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https://issues.apache.org/jira/browse/SPARK-18462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15675234#comment-15675234
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Apache Spark commented on SPARK-18462:
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User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/15922
> SparkListenerDriverAccumUpdates event does not deserialize properly in
> history server
> -------------------------------------------------------------------------------------
>
> Key: SPARK-18462
> URL: https://issues.apache.org/jira/browse/SPARK-18462
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Josh Rosen
> Assignee: Josh Rosen
>
> The following test fails with a ClassCastException due to oddities in how
> Jackson object mapping works, breaking the SQL tab in the history server:
> {code}
> +++
> b/sql/core/src/test/scala/org/apache/spark/sql/execution/ui/SQLListenerSuite.scala
> @@ -19,6 +19,7 @@ package org.apache.spark.sql.execution.ui
> import java.util.Properties
> +import org.json4s.jackson.JsonMethods._
> import org.mockito.Mockito.mock
> import org.apache.spark._
> @@ -35,7 +36,7 @@ import org.apache.spark.sql.execution.{LeafExecNode,
> QueryExecution, SparkPlanIn
> import org.apache.spark.sql.execution.metric.{SQLMetric, SQLMetrics}
> import org.apache.spark.sql.test.SharedSQLContext
> import org.apache.spark.ui.SparkUI
> -import org.apache.spark.util.{AccumulatorMetadata, LongAccumulator}
> +import org.apache.spark.util.{AccumulatorMetadata, JsonProtocol,
> LongAccumulator}
> class SQLListenerSuite extends SparkFunSuite with SharedSQLContext {
> @@ -416,6 +417,20 @@ class SQLListenerSuite extends SparkFunSuite with
> SharedSQLContext {
> assert(driverUpdates(physicalPlan.longMetric("dummy").id) ==
> expectedAccumValue)
> }
> + test("roundtripping SparkListenerDriverAccumUpdates through JsonProtocol")
> {
> + val event = SparkListenerDriverAccumUpdates(1L, Seq((2L, 3L)))
> + val actualJsonString =
> compact(render(JsonProtocol.sparkEventToJson(event)))
> + val newEvent = JsonProtocol.sparkEventFromJson(parse(actualJsonString))
> + newEvent match {
> + case SparkListenerDriverAccumUpdates(executionId, accums) =>
> + assert(executionId == 1L)
> + accums.foreach { case (a, b) =>
> + assert(a == 2L)
> + assert(b == 3L)
> + }
> + }
> + }
> +
> {code}
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