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【极速学习spark源码】一条 SQL 在 Spark 中的一生

【极速学习spark源码】一条 SQL 在 Spark 中的一生

基于 Spark 4.2,分支 branch-4.2

阅读时长约 10分钟 · 入门到中级


引子

写下这一行, 你已经写过几百次的代码:

spark.sql("SELECT name FROM users WHERE age > 18").show()

这句话背后,Spark 究竟做了哪些事?

如果你只能说出"解析、优化、生成 RDD",那么这篇文章想带你逐行走完这趟旅程——看清每个阶段的入口在哪里、产物是什么、什么时候发生、为什么这样设计。

读完之后,下次再看到一份执行计划,你应该能反过来推断它经过了哪些规则。


一、流程图:九个阶段,一根流水线

用户代码   │   ▼┌──────────────────── Driver 端,单线程 ────────────────────┐│                                                            ││  1. SparkSession.sql        ← 入口                         ││  2. Parser                  字符串 → Unresolved LogicalPlan││  3. Dataset.ofRows          创建 QueryExecution            ││  4. Analyzer                绑定 schema / 解析名字          ││  5. Command 急执行          (只 DDL/DML 走这步)            ││  6. Cache 替换 + 规范化     命中 cache 子树替换               ││  7. Optimizer               等价变换,求最优逻辑计划          ││  8. Planner                 LogicalPlan → SparkPlan        ││  9. Prepare for Execution   插 Exchange/Sort/Codegen 等    ││                                                            │└────────────────────────────────────────────────────────────┘   │   ▼ executedPlan.execute()┌──────────────────── 分布式执行 ──────────────────────────┐│  RDD → DAGScheduler → TaskScheduler → Executor → Task    │└──────────────────────────────────────────────────────────┘

两个最容易踩坑的认知

  • 前 8 步全部在 Driver 单线程跑。SQL "慢"如果慢在编译期,加 executor 数量不会有任何帮助。

  • DataFrame 并非完全 lazyspark.sql(...) 返回的瞬间 Analyzer 已经跑完(要知道 schema 才能给你返回 DataFrame);Optimizer / Planner 才真正等到 action 触发。


二、入口:SparkSession.sql

打开 SparkSession.scala:563:

def sql(sqlText: String, args: Array[_]): DataFrame = {  sql(sqlText, argsnew QueryPlanningTracker)}

每次调用都新建一个 QueryPlanningTracker。这个小对象贯穿整条路径,每个阶段都用它打卡。后面你能看到为什么这件事很重要。

真正干活的重载在 SparkSession.scala:528:

private[sql] def sql(sqlTextStringargsArray[_], trackerQueryPlanningTracker)    : DataFrame = withActive {  val plan = tracker.measurePhase(QueryPlanningTracker.PARSING) {    val parsed = sessionState.sqlParser.parsePlanWithParameters(sqlText, paramContext)    // ... 参数绑定处理 ...    parsed  }  Dataset.ofRows(self, plan, tracker)}

到这里就两件事:

  1. measurePhase("parsing") { ... } 包住 Parser,记录耗时

  2. 把解析出来的 LogicalPlan 交给 Dataset.ofRows

干净利落。


三、Parser:字符串变成树

Parser 的本职是 ANTLR4 工作。入口在 SparkSqlParser.scala:85,再往下就是 parsers.scala:59:

protected def parse[T](command: String)(toResult: SqlBaseParser => T): T = {  val lexer = new SqlBaseLexer(new UpperCaseCharStream(CharStreams.fromString(command)))  // ...  val tokenStream = new CommonTokenStream(lexer)  val parser = new SqlBaseParser(tokenStream)  // ...}

注意 UpperCaseCharStream——这就是 Spark SQL 关键字大小写不敏感的实现方式:lexer 看到的字符流统一是大写,但原始 token 文本保留。

从 AST 到 LogicalPlan 走访问者模式,由 SparkSqlAstBuilder(继承自 AstBuilder)完成。

代码:

val parsed = spark.sessionState.sqlParser.parsePlan(  "SELECT name FROM users WHERE age > 18")println(parsed)

输出:

