Я запускаю Apache Spark 1.3.1 на Scala 2.11.2, а при работе в кластере HPC с достаточно большими данными я получаю многочисленные ошибки, подобные тем, которые находятся в нижней части моего сообщения (повторяется несколько раз за во-вторых, пока работа не будет убита за то, что она со временем). Исходя из ошибок, исполнитель пытается получить данные в случайном порядке с других узлов, но не может этого сделать.
Эта же программа отлично справляется с (a) меньшим объемом данных или (b) в режиме локального доступа, поэтому она имеет какое-то отношение к отправке данных по сети (и не запускается с очень небольшой объем данных).
Код, который выполняется примерно в это время, выглядит следующим образом:
val partitioned_data = data // data was read as sc.textFile(inputFile)
.zipWithIndex.map(x => (x._2, x._1))
.partitionBy(partitioner) // A custom partitioner
.map(_._2)
// Force previous lazy operations to be evaluated. Presumably adds some
// overhead, but hopefully the minimum possible...
// Suggested on Spark user list: http://apache-spark-user-list.1001560.n3.nabble.com/Forcing-RDD-computation-with-something-else-than-count-td707.html
sc.runJob(partitioned_data, (iter: Iterator[_]) => {})
Является ли это показателем ошибки, или есть что-то, что я делаю неправильно?
Здесь небольшой фрагмент журнала stderr одного из исполнителей (полный журнал здесь):
15/04/21 14:59:28 ERROR TransportRequestHandler: Error sending result ChunkFetchSuccess{streamChunkId=StreamChunkId{streamId=1601401593000, chunkIndex=0}, buffer=FileSegmentManagedBuffer{file=/tmp/spark-0f8d0598-b137-4d14-993a-568b2ab3709a/spark-12d5ff0a-2793-4b76-8a0b-d977a5924925/spark-7ad9382d-05cf-49d4-9a52-d42e6ca7117d/blockmgr-b72d4068-d065-47e6-8a10-867f723000db/15/shuffle_0_1_0.data, offset=26501223, length=6227612}} to /10.0.0.5:41160; closing connection
java.io.IOException: Resource temporarily unavailable
at sun.nio.ch.FileChannelImpl.transferTo0(Native Method)
at sun.nio.ch.FileChannelImpl.transferToDirectly(FileChannelImpl.java:415)
at sun.nio.ch.FileChannelImpl.transferTo(FileChannelImpl.java:516)
at org.apache.spark.network.buffer.LazyFileRegion.transferTo(LazyFileRegion.java:96)
at org.apache.spark.network.protocol.MessageWithHeader.transferTo(MessageWithHeader.java:89)
at io.netty.channel.socket.nio.NioSocketChannel.doWriteFileRegion(NioSocketChannel.java:237)
at io.netty.channel.nio.AbstractNioByteChannel.doWrite(AbstractNioByteChannel.java:233)
at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:264)
at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:707)
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.flush0(AbstractNioChannel.java:315)
at io.netty.channel.AbstractChannel$AbstractUnsafe.flush(AbstractChannel.java:676)
at io.netty.channel.DefaultChannelPipeline$HeadContext.flush(DefaultChannelPipeline.java:1059)
at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:688)
at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:669)
at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115)
at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:688)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:718)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:706)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:741)
at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:895)
at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:240)
at org.apache.spark.network.server.TransportRequestHandler.respond(TransportRequestHandler.java:147)
at org.apache.spark.network.server.TransportRequestHandler.processFetchRequest(TransportRequestHandler.java:119)
at org.apache.spark.network.server.TransportRequestHandler.handle(TransportRequestHandler.java:95)
at org.apache.spark.network.server.TransportChannelHandler.channelRead0(TransportChannelHandler.java:91)
at org.apache.spark.network.server.TransportChannelHandler.channelRead0(TransportChannelHandler.java:44)
at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:163)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:130)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
at java.lang.Thread.run(Thread.java:619)
