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https://issues.apache.org/jira/browse/SPARK-13371?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guoqiang Li updated SPARK-13371:
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Comment: was deleted
(was: [~srowen] Of course not.)
> TaskSetManager.dequeueSpeculativeTask compares Option[String] and String
> directly.
> ----------------------------------------------------------------------------------
>
> Key: SPARK-13371
> URL: https://issues.apache.org/jira/browse/SPARK-13371
> Project: Spark
> Issue Type: Bug
> Components: Scheduler
> Affects Versions: 1.5.2, 1.6.0
> Reporter: Guoqiang Li
>
> {noformat}
> TaskSetManager.dequeueSpeculativeTask compares Option[String] and String
> directly.
> {noformat}
> Ths code:
> https://github.com/apache/spark/blob/87abcf7df921a5937fdb2bae8bfb30bfabc4970a/core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala#L344
> {code}
> if (TaskLocality.isAllowed(locality, TaskLocality.RACK_LOCAL)) {
> for (rack <- sched.getRackForHost(host)) {
> for (index <- speculatableTasks if canRunOnHost(index)) {
> val racks =
> tasks(index).preferredLocations.map(_.host).map(sched.getRackForHost)
> // racks: Seq[Option[String]] and rack: String
> if (racks.contains(rack)) {
> speculatableTasks -= index
> return Some((index, TaskLocality.RACK_LOCAL))
> }
> }
> }
> }
> {code}
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