Dmitrii Bundin created SPARK-22823:
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Summary: Race Condition when reading Broadcast shuffle input
Key: SPARK-22823
URL: https://issues.apache.org/jira/browse/SPARK-22823
Project: Spark
Issue Type: Bug
Components: Block Manager
Affects Versions: 2.2.1, 2.0.1
Reporter: Dmitrii Bundin
Priority: Minor
It seems we have a race condition when trying to read shuffle input which is a
broadcast, not direct. To read broadcast MapStatuses at
{code:java}
org.apache.spark.shuffle.BlockStoreShuffleReader::read()
{code}
we submit a message of the type GetMapOutputStatuses(shuffleId) to be executed
in MapOutputTrackerMaster's pool which in turn ends up in creating a new
broadcast in
{code:java}
org.apache.spark.MapOutputTracker::serializeMapStatuses
{code}
if the receive statuses bytes more than minBroadcastSize.
So registering the newly created broadcast in the driver's
BlockManagerMasterEndpoint may appear later than some executor asks for the
broadcast piece location from the driver.
In out project we get the following exception on the regular basis:
{code:java}
java.io.IOException: org.apache.spark.SparkException: Failed to get
broadcast_176_piece0 of broadcast_176
at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1280)
at
org.apache.spark.broadcast.TorrentBroadcast.readBroadcastBlock(TorrentBroadcast.scala:174)
at
org.apache.spark.broadcast.TorrentBroadcast._value$lzycompute(TorrentBroadcast.scala:65)
at
org.apache.spark.broadcast.TorrentBroadcast._value(TorrentBroadcast.scala:65)
at
org.apache.spark.broadcast.TorrentBroadcast.getValue(TorrentBroadcast.scala:89)
at org.apache.spark.broadcast.Broadcast.value(Broadcast.scala:70)
at
org.apache.spark.MapOutputTracker$$anonfun$deserializeMapStatuses$1.apply(MapOutputTracker.scala:661)
at
org.apache.spark.MapOutputTracker$$anonfun$deserializeMapStatuses$1.apply(MapOutputTracker.scala:661)
at org.apache.spark.internal.Logging$class.logInfo(Logging.scala:54)
at
org.apache.spark.MapOutputTracker$.logInfo(MapOutputTracker.scala:598)
at
org.apache.spark.MapOutputTracker$.deserializeMapStatuses(MapOutputTracker.scala:660)
at
org.apache.spark.MapOutputTracker.getStatuses(MapOutputTracker.scala:203)
at
org.apache.spark.MapOutputTracker.getMapSizesByExecutorId(MapOutputTracker.scala:142)
at
org.apache.spark.shuffle.BlockStoreShuffleReader.read(BlockStoreShuffleReader.scala:49)
at org.apache.spark.rdd.ShuffledRDD.compute(ShuffledRDD.scala:109)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:319)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:283)
at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:70)
at org.apache.spark.scheduler.Task.run(Task.scala:86)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:274)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.spark.SparkException: Failed to get broadcast_176_piece0
of broadcast_176
at
org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1.apply$mcVI$sp(TorrentBroadcast.scala:146)
at
org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1.apply(TorrentBroadcast.scala:125)
at
org.apache.spark.broadcast.TorrentBroadcast$$anonfun$org$apache$spark$broadcast$TorrentBroadcast$$readBlocks$1.apply(TorrentBroadcast.scala:125)
at scala.collection.immutable.List.foreach(List.scala:381)
at
org.apache.spark.broadcast.TorrentBroadcast.org$apache$spark$broadcast$TorrentBroadcast$$readBlocks(TorrentBroadcast.scala:125)
at
org.apache.spark.broadcast.TorrentBroadcast$$anonfun$readBroadcastBlock$1.apply(TorrentBroadcast.scala:186)
at org.apache.spark.util.Utils$.tryOrIOException(Utils.scala:1273)
{code}
This exception is appeared when we try to read a broadcast piece. To do this we
need to fetch the broadcast piece location from the driver
{code:java}
org.apache.spark.storage.BlockManagerMaster::getLocations(blockId: BlockId)
{code}
. The driver responses with empty list of locations and the fecthing of
broadcast piece failed with the exception listed above.
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