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https://issues.apache.org/jira/browse/SPARK-25429?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-25429:
------------------------------------
Assignee: (was: Apache Spark)
> SparkListenerBus inefficient due to
> 'LiveStageMetrics#accumulatorIds:Array[Long]' data structure
> ------------------------------------------------------------------------------------------------
>
> Key: SPARK-25429
> URL: https://issues.apache.org/jira/browse/SPARK-25429
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.3.1
> Reporter: DENG FEI
> Priority: Major
>
> {code:java}
> private def updateStageMetrics(
> stageId: Int,
> attemptId: Int,
> taskId: Long,
> accumUpdates: Seq[AccumulableInfo],
> succeeded: Boolean): Unit = {
> Option(stageMetrics.get(stageId)).foreach { metrics =>
> if (metrics.attemptId != attemptId || metrics.accumulatorIds.isEmpty) {
> return
> }
> val oldTaskMetrics = metrics.taskMetrics.get(taskId)
> if (oldTaskMetrics != null && oldTaskMetrics.succeeded) {
> return
> }
> val updates = accumUpdates
> .filter { acc => acc.update.isDefined &&
> metrics.accumulatorIds.contains(acc.id) }
> .sortBy(_.id)
> if (updates.isEmpty) {
> return
> }
> val ids = new Array[Long](updates.size)
> val values = new Array[Long](updates.size)
> updates.zipWithIndex.foreach { case (acc, idx) =>
> ids(idx) = acc.id
> // In a live application, accumulators have Long values, but when
> reading from event
> // logs, they have String values. For now, assume all accumulators
> are Long and covert
> // accordingly.
> values(idx) = acc.update.get match {
> case s: String => s.toLong
> case l: Long => l
> case o => throw new IllegalArgumentException(s"Unexpected: $o")
> }
> }
> // TODO: storing metrics by task ID can cause metrics for the same task
> index to be
> // counted multiple times, for example due to speculation or
> re-attempts.
> metrics.taskMetrics.put(taskId, new LiveTaskMetrics(ids, values,
> succeeded))
> }
> }
> {code}
> 'metrics.accumulatorIds.contains(acc.id)', if large SQL application generated
> many accumulator, it's inefficient use Arrray#contains.
> Actually, application may timeout while quit and will killed by RM on YARN
> mode.
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