15/04/21 14:59:28 ERROR TransportRequestHandler: Error sending result ChunkFetchSuccess{streamChunkId=StreamChunkId{streamId=1601401593000, chunkIndex=1}, buffer=FileSegmentManagedBuffer{file=/tmp/spark-0f8d0598-b137-4d14-993a-568b2ab3709a/spark-12d5ff0a-2793-4b76-8a0b-d977a5924925/spark-7ad9382d-05cf-49d4-9a52-d42e6ca7117d/blockmgr-b72d4068-d065-47e6-8a10-867f723000db/27/shuffle_0_5_0.data, offset=3792987, length=2862285}} to /10.0.0.5:41160; closing connection
java.nio.channels.ClosedChannelException
15/04/21 14:59:28 ERROR TransportRequestHandler: Error sending result ChunkFetchSuccess{streamChunkId=StreamChunkId{streamId=1601401593002, chunkIndex=0}, buffer=FileSegmentManagedBuffer{file=/tmp/spark-0f8d0598-b137-4d14-993a-568b2ab3709a/spark-12d5ff0a-2793-4b76-8a0b-d977a5924925/spark-7ad9382d-05cf-49d4-9a52-d42e6ca7117d/blockmgr-b72d4068-d065-47e6-8a10-867f723000db/15/shuffle_0_1_0.data, offset=0, length=10993212}} to /10.0.0.6:42426; closing connection
java.io.IOException: Resource temporarily unavailable
at sun.nio.ch.FileChannelImpl.transferTo0(Native Method)
at sun.nio.ch.FileChannelImpl.transferToDirectly(FileChannelImpl.java:415)
at sun.nio.ch.FileChannelImpl.transferTo(FileChannelImpl.java:516)
at org.apache.spark.network.buffer.LazyFileRegion.transferTo(LazyFileRegion.java:96)
at org.apache.spark.network.protocol.MessageWithHeader.transferTo(MessageWithHeader.java:89)
at io.netty.channel.socket.nio.NioSocketChannel.doWriteFileRegion(NioSocketChannel.java:237)
at io.netty.channel.nio.AbstractNioByteChannel.doWrite(AbstractNioByteChannel.java:233)
at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:264)
at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:707)
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.flush0(AbstractNioChannel.java:315)
at io.netty.channel.AbstractChannel$AbstractUnsafe.flush(AbstractChannel.java:676)
at io.netty.channel.DefaultChannelPipeline$HeadContext.flush(DefaultChannelPipeline.java:1059)
at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:688)
at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:669)
at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115)
at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:688)
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:718)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:706)
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:741)
at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:895)
at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:240)
at org.apache.spark.network.server.TransportRequestHandler.respond(TransportRequestHandler.java:147)
at org.apache.spark.network.server.TransportRequestHandler.processFetchRequest(TransportRequestHandler.java:119)
at org.apache.spark.network.server.TransportRequestHandler.handle(TransportRequestHandler.java:95)
at org.apache.spark.network.server.TransportChannelHandler.channelRead0(TransportChannelHandler.java:91)
at org.apache.spark.network.server.TransportChannelHandler.channelRead0(TransportChannelHandler.java:44)
at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:163)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:130)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
at java.lang.Thread.run(Thread.java:619)
15/04/21 14:59:28 WARN TransportChannelHandler: Exception in connection from node5.someuniversity.edu/10.0.0.5:60089
java.io.IOException: Connection reset by peer
at sun.nio.ch.FileDispatcher.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:21)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:233)
at sun.nio.ch.IOUtil.read(IOUtil.java:206)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:236)
at io.netty.buffer.PooledHeapByteBuf.setBytes(PooledHeapByteBuf.java:234)
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:881)
at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:225)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:119)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
at java.lang.Thread.run(Thread.java:619)
15/04/21 14:59:28 ERROR TransportResponseHandler: Still have 2 requests outstanding when connection from node5.someuniversity.edu/10.0.0.5:60089 is closed
15/04/21 14:59:28 INFO RetryingBlockFetcher: Retrying fetch (1/3) for 2 outstanding blocks after 5000 ms