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背景

uber jvm profiler是用于在分布式监控收集jvm 相关指标，如:cpu/memory/io/gc信息等

安装

确保安装了maven和JDK>=8前提下，直接mvn clean package

java application

• 说明

  直接以java agent的部署就可以使用

• 使用

  java -javaagent:jvm-profiler-1.0.0.jar=reporter=com.uber.profiling.reporters.KafkaOutputReporter,brokerList='kafka1:9092',topicPrefix=demo_,tag=tag-demo,metricInterval=5000,sampleInterval=0 -cp target/jvm-profiler-1.0.0.jar

• 选项解释

参数	说明
reporter	reporter类别, 此处直接默认为com.uber.profiling.reporters.KafkaOutputReporter就可以
brokerList	如reporter为com.uber.profiling.reporters.KafkaOutputReporter,则brokerList为kafka列表,以逗号分隔
topicPrefix	如reporter为com.uber.profiling.reporters.KafkaOutputReporter,则topicPrefix为kafka topic的前缀
tag	key为tag的metric，会输出到reporter中
metricInterval	metric report的频率，根据实际情况设置，单位为ms
sampleInterval	jvm堆栈metrics report的频率，根据实际情况设置，单位为ms

• 结果展示

  "nonHeapMemoryTotalUsed": 11890584.0,
  "bufferPools": [
      {
          "totalCapacity": 0,
          "name": "direct",
          "count": 0,
          "memoryUsed": 0
      },
      {
          "totalCapacity": 0,
          "name": "mapped",
          "count": 0,
          "memoryUsed": 0
      }
  ],
  "heapMemoryTotalUsed": 24330736.0,
  "epochMillis": 1515627003374,
  "nonHeapMemoryCommitted": 13565952.0,
  "heapMemoryCommitted": 257425408.0,
  "memoryPools": [
      {
          "peakUsageMax": 251658240,
          "usageMax": 251658240,
          "peakUsageUsed": 1194496,
          "name": "Code Cache",
          "peakUsageCommitted": 2555904,
          "usageUsed": 1173504,
          "type": "Non-heap memory",
          "usageCommitted": 2555904
      },
      {
          "peakUsageMax": -1,
          "usageMax": -1,
          "peakUsageUsed": 9622920,
          "name": "Metaspace",
          "peakUsageCommitted": 9830400,
          "usageUsed": 9622920,
          "type": "Non-heap memory",
          "usageCommitted": 9830400
      },
      {
          "peakUsageMax": 1073741824,
          "usageMax": 1073741824,
          "peakUsageUsed": 1094160,
          "name": "Compressed Class Space",
          "peakUsageCommitted": 1179648,
          "usageUsed": 1094160,
          "type": "Non-heap memory",
          "usageCommitted": 1179648
      },
      {
          "peakUsageMax": 1409286144,
          "usageMax": 1409286144,
          "peakUsageUsed": 24330736,
          "name": "PS Eden Space",
          "peakUsageCommitted": 67108864,
          "usageUsed": 24330736,
          "type": "Heap memory",
          "usageCommitted": 67108864
      },
      {
          "peakUsageMax": 11010048,
          "usageMax": 11010048,
          "peakUsageUsed": 0,
          "name": "PS Survivor Space",
          "peakUsageCommitted": 11010048,
          "usageUsed": 0,
          "type": "Heap memory",
          "usageCommitted": 11010048
      },
      {
          "peakUsageMax": 2863661056,
          "usageMax": 2863661056,
          "peakUsageUsed": 0,
          "name": "PS Old Gen",
          "peakUsageCommitted": 179306496,
          "usageUsed": 0,
          "type": "Heap memory",
          "usageCommitted": 179306496
      }
  ],
  "processCpuLoad": 0.0008024004394748531,
  "systemCpuLoad": 0.23138430784607697,
  "processCpuTime": 496918000,
  "appId": null,
  "name": "24103@machine01",
  "host": "machine01",
  "processUuid": "3c2ec835-749d-45ea-a7ec-e4b9fe17c23a",
  "tag": "mytag",
  "gc": [
      {
          "collectionTime": 0,
          "name": "PS Scavenge",
          "collectionCount": 0
      },
      {
          "collectionTime": 0,
          "name": "PS MarkSweep",
          "collectionCount": 0
      }
  ]
}

