背景

数据血缘是数据资产管理非常重要的一部份，团队现在已经实现通过 Hook 上报 Hive SQL 任务数据血缘，通过 impala lineage 日志获取 impala 任务数据血缘。随着 Spark SQL 计算引擎的使用，现针对该场景设计可行的血缘获取方案。

方案

思路分析

在spark的源码中，以Scala的形式提供了一个org.apache.spark.sql.util.QueryExecutionListener trait （类似Java 语言的接口），来作为Spark SQL等任务执行的监听器。在org.apache.spark.sql.util.QueryExecutionListener 中提供了 onSuccess 和 onFailure 两个方法。

/**
 * The interface of query execution listener that can be used to analyze execution metrics.
 *
 * @note Implementations should guarantee thread-safety as they can be invoked by
 * multiple different threads.
 */
trait QueryExecutionListener {

  /**
   * A callback function that will be called when a query executed successfully.
   *
   * @param funcName name of the action that triggered this query.
   * @param qe the QueryExecution object that carries detail information like logical plan,
   *           physical plan, etc.
   * @param durationNs the execution time for this query in nanoseconds.
   *
   * @note This can be invoked by multiple different threads.
   */
  @DeveloperApi
  def onSuccess(funcName: String, qe: QueryExecution, durationNs: Long): Unit

  /**
   * A callback function that will be called when a query execution failed.
   *
   * @param funcName the name of the action that triggered this query.
   * @param qe the QueryExecution object that carries detail information like logical plan,
   *           physical plan, etc.
   * @param exception the exception that failed this query. If `java.lang.Error` is thrown during
   *                  execution, it will be wrapped with an `Exception` and it can be accessed by
   *                  `exception.getCause`.
   * @note This can be invoked by multiple different threads.
   */
  @DeveloperApi
  def onFailure(funcName: String, qe: QueryExecution, exception: Exception): Unit
}

开发一个类实现 QueryExecutionListener 中的 onSuccess 方法，在SPARK SQL 执行成功后，通过从 QueryExecution 中解析 LogicalPlan，获取表级别数据血缘（当前团队需求未细化到字段级别），并将结果通过 http 上报到数据资产平台后端服务。

代码开发

在下面代码中主要实现了 QueryExecutionListener 的 onSuccess 方法：

import com.fasterxml.jackson.annotation.JsonInclude
import com.fasterxml.jackson.databind.ObjectMapper
import common.dto.{LineageInfo, LineageReport, TableInfo}
import org.apache.http.client.methods.{CloseableHttpResponse, HttpPost}
import org.apache.http.entity.StringEntity
import org.apache.http.impl.client.HttpClients
import org.apache.spark.internal.Logging
import org.apache.spark.sql.catalyst.catalog.HiveTableRelation
import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
import org.apache.spark.sql.execution.QueryExecution
import org.apache.spark.sql.execution.datasources.LogicalRelation
import org.apache.spark.sql.hive.execution.{CreateHiveTableAsSelectCommand, InsertIntoHiveTable}
import org.apache.spark.sql.util.QueryExecutionListener

import scala.collection.JavaConverters._
import scala.collection.mutable
import scala.util.control.NonFatal
import java.util

class LineageReportListener extends QueryExecutionListener with Logging {

  override def onSuccess(funcName: String, qe: QueryExecution, durationNs: Long): Unit = withErrorHandling(qe) {

    if (!funcName.equals("command"))
      return

    val queryCommand = qe.sparkSession.sparkContext.getConf.get("spark.sql.query.command")
    if (!queryCommand.toLowerCase.contains("insert"))
      return

    val sourceTableSet: mutable.HashSet[TableInfo] = mutable.HashSet()
    val targetTableSet: mutable.HashSet[TableInfo] = mutable.HashSet()

    val plan: LogicalPlan = qe.analyzed

    plan.collect {
      case plan: LogicalRelation =>
        val catalogTable = plan.catalogTable.get
        plan.output.foreach(_ => {
          sourceTableSet += new TableInfo(catalogTable.database, catalogTable.identifier.table)
        })

