target.getClass().getProtectionDomain().getCodeSource();
            if (src != null) {
                java.net.URL jar = src.getLocation();
                LOG.trace("Class found in URL: " + jar.toString());
            }
            return null;
        } catch (SecurityException e) {
            LOG.error("Security prevents dynamic method calls", e);
            return null;
        }

        // Next, call the method with the arguments provided.

        Object ret = null;
        try {
            ret = m.invoke(target, args);
        } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
            LOG.error("Failed to dynamically call " + methodLabel, e);
            return null;
        }
        StringBuilder buf = new StringBuilder();
        if (args != null) {
            String sep = "";
            for (Object arg : args) {
                buf.append(sep);
                buf.append(arg == null ? "null" : arg.toString());
                sep = ",";
            }
        }
        LOG.trace("Successfully called " + methodLabel + "( " + buf.toString() + ")");

        // Return any return value. Will be null if the method is returns void.

        return ret;
    }

    public static void callSetDiskIfExists(Object target, double arg) {
        dynamicCall(target, "setDisks", new Object[] { arg }, new Class<?>[] { Double.TYPE });
    }

    public static double callGetDiskIfExists(Object target) {
        Object ret = dynamicCall(target, "getDisks", null, null);
        return (ret == null) ? 0.0 : (Double) ret;
    }
}