spark application

• 说明

  和java应用不同，需要把jvm-profiler.jar分发到各个节点上

• 使用

     --jars hdfs:///public/libs/jvm-profiler-1.0.0.jar   
     --conf spark.driver.extraJavaOptions=-javaagent:jvm-profiler-1.0.0.jar=reporter=com.uber.profiling.reporters.KafkaOutputReporter,brokerList='kafka1:9092',topicPrefix=demo_,tag=tag-demo,metricInterval=5000,sampleInterval=0 
     --conf spark.executor.extraJavaOptions=-javaagent:jvm-profiler-1.0.0.jar=reporter=com.uber.profiling.reporters.KafkaOutputReporter,brokerList='kafka1:9092',topicPrefix=demo_,tag=tag-demo,metricInterval=5000,sampleInterval=0

• 选项解释

参数	说明
reporter	reporter类别, 此处直接默认为com.uber.profiling.reporters.KafkaOutputReporter就可以
brokerList	如reporter为com.uber.profiling.reporters.KafkaOutputReporter,则brokerList为kafka列表,以逗号分隔
topicPrefix	如reporter为com.uber.profiling.reporters.KafkaOutputReporter,则topicPrefix为kafka topic的前缀
tag	key为tag的metric，会输出到reporter中
metricInterval	metric report的频率，根据实际情况设置，单位为ms
sampleInterval	jvm堆栈metrics report的频率，根据实际情况设置，单位为ms

• 结果展示

  "nonHeapMemoryTotalUsed": 11890584.0,
  "bufferPools": [
      {
          "totalCapacity": 0,
          "name": "direct",
          "count": 0,
          "memoryUsed": 0
      },
      {
          "totalCapacity": 0,
          "name": "mapped",
          "count": 0,
          "memoryUsed": 0
      }
  ],
  "heapMemoryTotalUsed": 24330736.0,
  "epochMillis": 1515627003374,
  "nonHeapMemoryCommitted": 13565952.0,
  "heapMemoryCommitted": 257425408.0,
  "memoryPools": [
      {
          "peakUsageMax": 251658240,
          "usageMax": 251658240,
          "peakUsageUsed": 1194496,
          "name": "Code Cache",
          "peakUsageCommitted": 2555904,
          "usageUsed": 1173504,
          "type": "Non-heap memory",
          "usageCommitted": 2555904
      },
      {
          "peakUsageMax": -1,
          "usageMax": -1,
          "peakUsageUsed": 9622920,
          "name": "Metaspace",
          "peakUsageCommitted": 9830400,
          "usageUsed": 9622920,
          "type": "Non-heap memory",
          "usageCommitted": 9830400
      },
      {
          "peakUsageMax": 1073741824,
          "usageMax": 1073741824,
          "peakUsageUsed": 1094160,
          "name": "Compressed Class Space",
          "peakUsageCommitted": 1179648,
          "usageUsed": 1094160,
          "type": "Non-heap memory",
          "usageCommitted": 1179648
      },
      {
          "peakUsageMax": 1409286144,
          "usageMax": 1409286144,
          "peakUsageUsed": 24330736,
          "name": "PS Eden Space",
          "peakUsageCommitted": 67108864,
          "usageUsed": 24330736,
          "type": "Heap memory",
          "usageCommitted": 67108864
      },
      {
          "peakUsageMax": 11010048,
          "usageMax": 11010048,
          "peakUsageUsed": 0,
          "name": "PS Survivor Space",
          "peakUsageCommitted": 11010048,
          "usageUsed": 0,
          "type": "Heap memory",
          "usageCommitted": 11010048
      },
      {
          "peakUsageMax": 2863661056,
          "usageMax": 2863661056,
          "peakUsageUsed": 0,
          "name": "PS Old Gen",
          "peakUsageCommitted": 179306496,
          "usageUsed": 0,
          "type": "Heap memory",
          "usageCommitted": 179306496
      }
  ],
  "processCpuLoad": 0.0008024004394748531,
  "systemCpuLoad": 0.23138430784607697,
  "processCpuTime": 496918000,
  "appId": null,
  "name": "24103@machine01",
  "host": "machine01",
  "processUuid": "3c2ec835-749d-45ea-a7ec-e4b9fe17c23a",
  "tag": "mytag",
  "gc": [
      {
          "collectionTime": 0,
          "name": "PS Scavenge",
          "collectionCount": 0
      },
      {
          "collectionTime": 0,
          "name": "PS MarkSweep",
          "collectionCount": 0
      }
  ]
}