'Project ['name]
+- 'Filter ('age > 18)
   +- 'UnresolvedRelation [users], [], false

注意:表不存在不会在这里报错。所有以 Unresolved 开头的节点都意味着"还没问过 catalog"。这是 Parser 的边界。


四、QueryExecution:阶段流水线的容器

接力棒在 SparkSession.scala:559 传给 Dataset.ofRows,看 Dataset.scala:111:

def ofRows(sparkSession: SparkSession, logicalPlan: LogicalPlan): DataFrame =  sparkSession.withActive {    val qe = sparkSession.sessionState.executePlan(logicalPlan)    if (!qe.isLazyAnalysis) qe.assertAnalyzed()    new Dataset[Row](qe, () => RowEncoder.encoderFor(qe.analyzed.schema)) }

两件事:

  1. 创建一个 QueryExecution,把未解析的逻辑计划塞进去

  2. 立即调用 assertAnalyzed() ——也就是上面说的"DataFrame 创建时 Analyzer 已经跑了"

为什么必须现在跑?因为接下来 RowEncoder.encoderFor(qe.analyzed.schema)(Dataset.scala:115)需要 schema,而 schema 只有在 Analyze 之后才有。

QueryExecution 本身是什么?它是后续所有阶段的懒加载容器。打开 QueryExecution.scala,看行192-394 那一长串你会发现一个清晰的模式:

private val lazyAnalyzed       = LazyTry { ... }   // 192private val lazyCommandExecuted = LazyTry { ... }  // 215private val lazyNormalized     = LazyTry { ... }   // 280private val lazyWithCachedData = LazyTry { ... }   // 289private val lazyOptimizedPlan  = LazyTry { ... }   // 313private val lazySparkPlan      = LazyTry { ... }   // 337private val lazyExecutedPlan   = LazyTry { ... }   // 355val      lazyToRdd             = LazyTry { ... }   // 378

每一阶段对应一个 LazyTry,外面包一层 def

def analyzed:      LogicalPlan = lazyAnalyzed.getdef optimizedPlan: LogicalPlan = lazyOptimizedPlan.getdef sparkPlan:     SparkPlan   = lazySparkPlan.getdef executedPlan:  SparkPlan   = lazyExecutedPlan.getdef toRdd:         RDD[InternalRow] = lazyToRdd.get

调试 SQL 编译过程的所有套路都建立在这上面:

df.queryExecution.analyzed       // 看 Analyzer 产物df.queryExecution.optimizedPlan  // 看 Optimizer 产物df.queryExecution.sparkPlan      // 看 Planner 产物df.queryExecution.executedPlan   // 看 Prepare 后的最终物理计划df.queryExecution.tracker.phases // 看每个阶段耗时

记住这五行。看任何 Spark SQL 性能问题,没有不是从这里入手的。


五、Analyzer:把名字绑定到东西

QueryExecution.scala:192:

private val lazyAnalyzed = LazyTry {  val plan = executePhase(QueryPlanningTracker.ANALYSIS) {    analyzer.executeAndCheck(sqlScriptExecuted, tracker)  }  tracker.setAnalyzed(plan)  plan}

具体到 Analyzer.scala:331:

def executeAndCheck(plan: LogicalPlan, tracker: QueryPlanningTracker): LogicalPlan = {  if (plan.analyzed) {    plan  } else {    def runAnalysis(): LogicalPlan =      HybridAnalyzer.fromLegacyAnalyzer(legacyAnalyzer = this, tracker = tracker).apply(plan)    // ...  }}

注意:4.x 引入了 HybridAnalyzer,老文章里直接讲的 Analyzer extends RuleExecutor 这条单链已经不准确。本文不展开 Hybrid 机制,只把它当成"Analyzer 的入口"。

Analyzer 的工作可以这样概括:一组规则按 fixed-point(不动点)反复跑,直到计划不再变化。每条规则负责消除一种 Unresolved

Unresolved谁来解析解析成什么
UnresolvedRelationResolveRelations去 catalog 查表,变成 LocalRelation / HiveTableRelation / DataSourceV2Relation 等
UnresolvedAttributeResolveReferences列名变成有 ExprId 的 AttributeReference
UnresolvedFunctionResolveFunctions函数名变成具体的 Expression 实现

