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java.lang.OutOfMemoryError: Java heap space	at java.util.IdentityHashMap.resize(IdentityHashMap.java:469)	at java.util.IdentityHashMap.put(IdentityHashMap.java:445)	at org.apache.spark.util.SizeEstimator$SearchState.enqueue(SizeEstimator.scala:159)	at org.apache.spark.util.SizeEstimator$.visitArray(SizeEstimator.scala:229)	at org.apache.spark.util.SizeEstimator$.visitSingleObject(SizeEstimator.scala:194)	at org.apache.spark.util.SizeEstimator$.org$apache$spark$util$SizeEstimator$$estimate(SizeEstimator.scala:186)	at org.apache.spark.util.SizeEstimator$.estimate(SizeEstimator.scala:54)	at org.apache.spark.util.collection.SizeTracker$class.takeSample(SizeTracker.scala:78)	at org.apache.spark.util.collection.SizeTracker$class.afterUpdate(SizeTracker.scala:70)	at org.apache.spark.util.collection.SizeTrackingVector.$plus$eq(SizeTrackingVector.scala:31)	at org.apache.spark.storage.MemoryStore.unrollSafely(MemoryStore.scala:278)	at org.apache.spark.storage.MemoryStore.putIterator(MemoryStore.scala:165)	at org.apache.spark.storage.MemoryStore.putIterator(MemoryStore.scala:143)	at org.apache.spark.storage.BlockManager.doPut(BlockManager.scala:801)	at org.apache.spark.storage.BlockManager.putIterator(BlockManager.scala:648)	at org.apache.spark.storage.BlockManager.putSingle(BlockManager.scala:1006)	at org.apache.spark.broadcast.TorrentBroadcast.writeBlocks(TorrentBroadcast.scala:99)	at org.apache.spark.broadcast.TorrentBroadcast.(TorrentBroadcast.scala:85)	at org.apache.spark.broadcast.TorrentBroadcastFactory.newBroadcast(TorrentBroadcastFactory.scala:34)	at org.apache.spark.broadcast.BroadcastManager.newBroadcast(BroadcastManager.scala:63)	at org.apache.spark.SparkContext.broadcast(SparkContext.scala:1327)