kylin问题分析:org.apache.kylin.metadata.datatype.DataType.<clinit>(DataType.java:134)

最新推荐文章于 2021-05-17 16:05:42 发布

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博客指出kylin2.6.1使用spark引擎进行build cube任务时，自2.4.0至2.6.2版本存在异常。经源码分析，是因yarn集群服务器无kylin.properties文件但配置了KYLIN_HOME，导致文件检验失败抛异常。给出两种解决方案，一是扩大异常捕获范围，二是去掉yarn集群服务器的$KYLIN_HOME配置。

kylin2.6.1

使用spark引擎进行build cube任务的时候，出现如下异常，该异常自从kylin2.4.0版本至最新的kylin2.6.2版本依然存在。

19/05/05 17:36:42 WARN scheduler.TaskSetManager: Lost task 0.0 in stage 0.0 (TID 0, spslave4.bigdata.ly, executor 1): java.lang.ExceptionInInitializerError
        at org.apache.kylin.metadata.datatype.DataType.<clinit>(DataType.java:134)
        at java.io.ObjectStreamClass.hasStaticInitializer(Native Method)
        at java.io.ObjectStreamClass.computeDefaultSUID(ObjectStreamClass.java:1787)
        at java.io.ObjectStreamClass.access$100(ObjectStreamClass.java:72)
        at java.io.ObjectStreamClass$1.run(ObjectStreamClass.java:253)
        at java.io.ObjectStreamClass$1.run(ObjectStreamClass.java:251)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.io.ObjectStreamClass.getSerialVersionUID(ObjectStreamClass.java:250)
        at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:611)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1630)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1781)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2018)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1942)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
        at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1714)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2018)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1942)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2018)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1942)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:373)
        at java.util.HashSet.readObject(HashSet.java:333)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1058)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1909)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2018)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1942)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2018)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1942)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2018)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1942)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2018)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1942)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2018)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1942)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2018)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1942)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:373)
        at org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:75)
        at org.apache.spark.serializer.JavaSerializerInstance.deserialize(JavaSerializer.scala:114)
        at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:85)
        at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:53)
        at org.apache.spark.scheduler.Task.run(Task.scala:99)
        at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:325)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.RuntimeException: fail to locate kylin.properties
        at org.apache.kylin.common.KylinConfig.buildSiteOrderedProps(KylinConfig.java:378)
        at org.apache.kylin.common.KylinConfig.buildSiteProperties(KylinConfig.java:354)
        at org.apache.kylin.common.KylinConfig.getInstanceFromEnv(KylinConfig.java:134)
        at org.apache.kylin.measure.MeasureTypeFactory.init(MeasureTypeFactory.java:120)
        at org.apache.kylin.measure.MeasureTypeFactory.<clinit>(MeasureTypeFactory.java:98)
        ... 71 more

通过查看源码发现在MeasureTypeFactory这个类的init方法中有一段代码.
该代码的逻辑主要是读取配置文件中前缀为kylin.metadata.custom-measure-types.的配置项，从而获取自定义的MeasureType类型。由于在通过KylinConfig.getInstanceFromEnv来获取KylinConfig的时候报错，而try{}catch{}并没有捕获到该异常导致任务执行失败。

 try {
     Map<String, String> customMeasureTypes = KylinConfig.getInstanceFromEnv().getCubeCustomMeasureTypes();
     for (String customFactory : customMeasureTypes.values()) {
  try {
      logger.info("Checking custom measure types from kylin config: " + customFactory);
      factoryInsts.add((MeasureTypeFactory<?>) Class.forName(customFactory).newInstance());
  } catch (Exception e) {
      throw new IllegalArgumentException("Unrecognized MeasureTypeFactory classname: " + customFactory,
       e);
  }
     }
 } catch (KylinConfigCannotInitException e) {
     logger.warn("Will not add custome MeasureTypeFactory as KYLIN_CONF nor KYLIN_HOME is set");
 }

我们跟踪KylinConfig.getInstanceFromEnv()方法对应的代码，发现在执行buildSiteProperties()方法的时候报的错。

public static KylinConfig getInstanceFromEnv() {
        synchronized (KylinConfig.class) {
            KylinConfig config = THREAD_ENV_INSTANCE.get();
            if (config != null) {
                return config;
            }

            if (SYS_ENV_INSTANCE == null) {
                try {
                    //build default ordered properties will only be called once.
                    //This logic no need called by CoProcessor due to it didn't call getInstanceFromEnv.
                    buildDefaultOrderedProperties();

                    config = new KylinConfig();
                    config.reloadKylinConfig(buildSiteProperties());

                    logger.info("Initialized a new KylinConfig from getInstanceFromEnv : "
                            + System.identityHashCode(config));
                    SYS_ENV_INSTANCE = config;
                } catch (IllegalArgumentException e) {
                    throw new IllegalStateException("Failed to find KylinConfig ", e);
                }
            }
            return SYS_ENV_INSTANCE;
        }
    }