分析

• 已有的reporter

reporter	说明
ConsoleOutputReporter	默认的repoter，一般用于调试
FileOutputReporter	基于文件的reporter,分布式环境下不适用，得设置outputDir
KafkaOutputReporter	基于kafka的reporter，正式环境用的多，得设置brokerList，topicPrefix
GraphiteOutputReporter	基于Graphite的reporter,需设置graphite.host等配置
redisOutputReporter	基于redis的reporter，构建命令 mvn -P redis clean package
InfluxDBOutputReporter	基于InfluxDB的reporter，构建命令mvn -P influxdb clean package，需设置influxdb.host等配置

建议在生产环境下使用KafkaOutputReporter，操作灵活性高，可以结合clickhouse grafana进行指标展示

• 源码分析

  该jvm-profiler整体是基于java agent实现,项目pom文件 指定了MANIFEST.MF中的Premain-Class项和Agent-Class为com.uber.profiling.Agent 具体的实现类为AgentImpl
  就具体的AgentImpl类的run方法来进行分析

  public void run(Arguments arguments, Instrumentation instrumentation, Collection objectsToCloseOnShutdown) {
        if (arguments.isNoop()) {
            logger.info("Agent noop is true, do not run anything");
            return;
        }
  
        Reporter reporter = arguments.getReporter();
  
        String processUuid = UUID.randomUUID().toString();
  
        String appId = null;
  
        String appIdVariable = arguments.getAppIdVariable();
        if (appIdVariable != null && !appIdVariable.isEmpty()) {
            appId = System.getenv(appIdVariable);
        }
  
        if (appId == null || appId.isEmpty()) {
            appId = SparkUtils.probeAppId(arguments.getAppIdRegex());
        }
  
        if (!arguments.getDurationProfiling().isEmpty()
                || !arguments.getArgumentProfiling().isEmpty()) {
            instrumentation.addTransformer(new JavaAgentFileTransformer(arguments.getDurationProfiling(), arguments.getArgumentProfiling()));
        }
  
        List profilers = createProfilers(reporter, arguments, processUuid, appId);
  
        ProfilerGroup profilerGroup = startProfilers(profilers);
  
        Thread shutdownHook = new Thread(new ShutdownHookRunner(profilerGroup.getPeriodicProfilers(), Arrays.asList(reporter), objectsToCloseOnShutdown));
        Runtime.getRuntime().addShutdownHook(shutdownHook);
    }

   

• arguments.getReporter() 获取reporter，如果没有设置则设置为reporterConstructor,否则设置为指定的reporter

• String appId ,设置appId，首先从配置中查找，如果没有设置，再从env中查找，对于spark应用则取spark.app.id的值

• List profilers = createProfilers(reporter, arguments, processUuid, appId)，创建profilers,默认有CpuAndMemoryProfiler，ThreadInfoProfiler，ProcessInfoProfiler ；
  1.其中CpuAndMemoryProfiler，ThreadInfoProfiler，ProcessInfoProfiler是从JMX中读取数据，ProcessInfoProfiler还会从 /pro读取数据；
  2.如果设置了durationProfiling，argumentProfiling，sampleInterval，ioProfiling，则会增加对应的MethodDurationProfiler(输出方法调用花费的时间)，MethodArgumentProfiler(输出方法参数的值)，StacktraceReporterProfiler，IOProfiler；
  3.MethodArgumentProfiler和MethodDurationProfiler利用javassist第三方字节码编译工具来改写对应的类，具体实现参照JavaAgentFileTransformer
  4.StacktraceReporterProfiler从JMX中读取数据
  5.IOProfiler则是读取本地机器上的/pro文件对应的目录的数据

• ProfilerGroup profilerGroup = startProfilers(profilers) 开始进行profiler的定时report
  其中还会区分oneTimeProfilers和periodicProfilers，ProcessInfoProfiler就属于oneTimeProfilers，因为process的信息，在运行期间是不会变的，不需要周期行的reporter
  至此，整个流程结束

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