quartz监控日志（三）查看卡死线程堆栈

谁借莪１个温暖的怀抱￠ 2022-04-06 09:36 245阅读 0赞

我们经常碰到一些定时任务卡死或者执行时间很长，这样的问题我们排查手段比较常用的是jstack命令

来查看线程堆栈，然后根据我们监控中的threadId或者threadName来查找线程详细堆栈看卡在哪个方法。

常用命令如下：

jstack pid >jstack.log

现在我们可以提供界面查看卡死线程堆栈

controller代码

@RequestMapping("/getStackTrace")
    	@ResponseBody
    	public String getStackStace(HttpServletRequest request, HttpServletResponse response) {
    		logger.debug("执行选择的Job对象 queryQuartzLog quartzLog:");
    		try {
    			String threadId=request.getParameter("threadId");
    			if(StringUtils.isBlank(threadId)){
    				return "";
    			}
    			
    		    ThreadInfo info = ThreadUtilities.getExtendThreadInfo(Long.valueOf(threadId));
    		    List<String> list=new ArrayList<String>();
    		    StackTraceElement[] st=info.getStackTrace();
    		    int index=0;
    		    MonitorInfo[] monitors=info.getLockedMonitors();
    		    for(StackTraceElement e:st){ 
    		    	StringBuffer sb=new StringBuffer();
    		        if(index>0){  
    		        	sb.append(" <- ");  
    		        	sb.append(System.getProperty("line.separator"));  
    		        }  
    		        sb.append(e.toString()+ "\n");
    		        list.add(sb.toString());
    		        if (monitors != null) {
    					for (MonitorInfo mi : monitors) {
    						if (mi.getLockedStackDepth() == index) {
    							list.add(" <- -     locked   "+mi.toString());
    						}
    					}
    				}
    				index++;
    		    }  
    			return generateHtml("vm/getStackTrace.vm", list);
    		} catch (Exception e) {
    			logger.error("doRunQuartzJob 执行选择的Job对象出错", e);
    			return "fail";
    		}
    	}

ThreadUtilities.getExtendThreadInfo

public static ThreadInfo getExtendThreadInfo(final long threadID) {
    		ThreadInfo ti = null;
    		final ThreadMXBean threadMBean = ManagementFactory.getThreadMXBean();
    		if (threadMBean.isObjectMonitorUsageSupported()) {
    			// VMs that support the monitor usage monitoring
    			ThreadInfo[] infos = threadMBean.dumpAllThreads(true, false);
    			for (ThreadInfo info : infos) {
    				if (info.getThreadId() == threadID) {
    					ti = info;
    					break;
    				}
    			}
    		} else {
    			// VM doesn't support monitor usage monitoring
    			ti = threadMBean.getThreadInfo(threadID, Integer.MAX_VALUE);
    		}
    		return ti;
    	}

然后通过vm代码将堆栈展示在页面上

getStackTrace.vm

<!DOCTYPE html>
    <html lang="zh-cn">
     <head> 
      <meta charset="UTF-8" /> 
      <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" /> 
      <meta name="description" content="" /> 
      <meta name="Keywords" content="" />
      <title>job logs</title>
     </head>
     <body>
      <div>
       	#foreach($element in $data)
       	$element<br/>
       	#end
      </div>
     </body>
    </html>

public class BaseController {
    	private static final VelocityEngine ve = new VelocityEngine(); 
    	private static final Logger logger = LoggerFactory.getLogger(QuartzController.class);
    	
    	static{
    		// 初始化Velocity引擎  
            InputStream is = BaseController.class.getResourceAsStream("/velocity.properties");  
            Properties properties = new Properties();  
            try {  
                properties.load(is);  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
            ve.init(properties);  
    	}
    	public String generateHtml(String vmTemplate,Object obj){
    		StringWriter sw = new StringWriter();
    		try {
    			VelocityContext ctx = new VelocityContext();
    			ctx.put("data", obj);
    			ve.getTemplate(vmTemplate,"UTF-8").merge(ctx, sw);
    		} catch (Exception e) {
    			logger.error("转化vm模板出错",e);
    		}finally{
    			if(sw!=null){
    				try {
    					sw.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
    		}
    		return sw.toString();
    		
    	}
    }