继续跟踪代码，是由于buildSiteOrderedProps()方法导致的错误。

private static Properties buildSiteProperties() {
        Properties conf = new Properties();

        OrderedProperties orderedProperties = buildSiteOrderedProps();
        for (Map.Entry<String, String> each : orderedProperties.entrySet()) {
            conf.put(each.getKey(), each.getValue().trim());
        }

        return conf;
    }

继续跟踪代码

 private static OrderedProperties buildSiteOrderedProps() {

        try {
            // 1. load default configurations from classpath.
            // we have kylin-defaults.properties in kylin/core-common/src/main/resources
            // Load them each time will caused thread block when multiple query request to Kylin
            OrderedProperties orderedProperties = new OrderedProperties();
            orderedProperties.putAll(defaultOrderedProperties);

            // 2. load site conf, to keep backward compatibility it's still named kylin.properties
            // actually it's better to be named kylin-site.properties
            File propFile = getSitePropertiesFile();
            if (propFile == null || !propFile.exists()) {
                logger.error("fail to locate " + KYLIN_CONF_PROPERTIES_FILE + " at '"
                        + (propFile != null ? propFile.getAbsolutePath() : "") + "'");
                throw new RuntimeException("fail to locate " + KYLIN_CONF_PROPERTIES_FILE);
            }
            loadPropertiesFromInputStream(new FileInputStream(propFile), orderedProperties);

            // 3. still support kylin.properties.override as secondary override
            // not suggest to use it anymore
            File propOverrideFile = new File(propFile.getParentFile(), propFile.getName() + ".override");
            if (propOverrideFile.exists()) {
                loadPropertiesFromInputStream(new FileInputStream(propOverrideFile), orderedProperties);
            }
            return orderedProperties;
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

跟踪getSitePropertiesFile() 方法。

  static File getSitePropertiesFile() {
        String kylinConfHome = System.getProperty(KYLIN_CONF);
        if (!StringUtils.isEmpty(kylinConfHome)) {
            logger.info("Use KYLIN_CONF=" + kylinConfHome);
            return existFile(kylinConfHome);
        }

        logger.debug("KYLIN_CONF property was not set, will seek KYLIN_HOME env variable");

        String kylinHome = getKylinHome();
        if (StringUtils.isEmpty(kylinHome))
            throw new KylinConfigCannotInitException("Didn't find KYLIN_CONF or KYLIN_HOME, please set one of them");

        logger.info("Use KYLIN_HOME=" + kylinHome);
        String path = kylinHome + File.separator + "conf";
        return existFile(path);
    }

发现getSitePropertiesFile()其实返回的是kylin配置文件存储的路径，该路径通过KYLIN_HOME环境变量添加/conf/kylin.properties获得，或者是通过KYLIN_CONF环境变量方式获取。
由于该段代码的执行是通过spark提交到yarn集群中运行的，而yarn集群所处的服务器并不存在kylin.properties配置文件，但是配置了KYLIN_HOME的环境变量，从而导致在进行proFile.exists()检验文件是否存在的时候，返回的false。从而抛出了RuntimeException。
而MeasureTypeFactory这个类的init方法只捕获了Exception并封装成IllegalArgumentException异常抛出，因此在此处便抛出异常，导致程序运行失败。

解决方案

方案一：对于没有自定义的MeasureType类型只需要简单修改异常捕获，扩大异常范围。

 try {
     Map<String, String> customMeasureTypes = KylinConfig.getInstanceFromEnv().getCubeCustomMeasureTypes();
     for (String customFactory : customMeasureTypes.values()) {
  try {
      logger.info("Checking custom measure types from kylin config: " + customFactory);
      factoryInsts.add((MeasureTypeFactory<?>) Class.forName(customFactory).newInstance());
  } catch (Exception e) {
      throw new IllegalArgumentException("Unrecognized MeasureTypeFactory classname: " + customFactory,
       e);
  }
     }
 } catch (Exception e) {
     logger.warn("Will not add custome MeasureTypeFactory as KYLIN_CONF nor KYLIN_HOME is set");
 }

方案二：在yarn集群的服务器中去掉$KYLIN_HOME的配置，这样代码就不会去读取$KYLIN_HOME下面相关的配置参数去初始化KylinConfig这个类了。