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From Thomas Gerber <thomas.ger...@radius.com>
Subject Re: Error communicating with MapOutputTracker
Date Wed, 04 Mar 2015 18:24:27 GMT
Follow up:
We re-retried, this time after *decreasing* spark.parallelism. It was set
to 16000 before, (5 times the number of cores in our cluster). It is now
down to 6400 (2 times the number of cores).

And it got past the point where it failed before.

Does the MapOutputTracker have a limit on the number of tasks it can track?


On Wed, Mar 4, 2015 at 8:15 AM, Thomas Gerber <thomas.gerber@radius.com>
wrote:

> Hello,
>
> We are using spark 1.2.1 on a very large cluster (100 c3.8xlarge workers).
> We use spark-submit to start an application.
>
> We got the following error which leads to a failed stage:
>
> Job aborted due to stage failure: Task 3095 in stage 140.0 failed 4 times, most recent
failure: Lost task 3095.3 in stage 140.0 (TID 308697, ip-10-0-12-88.ec2.internal): org.apache.spark.SparkException:
Error communicating with MapOutputTracker
>
>
> We tried the whole application again, and it failed on the same stage (but
> it got more tasks completed on that stage) with the same error.
>
> We then looked at executors stderr, and all show similar logs, on both
> runs (see below). As far as we can tell, executors and master have disk
> space left.
>
> *Any suggestion on where to look to understand why the communication with
> the MapOutputTracker fails?*
>
> Thanks
> Thomas
> ====
> In case it matters, our akka settings:
> spark.akka.frameSize 50
> spark.akka.threads 8
> // those below are 10* the default, to cope with large GCs
> spark.akka.timeout 1000
> spark.akka.heartbeat.pauses 60000
> spark.akka.failure-detector.threshold 3000.0
> spark.akka.heartbeat.interval 10000
>
> Appendix: executor logs, where it starts going awry
>
> 15/03/04 11:45:00 INFO CoarseGrainedExecutorBackend: Got assigned task 298525
> 15/03/04 11:45:00 INFO Executor: Running task 3083.0 in stage 140.0 (TID 298525)
> 15/03/04 11:45:00 INFO MemoryStore: ensureFreeSpace(1473) called with curMem=5543008799,
maxMem=18127202549
> 15/03/04 11:45:00 INFO MemoryStore: Block broadcast_339_piece0 stored as bytes in memory
(estimated size 1473.0 B, free 11.7 GB)
> 15/03/04 11:45:00 INFO BlockManagerMaster: Updated info of block broadcast_339_piece0
> 15/03/04 11:45:00 INFO TorrentBroadcast: Reading broadcast variable 339 took 224 ms
> 15/03/04 11:45:00 INFO MemoryStore: ensureFreeSpace(2536) called with curMem=5543010272,
maxMem=18127202549
> 15/03/04 11:45:00 INFO MemoryStore: Block broadcast_339 stored as values in memory (estimated
size 2.5 KB, free 11.7 GB)
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Doing the fetch; tracker actor = Actor[akka.tcp://sparkDriver@ip-10-0-10-17.ec2.internal:52380/user/MapOutputTracker#-2057016370]
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:00 INFO MapOutputTrackerWorker: Don't have map outputs for shuffle 18,
fetching them
> 15/03/04 11:45:30 ERROR MapOutputTrackerWorker: Error communicating with MapOutputTracker
> java.util.concurrent.TimeoutException: Futures timed out after [30 seconds]
> 	at scala.concurrent.impl.Promise$DefaultPromise.ready(Promise.scala:219)
> 	at scala.concurrent.impl.Promise$DefaultPromise.result(Promise.scala:223)
> 	at scala.concurrent.Await$$anonfun$result$1.apply(package.scala:107)
> 	at scala.concurrent.BlockContext$DefaultBlockContext$.blockOn(BlockContext.scala:53)
> 	at scala.concurrent.Await$.result(package.scala:107)
> 	at org.apache.spark.MapOutputTracker.askTracker(MapOutputTracker.scala:112)
> 	at org.apache.spark.MapOutputTracker.getServerStatuses(MapOutputTracker.scala:163)
> 	at org.apache.spark.shuffle.hash.BlockStoreShuffleFetcher$.fetch(BlockStoreShuffleFetcher.scala:42)
> 	at org.apache.spark.shuffle.hash.HashShuffleReader.read(HashShuffleReader.scala:40)
> 	at org.apache.spark.rdd.ShuffledRDD.compute(ShuffledRDD.scala:92)
> 	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:280)
> 	at org.apache.spark.rdd.RDD.iterator(RDD.scala:247)
> 	at org.apache.spark.rdd.MappedRDD.compute(MappedRDD.scala:31)
> 	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:280)
> 	at org.apache.spark.rdd.RDD.iterator(RDD.scala:247)
> 	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:68)
> 	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)
> 	at org.apache.spark.scheduler.Task.run(Task.scala:56)
> 	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:200)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> 	at java.lang.Thread.run(Thread.java:745)
> 15/03/04 11:45:30 INFO MapOutputTrackerWorker: Doing the fetch; tracker actor = Actor[akka.tcp://sparkDriver@ip-10-0-10-17.ec2.internal:52380/user/MapOutputTracker#-2057016370]
> 15/03/04 11:45:30 ERROR Executor: Exception in task 32.0 in stage 140.0 (TID 295474)
> org.apache.spark.SparkException: Error communicating with MapOutputTracker
> 	at org.apache.spark.MapOutputTracker.askTracker(MapOutputTracker.scala:116)
> 	at org.apache.spark.MapOutputTracker.getServerStatuses(MapOutputTracker.scala:163)
> 	at org.apache.spark.shuffle.hash.BlockStoreShuffleFetcher$.fetch(BlockStoreShuffleFetcher.scala:42)
>
> ===
> and then later a lot of those:
> ===
>
> 15/03/04 11:51:50 ERROR TransportRequestHandler: Error sending result ChunkFetchSuccess{streamChunkId=StreamChunkId{streamId=29906093434,
chunkIndex=25}, buffer=FileSegmentManagedBuffer{file=/mnt/spark/spark-3f8c4cbe-a1f8-4a66-ac17-0a3d3daaffaf/spark-92cb6108-35af-4ad0-82f6-ac904b677eff/spark-8fc6043c-df95-4c48-9215-5b9907014b55/spark-99219c49-778b-4b5f-8454-24d2d3b82b81/0d/shuffle_18_6718_0.data,
offset=182070, length=166}} to /10.0.12.24:33174; closing connection
> java.nio.channels.ClosedChannelException
>
>

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