代码

spark.range(100).toDF("id").createOrReplaceTempView("t")val df = spark.sql("SELECT id FROM t WHERE id > 10")println("=== Parsed ===")println(df.queryExecution.logical)   // 未解析println("=== Analyzed ===")println(df.queryExecution.analyzed)  // 已解析

输出:

=== Parsed ===
'Project ['id]
+- 'Filter ('id > 10)
   +- 'UnresolvedRelation [t], [], false

=== Analyzed ===
Project [id#1L]
+- Filter (id#1L > cast(10 as bigint))
   +- SubqueryAlias t
      +- View (`t`, [id#1L])
         +- Project [id#0L AS id#1L]
            +- Range (0, 100, step=1, splits=Some(1))

注意几个变化:

  1. 'id (未解析的 Attribute)变成 id#0L (已绑定 ExprId,类型是 long)

  2. UnresolvedRelation 被替换成具体的 SubqueryAlias + Project + Range

  3. 10 被自动 cast(10 as bigint) ——类型隐式转换也在 Analyzer 完成

如果有报错(找不到表、列名歧义、类型不匹配),抛出的 AnalysisException 也来自这一步。


六、Optimizer:等价变换求最优

QueryExecution.scala:313:

private val lazyOptimizedPlan = LazyTry {  assertCommandExecuted()  executePhase(QueryPlanningTracker.OPTIMIZATION) {    val plan = sparkSession.sessionState.optimizer      .executeAndTrack(withCachedData.clone(), tracker)    plan.setAnalyzed()    plan  }}

Optimizer 也是 RuleExecutor,但规则更多更狠。它的工作精神可以一句话概括:结果集等价的前提下,找一棵开销最小的计划树

最经典的几条:

规则干什么
ConstantFolding1 + 1 → 21 = 1 → true
BooleanSimplificationtrue AND x > 5 → x > 5
PushDownPredicates把 WHERE 推到 scan 节点附近,减少数据量
ColumnPruning只读取真正用到的列
CollapseProject合并相邻的 Project
LimitPushDown把 LIMIT 下推到 union / join 各分支

代码

val df = spark.sql("""  SELECT id FROM t  WHERE 1 = 1 AND id > 5 AND id IS NOT NULL""")println("=== Analyzed ===")println(df.queryExecution.analyzed)println("=== Optimized ===")println(df.queryExecution.optimizedPlan)

输出:

=== Analyzed ===
Project [id#13]
+- Filter (((1 = 1) AND (id#13 > 5)) AND isnotnull(id#13))
   +- SubqueryAlias users
      +- View (`users`, [id#13, name#14, age#15])
         +- Project [_1#3 AS id#13, _2#4 AS name#14, _3#5 AS age#15]
            +- LocalRelation [_1#3, _2#4, _3#5]

=== Optimized ===
Project [_1#3 AS id#13]
+- Filter (_1#3 > 5)
   +- LocalRelation [_1#3, _2#4, _3#5]
  • 1 = 1 被 ConstantFolding 折叠

  • true AND ... 被 BooleanSimplification 消去

  • id > 5 已经隐含了 id IS NOT NULL,多余的 IS NOT NULL 被 BooleanSimplification / InferFiltersFromConstraints 处理

关键提醒:Optimizer 的所有变换必须结果集等价。如果你看到 Optimizer 把你的 SQL 改成了一个"明显不一样"的形式但结果正确,不要慌——它就是干这个的。


七、Planner:从逻辑到物理

QueryExecution.scala:337:

private val lazySparkPlan = LazyTry {  assertOptimized()  val plan = executePhase(QueryPlanningTracker.PLANNING) {    QueryExecution.createSparkPlan(planner, optimizedPlan.clone())  }  attachTransaction(plan)}

createSparkPlan 的实现非常诚实,只有一行有效代码(QueryExecution.scala:808):

def createSparkPlan(planner: SparkPlanner, plan: LogicalPlan): SparkPlan = {  // TODO: We use next(), i.e. take the first plan returned by the planner, here for now,  //       but we will implement to choose the best plan.  planner.plan(ReturnAnswer(plan)).next()}

