| /* |
| * 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.hadoop.hbase; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hbase.HealthChecker.HealthCheckerExitStatus; |
| import org.apache.hadoop.util.StringUtils; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * The Class HealthCheckChore for running health checker regularly. |
| */ |
| @InterfaceAudience.Private |
| public class HealthCheckChore extends ScheduledChore { |
| private static final Logger LOG = LoggerFactory.getLogger(HealthCheckChore.class); |
| private HealthChecker healthChecker; |
| private Configuration config; |
| private int threshold; |
| private int numTimesUnhealthy = 0; |
| private long failureWindow; |
| private long startWindow; |
| |
| public HealthCheckChore(int sleepTime, Stoppable stopper, Configuration conf) { |
| super("HealthChecker", stopper, sleepTime); |
| LOG.info("Health Check Chore runs every " + StringUtils.formatTime(sleepTime)); |
| this.config = conf; |
| String healthCheckScript = this.config.get(HConstants.HEALTH_SCRIPT_LOC); |
| long scriptTimeout = this.config.getLong(HConstants.HEALTH_SCRIPT_TIMEOUT, |
| HConstants.DEFAULT_HEALTH_SCRIPT_TIMEOUT); |
| healthChecker = new HealthChecker(); |
| healthChecker.init(healthCheckScript, scriptTimeout); |
| this.threshold = config.getInt(HConstants.HEALTH_FAILURE_THRESHOLD, |
| HConstants.DEFAULT_HEALTH_FAILURE_THRESHOLD); |
| this.failureWindow = (long)this.threshold * (long)sleepTime; |
| } |
| |
| @Override |
| protected void chore() { |
| HealthReport report = healthChecker.checkHealth(); |
| boolean isHealthy = (report.getStatus() == HealthCheckerExitStatus.SUCCESS); |
| if (!isHealthy) { |
| boolean needToStop = decideToStop(); |
| if (needToStop) { |
| this.getStopper().stop("The node reported unhealthy " + threshold |
| + " number of times consecutively."); |
| } |
| // Always log health report. |
| LOG.info("Health status at " + StringUtils.formatTime(System.currentTimeMillis()) + " : " |
| + report.getHealthReport()); |
| } |
| } |
| |
| private boolean decideToStop() { |
| boolean stop = false; |
| if (numTimesUnhealthy == 0) { |
| // First time we are seeing a failure. No need to stop, just |
| // record the time. |
| numTimesUnhealthy++; |
| startWindow = System.currentTimeMillis(); |
| } else { |
| if ((System.currentTimeMillis() - startWindow) < failureWindow) { |
| numTimesUnhealthy++; |
| if (numTimesUnhealthy == threshold) { |
| stop = true; |
| } else { |
| stop = false; |
| } |
| } else { |
| // Outside of failure window, so we reset to 1. |
| numTimesUnhealthy = 1; |
| startWindow = System.currentTimeMillis(); |
| stop = false; |
| } |
| } |
| return stop; |
| } |
| |
| } |