Here’s a repro for PySpark:
a = sc.parallelize(["Nick", "John", "Bob"])
a = a.repartition(24000)
a.keyBy(lambda x: len(x)).reduceByKey(lambda x,y: x + y).take(1)
When I try this on an EC2 cluster with 1.1.0-rc2 and Python 2.7, this is
what I get:
>>> a = sc.parallelize(["Nick", "John", "Bob"])>>> a = a.repartition(24000)>>>
>>> a.keyBy(lambda x: len(x)).reduceByKey(lambda x,y: x + y).take(1)14/08/29
>>> 21:53:40 WARN BlockManagerMasterActor: Removing BlockManager
>>> BlockManagerId(0, ip-10-138-29-167.ec2.internal, 46252, 0) with no recent
>>> heart beats: 175143ms exceeds 45000ms14/08/29 21:53:50 WARN
>>> BlockManagerMasterActor: Removing BlockManager BlockManagerId(10,
>>> ip-10-138-18-106.ec2.internal, 33711, 0) with no recent heart beats:
>>> 175359ms exceeds 45000ms14/08/29 21:54:02 WARN BlockManagerMasterActor:
>>> Removing BlockManager BlockManagerId(19, ip-10-139-36-207.ec2.internal,
>>> 52208, 0) with no recent heart beats: 173061ms exceeds 45000ms14/08/29
>>> 21:54:13 WARN BlockManagerMasterActor: Removing BlockManager
>>> BlockManagerId(5, ip-10-73-142-70.ec2.internal, 56162, 0) with no recent
>>> heart beats: 176816ms exceeds 45000ms14/08/29 21:54:22 WARN
>>> BlockManagerMasterActor: Removing BlockManager BlockManagerId(7,
>>> ip-10-236-145-200.ec2.internal, 40959, 0) with no recent heart beats:
>>> 182241ms exceeds 45000ms14/08/29 21:54:40 WARN BlockManagerMasterActor:
>>> Removing BlockManager BlockManagerId(4, ip-10-139-1-195.ec2.internal,
>>> 49221, 0) with no recent heart beats: 178406ms exceeds 45000ms14/08/29
>>> 21:54:41 ERROR Utils: Uncaught exception in thread Result resolver thread-3
java.lang.OutOfMemoryError: Java heap space
at com.esotericsoftware.kryo.io.Input.readBytes(Input.java:296)
at
com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ByteArraySerializer.read(DefaultArraySerializers.java:35)
at
com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ByteArraySerializer.read(DefaultArraySerializers.java:18)
at com.esotericsoftware.kryo.Kryo.readObjectOrNull(Kryo.java:699)
at
com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.read(FieldSerializer.java:611)
at
com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:221)
at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:729)
at
org.apache.spark.serializer.KryoSerializerInstance.deserialize(KryoSerializer.scala:162)
at org.apache.spark.scheduler.DirectTaskResult.value(TaskResult.scala:79)
at
org.apache.spark.scheduler.TaskSetManager.handleSuccessfulTask(TaskSetManager.scala:514)
at
org.apache.spark.scheduler.TaskSchedulerImpl.handleSuccessfulTask(TaskSchedulerImpl.scala:355)
at
org.apache.spark.scheduler.TaskResultGetter$$anon$2$$anonfun$run$1.apply$mcV$sp(TaskResultGetter.scala:68)
at
org.apache.spark.scheduler.TaskResultGetter$$anon$2$$anonfun$run$1.apply(TaskResultGetter.scala:47)
at
org.apache.spark.scheduler.TaskResultGetter$$anon$2$$anonfun$run$1.apply(TaskResultGetter.scala:47)
at org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1311)
at
org.apache.spark.scheduler.TaskResultGetter$$anon$2.run(TaskResultGetter.scala:46)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Exception in thread "Result resolver thread-3" 14/08/29 21:56:26 ERROR
SendingConnection: Exception while reading SendingConnection to
ConnectionManagerId(ip-10-73-142-223.ec2.internal,54014)
java.nio.channels.ClosedChannelException
at sun.nio.ch.SocketChannelImpl.ensureReadOpen(SocketChannelImpl.java:252)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:295)
at org.apache.spark.network.SendingConnection.read(Connection.scala:390)
at
org.apache.spark.network.ConnectionManager$$anon$7.run(ConnectionManager.scala:199)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
java.lang.OutOfMemoryError: Java heap space
at com.esotericsoftware.kryo.io.Input.readBytes(Input.java:296)
at
com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ByteArraySerializer.read(DefaultArraySerializers.java:35)
at
com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ByteArraySerializer.read(DefaultArraySerializers.java:18)
at com.esotericsoftware.kryo.Kryo.readObjectOrNull(Kryo.java:699)
at
com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.read(FieldSerializer.java:611)
at
com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:221)
at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:729)
at
org.apache.spark.serializer.KryoSerializerInstance.deserialize(KryoSerializer.scala:162)
at org.apache.spark.scheduler.DirectTaskResult.value(TaskResult.scala:79)
at
org.apache.spark.scheduler.TaskSetManager.handleSuccessfulTask(TaskSetManager.scala:514)
at
org.apache.spark.scheduler.TaskSchedulerImpl.handleSuccessfulTask(TaskSchedulerImpl.scala:355)
at
org.apache.spark.scheduler.TaskResultGetter$$anon$2$$anonfun$run$1.apply$mcV$sp(TaskResultGetter.scala:68)
at
org.apache.spark.scheduler.TaskResultGetter$$anon$2$$anonfun$run$1.apply(TaskResultGetter.scala:47)
at
org.apache.spark.scheduler.TaskResultGetter$$anon$2$$anonfun$run$1.apply(TaskResultGetter.scala:47)
at org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1311)
at
org.apache.spark.scheduler.TaskResultGetter$$anon$2.run(TaskResultGetter.scala:46)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)14/08/29 21:54:43 WARN
BlockManagerMasterActor: Removing BlockManager BlockManagerId(6,
ip-10-137-1-139.ec2.internal, 42539, 0) with no recent heart beats:
183978ms exceeds 45000ms14/08/29 21:57:42 ERROR ConnectionManager:
Corresponding SendingConnection to
ConnectionManagerId(ip-10-138-9-33.ec2.internal,41924) not
found14/08/29 21:57:51 WARN BlockManagerMasterActor: Removing
BlockManager BlockManagerId(11, ip-10-236-181-116.ec2.internal, 46847,
0) with no recent heart beats: 178629ms exceeds 45000ms14/08/29
21:57:43 ERROR ConnectionManager: Corresponding SendingConnection to
ConnectionManagerId(ip-10-137-1-139.ec2.internal,42539) not
found14/08/29 21:57:54 ERROR SendingConnection: Exception while
reading SendingConnection to
ConnectionManagerId(ip-10-141-136-168.ec2.internal,42960)
java.nio.channels.ClosedChannelException
at sun.nio.ch.SocketChannelImpl.ensureReadOpen(SocketChannelImpl.java:252)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:295)
at org.apache.spark.network.SendingConnection.read(Connection.scala:390)
at
org.apache.spark.network.ConnectionManager$$anon$7.run(ConnectionManager.scala:199)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Is this a bug? What’s going on here?
Nick
--
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