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https://issues.apache.org/jira/browse/SPARK-22227?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-22227:
------------------------------------
Assignee: Apache Spark
> DiskBlockManager.getAllBlocks could fail if called during shuffle
> -----------------------------------------------------------------
>
> Key: SPARK-22227
> URL: https://issues.apache.org/jira/browse/SPARK-22227
> Project: Spark
> Issue Type: Bug
> Components: Block Manager
> Affects Versions: 2.2.0
> Reporter: Sergei Lebedev
> Assignee: Apache Spark
> Priority: Minor
>
> {{DiskBlockManager.getAllBlocks}} assumes that the directories managed by the
> block manager only contains files corresponding to "valid" block IDs, i.e.
> those parsable via {{BlockId.apply}}. This is not always the case as
> demonstrated by the following snippet
> {code}
> object GetAllBlocksFailure {
> def main(args: Array[String]): Unit = {
> val sc = new SparkContext(new SparkConf()
> .setMaster("local[*]")
> .setAppName("demo"))
> new Thread {
> override def run(): Unit = {
> while (true) {
>
> println(SparkEnv.get.blockManager.diskBlockManager.getAllBlocks().length)
> Thread.sleep(10)
> }
> }
> }.start()
> val rdd = sc.range(1, 65536, numSlices = 10)
> .map(x => (x % 4096, x))
> .persist(StorageLevel.DISK_ONLY)
> .reduceByKey { _ + _ }
> .collect()
> }
> }
> {code}
> We have a thread computing the number of bytes occupied by the block manager
> on-disk and it frequently crashes due to this assumption being violated.
> Relevant part of the stacktrace
> {code}
> 2017-10-06 11:20:14,287 ERROR
> org.apache.spark.util.SparkUncaughtExceptionHandler: Uncaught exception in
> thread Thread[CoarseGrainedExecutorBackend-stop-executor,5,main]
> java.lang.IllegalStateException: Unrecognized BlockId:
> shuffle_1_2466_0.data.5684dd9e-9fa2-42f5-9dd2-051474e372be
> at org.apache.spark.storage.BlockId$.apply(BlockId.scala:133)
> at
> org.apache.spark.storage.DiskBlockManager$$anonfun$getAllBlocks$1.apply(DiskBlockManager.scala:103)
> at
> org.apache.spark.storage.DiskBlockManager$$anonfun$getAllBlocks$1.apply(DiskBlockManager.scala:103)
> at
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
> at
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
> at scala.collection.mutable.ArraySeq.foreach(ArraySeq.scala:73)
> at
> scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
> at scala.collection.AbstractTraversable.map(Traversable.scala:105)
> at
> org.apache.spark.storage.DiskBlockManager.getAllBlocks(DiskBlockManager.scala:103)
> {code}
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