org.apache.accumulo.monitor.ZooKeeperStatus.java Source code

Introduction

Here is the source code for org.apache.accumulo.monitor.ZooKeeperStatus.java

Source

/*
 * 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.accumulo.monitor;

import static java.nio.charset.StandardCharsets.UTF_8;

import java.util.Collection;
import java.util.Objects;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.concurrent.TimeUnit;

import org.apache.accumulo.core.conf.Property;
import org.apache.accumulo.core.conf.SiteConfiguration;
import org.apache.accumulo.core.rpc.TTimeoutTransport;
import org.apache.thrift.transport.TTransport;
import org.apache.thrift.transport.TTransportException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.net.HostAndPort;
import static com.google.common.util.concurrent.Uninterruptibles.sleepUninterruptibly;

public class ZooKeeperStatus implements Runnable {

    private static final Logger log = LoggerFactory.getLogger(ZooKeeperStatus.class);

    private volatile boolean stop = false;

    public static class ZooKeeperState implements Comparable<ZooKeeperState> {
        public final String keeper;
        public final String mode;
        public final int clients;

        public ZooKeeperState(String keeper, String mode, int clients) {
            this.keeper = keeper;
            this.mode = mode;
            this.clients = clients;
        }

        @Override
        public int hashCode() {
            return Objects.hashCode(keeper);
        }

        @Override
        public boolean equals(Object obj) {
            return obj == this
                    || (obj != null && obj instanceof ZooKeeperState && 0 == compareTo((ZooKeeperState) obj));
        }

        @Override
        public int compareTo(ZooKeeperState other) {
            if (this == other) {
                return 0;
            } else if (other == null) {
                return 1;
            } else {
                if (this.keeper == other.keeper) {
                    return 0;
                } else if (null == this.keeper) {
                    return -1;
                } else if (null == other.keeper) {
                    return 1;
                } else {
                    return this.keeper.compareTo(other.keeper);
                }
            }
        }
    }

    private static SortedSet<ZooKeeperState> status = new TreeSet<ZooKeeperState>();

    public static Collection<ZooKeeperState> getZooKeeperStatus() {
        return status;
    }

    @Override
    public void run() {

        while (!stop) {

            TreeSet<ZooKeeperState> update = new TreeSet<ZooKeeperState>();

            String zookeepers[] = SiteConfiguration.getInstance().get(Property.INSTANCE_ZK_HOST).split(",");
            for (String keeper : zookeepers) {
                int clients = 0;
                String mode = "unknown";

                String[] parts = keeper.split(":");
                TTransport transport = null;
                try {
                    HostAndPort addr;
                    if (parts.length > 1)
                        addr = HostAndPort.fromParts(parts[0], Integer.parseInt(parts[1]));
                    else
                        addr = HostAndPort.fromParts(parts[0], 2181);

                    transport = TTimeoutTransport.create(addr, 10 * 1000l);
                    transport.write("stat\n".getBytes(UTF_8), 0, 5);
                    StringBuilder response = new StringBuilder();
                    try {
                        transport.flush();
                        byte[] buffer = new byte[1024 * 100];
                        int n = 0;
                        while ((n = transport.read(buffer, 0, buffer.length)) > 0) {
                            response.append(new String(buffer, 0, n, UTF_8));
                        }
                    } catch (TTransportException ex) {
                        // happens at EOF
                    }
                    for (String line : response.toString().split("\n")) {
                        if (line.startsWith(" "))
                            clients++;
                        if (line.startsWith("Mode"))
                            mode = line.split(":")[1];
                    }
                    update.add(new ZooKeeperState(keeper, mode, clients));
                } catch (Exception ex) {
                    log.info("Exception talking to zookeeper " + keeper, ex);
                    update.add(new ZooKeeperState(keeper, "Down", -1));
                } finally {
                    if (transport != null) {
                        try {
                            transport.close();
                        } catch (Exception ex) {
                            log.error("Exception", ex);
                        }
                    }
                }
            }
            status = update;
            sleepUninterruptibly(5, TimeUnit.SECONDS);
        }
    }

}