      case plan: HiveTableRelation =>
        plan.output.foreach(_ => {
          sourceTableSet += new TableInfo(plan.tableMeta.database, plan.tableMeta.identifier.table)
        })

      case plan: InsertIntoHiveTable =>
        plan.query.output.foreach(_ => {
          targetTableSet += new TableInfo(plan.table.database, plan.table.identifier.table)
        })

      case plan: CreateHiveTableAsSelectCommand =>
        plan.query.output.foreach(_ => {
          targetTableSet += new TableInfo(plan.tableDesc.database, plan.tableDesc.identifier.table)
        })
    }

    if (sourceTableSet.nonEmpty && targetTableSet.size == 1) {
      val objectMapper: ObjectMapper = new ObjectMapper()
      objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL)

      val sourceTableList: util.List[TableInfo] = sourceTableSet.toList.asJava
      val targetTable: TableInfo = targetTableSet.toList.asJava.get(0)
      val lineageDTO: LineageReport = new LineageReport("sparkSQL", new LineageInfo(queryCommand, sourceTableList, targetTable))

      val url = qe.sparkSession.sparkContext.getConf.get("spark.sql.lineage.report.url")
      reportLineageInfo(url, objectMapper.writeValueAsString(lineageDTO))
    }
  }

  override def onFailure(funcName: String, qe: QueryExecution, exception: Exception): Unit = withErrorHandling(qe) {

  }


  private def withErrorHandling(qe: QueryExecution)(body: => Unit): Unit = {
    try
      body
    catch {
      case NonFatal(e) =>
        val ctx = qe.sparkSession.sparkContext
        println(s"Lineage Parsing Failed for Application: ${ctx.appName} #${ctx.applicationId}", e)
    }
  }


  private def reportLineageInfo(url: String, jsonStr: String): Unit = {
    val httpClient = HttpClients.createDefault()
    val post = new HttpPost(url)
    post.setHeader("Content-Type", "application/json")
    post.setEntity(new StringEntity(jsonStr, "UTF-8"))
    var response: CloseableHttpResponse = null
    try {
      response = httpClient.execute(post)
      if (response.getStatusLine.getStatusCode == 200)
        println("Lineage Report Success: " + jsonStr)
      else
        println("Lineage Report Failed: " + jsonStr)
    } finally {
      try {
        httpClient.close()
        response.close()
      } catch {
        case e: Exception =>
          e.printStackTrace()
      }
    }
  }
}

SQL语句获取

数据资产平台后台服务需要同时上报用户提交的SQL内容。
在上述代码中可以看到，val queryCommand = qe.sparkSession.sparkContext.getConf.get("spark.sql.query.command") 在 sparkContext 从 sparkConf 中get配置项 spark.sql.query.command ，由此获得完整的SQL脚本。
该配置项需要修改 SPARK 源码，在提交SQL时将sql内容添加到 SparkConf 中。
在 spark-sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkSQLDriver.scala 中添加一行代码 context.sparkContext.conf.set("spark.sql.query.command", command)

override def run(command: String): CommandProcessorResponse = {
    try {
      val substitutorCommand = SQLConf.withExistingConf(context.conf) {
        new VariableSubstitution().substitute(command)
      }
      context.sparkContext.setJobDescription(substitutorCommand)
      context.sparkContext.conf.set("spark.sql.query.command", command)
      val execution = context.sessionState.executePlan(context.sql(command).logicalPlan)
      hiveResponse = SQLExecution.withNewExecutionId(execution, Some("cli")) {
        hiveResultString(execution.executedPlan)
      }
      tableSchema = getResultSetSchema(execution)
      new CommandProcessorResponse(0)
    } catch {
        case st: SparkThrowable =>
          logDebug(s"Failed in [$command]", st)
          new CommandProcessorResponse(1, ExceptionUtils.getStackTrace(st), st.getSqlState, st)
        case cause: Throwable =>
          logError(s"Failed in [$command]", cause)
          new CommandProcessorResponse(1, ExceptionUtils.getStackTrace(cause), null, cause)
    }
  }