源码里那条 TODO 揭示了一个真相:Spark 的 planner 理论上能产出多个候选物理计划(Iterator[SparkPlan]),但当前实现就是粗暴地 .next() 取第一个。所谓"基于代价的优化"(CBO)主要发生在 Optimizer 阶段,而不是这里。

Planner 的工作机制是 Strategy 模式。看 SparkPlanner.scala:38:

override def strategies: Seq[Strategy] =  experimentalMethods.extraStrategies ++    extraPlanningStrategies ++ (    LogicalQueryStageStrategy ::    PythonEvals ::    new DataSourceV2Strategy(session) ::    V2CommandStrategy ::    FileSourceStrategy ::    DataSourceStrategy ::    SpecialLimits ::    Aggregation ::    Window ::    WindowGroupLimit ::    JoinSelection ::         // ← BHJ / SMJ / SHJ 在这里决定    InMemoryScans ::    SparkScripts ::    Pipelines ::    BasicOperators ::    EventTimeWatermarkStrategy :: Nil)

每个 Strategy 都是一个偏函数:匹配某种 LogicalPlan 形态,吐出对应的 SparkPlan。比如:

  • FileSourceStrategy 把 LogicalRelation(HadoopFsRelation) 翻译成 FileSourceScanExec

  • JoinSelection 看 join 两边的 size 和 hint,决定生成 BroadcastHashJoinExec / SortMergeJoinExec / ShuffledHashJoinExec

  • Aggregation 选择 HashAggregateExec 还是 SortAggregateExec

Strategy 顺序很重要:靠前的 Strategy 优先匹配。所以 LogicalQueryStageStrategy(AQE 的)排在最前面。


八、Prepare for Execution:最后一公里

走到这里你已经有一棵 SparkPlan 了,但不能直接执行——它还缺:

  • shuffle / sort(如果上游没满足下游的分区或排序要求)

  • WholeStageCodegen 包装(合并能融合的算子)

  • AQE 包装(如果启用)

  • subquery 物化

  • ……

这些都在 prepareForExecution 里加。看 QueryExecution.scala:752:

private[execution] def preparations(    sparkSession: SparkSession,    adaptiveExecutionRule: Option[InsertAdaptiveSparkPlan] = None,    subquery: Boolean): Seq[Rule[SparkPlan]] = {  adaptiveExecutionRule.toSeq ++  Seq(    CoalesceBucketsInJoin,    PlanDynamicPruningFilters(sparkSession),    PlanSubqueries(sparkSession),    RemoveRedundantProjects,    EnsureRequirements(),    InsertSortForLimitAndOffset,    ReplaceHashWithSortAgg,    RemoveRedundantSorts,    RemoveRedundantWindowGroupLimits,    DisableUnnecessaryBucketedScan,    ApplyColumnarRulesAndInsertTransitions(...),    CollapseCodegenStages()  ) ++ (if (subquery) Nil else Seq(ReuseExchangeAndSubquery))}

要记住的就两条:

  • EnsureRequirements 是 Exchange 的来源。所有的 shuffle 节点都不是 Planner 生成的,是这一步根据 requiredChildDistribution 推断出来的。

  • CollapseCodegenStages 是 WholeStageCodegen 的来源。看到 *(N) HashAggregate 这种带星号的算子,就是被它打包了。

关于 AQE 的提醒:如果 AQE 启用,InsertAdaptiveSparkPlan 会把整个计划包进 AdaptiveSparkPlanExec——一个 leaf node。后面所有规则因此都变成 no-op(leaf node 没有子树可改)。真正的 prepare 推迟到 AQE 内部按 stage 逐段做。


九、Execute:进入分布式世界

QueryExecution.scala:378:

val lazyToRdd = LazyTry {  new SQLExecutionRDD(executedPlan.execute(), sparkSession.sessionState.conf)}

executedPlan.execute() 触发整棵物理计划的递归 doExecute() 调用,从叶子(scan)到根,最终构建出一棵 RDD 血缘。

到这里 Catalyst 的工作就完成了。调用 df.show() / df.collect() / df.count() 等 action 时,才会触发 SparkContext.runJob(rdd, ...),由 DAGScheduler 把 RDD 切成 Stage 和 Task 推到 Executor。

那是另一篇文章的故事(系列文章 #2)。


十、实战:把九个阶段一次看个够

把所有工具组合起来:

spark.range(100).toDF("id").createOrReplaceTempView("t")val sql = "SELECT id FROM t WHERE id > 10 AND 1 = 1"val df = spark.sql(sql)println("\n=== 1. Parser 单独跑 ===")println(spark.sessionState.sqlParser.parsePlan(sql))println("\n=== 2. Analyzed ===")println(df.queryExecution.analyzed)println("\n=== 3. Optimized ===")println(df.queryExecution.optimizedPlan)println("\n=== 4. SparkPlan (未 prepare) ===")println(df.queryExecution.sparkPlan)println("\n=== 5. ExecutedPlan (已 prepare) ===")println(df.queryExecution.executedPlan)// 触发执行,让 tracker 数据完整df.collect()println("\n=== 6. 各阶段耗时 ===")df.queryExecution.tracker.phases.foreach { case (name, summary) =>  println(f"$name%-20s ${summary.endTimeMs - summary.startTimeMs}%5d ms")}

把这段在你本地的 Spark 4.x 上跑一遍,对照前面九节的描述,你会看到:

  • 第 1 步出 UnresolvedRelationUnresolvedAttribute

  • 第 2 步所有 Unresolved 消失,类型补齐

  • 第 3 步 1 = 1 折叠掉

  • 第 4 步出现具体物理算子(*Range*Filter*Project

  • 第 5 步可能多了 WholeStageCodegen 包装

  • 第 6 步打印出 parsing / analysis / optimization / planning 四个阶段的耗时


十一、总结

回顾:

spark.sql(sqlText)      └─ SparkSqlParser.parsePlan          → Unresolved LogicalPlan            └─ Dataset.ofRows                  └─ QueryExecution (lazy 容器)                        ├─ analyzer.executeAndCheck    → Analyzed LogicalPlan                        ├─ cacheManager.useCachedData  → Normalized                        ├─ optimizer.executeAndTrack   → Optimized LogicalPlan                        ├─ planner.plan(...).next()    → SparkPlan                        ├─ prepareForExecution         → ExecutedPlan                        └─ executedPlan.execute()      → RDD[InternalRow]                                                              │                                                              ▼                                                   action → DAGScheduler → ...

三个最值得带走的认知

  1. Spark SQL 的"编译期"很长。前 8 步全部串行跑在 Driver 上。如果你的 SQL 已经在 df.queryExecution.executedPlan 卡了好几秒,加机器没用——需要看 Optimizer / Planner 是哪条规则慢。

  2. DataFrame 的 lazy 不彻底。Analyzer 在 spark.sql(...) 返回前就跑完了。表不存在、列名错这类错误立刻抛;但 Optimizer/Planner 要等 action。

  3. df.queryExecution.{analyzed, optimizedPlan, sparkPlan, executedPlan, tracker} 是性能调优的瑞士军刀。任何 Spark SQL 性能问题都从这里下手。


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  1. CONNECT:[ UseTime:0.001087s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001613s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000341s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000283s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000592s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000511s ]
  8. SELECT * FROM `article` WHERE `id` = 735020 LIMIT 1 [ RunTime:0.000747s ]
  9. UPDATE `article` SET `lasttime` = 1781203000 WHERE `id` = 735020 [ RunTime:0.001031s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000244s ]
  11. SELECT * FROM `article` WHERE `id` < 735020 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000558s ]
  12. SELECT * FROM `article` WHERE `id` > 735020 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000382s ]
  13. SELECT * FROM `article` WHERE `id` < 735020 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000735s ]
  14. SELECT * FROM `article` WHERE `id` < 735020 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000804s ]
  15. SELECT * FROM `article` WHERE `id` < 735020 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000664s ]
0.191519s