Sometime back I was playing with Spark and Tachyon and I also found this issue . The issue here is TachyonBlockManager put the blocks in WriteType.TRY_CACHE configuration . And because of this Blocks ate evicted from Tachyon Cache when Memory is full and when Spark try to find the block it throws BlockNotFoundException .
To solve this I tried Hierarchical Storage on Tachyon ( http://tachyon -project.org/Hierarchy-Storage-on-Tachyon.html ) , and that seems to have worked and I did not see any any Spark Job failed due to BlockNotFoundException. below is my Hierarchical Storage settings which I used.. -Dtachyon.worker.hierarchystore.level.max=2 -Dtachyon.worker.hierarchystore.level0.alias=MEM -Dtachyon.worker.hierarchystore.level0.dirs.path=$TACHYON_RAM_FOLDER -Dtachyon.worker.hierarchystore.level0.dirs.quota=$TACHYON_WORKER_MEMORY_SIZE -Dtachyon.worker.hierarchystore.level1.alias=HDD -Dtachyon.worker.hierarchystore.level1.dirs.path=/mnt/tachyon -Dtachyon.worker.hierarchystore.level1.dirs.quota=50GB -Dtachyon.worker.allocate.strategy=MAX_FREE -Dtachyon.worker.evict.strategy=LRU Regards, Dibyendu On Wed, Aug 26, 2015 at 12:25 PM, Todd <bit1...@163.com> wrote: > > I am using tachyon in the spark program below,but I encounter a > BlockNotFoundxception. > Does someone know what's wrong and also is there guide on how to configure > spark to work with Tackyon?Thanks! > > conf.set("spark.externalBlockStore.url", "tachyon://10.18.19.33:19998 > ") > conf.set("spark.externalBlockStore.baseDir","/spark") > val sc = new SparkContext(conf) > import org.apache.spark.storage.StorageLevel > val rdd = sc.parallelize(List(1, 2, 3, 4, 5, 6)) > rdd.persist(StorageLevel.OFF_HEAP) > val count = rdd.count() > val sum = rdd.reduce(_ + _) > println(s"The count: $count, The sum is: $sum") > > > 15/08/26 14:52:03 INFO TaskSchedulerImpl: Removed TaskSet 0.0, whose tasks > have all completed, from pool > org.apache.spark.SparkException: Job aborted due to stage failure: Task 5 > in stage 0.0 failed 1 times, most recent failure: Lost task 5.0 in stage > 0.0 (TID 5, localhost): java.lang.RuntimeException: > org.apache.spark.storage.BlockNotFoundException: Block rdd_0_5 not found > at > org.apache.spark.storage.BlockManager.getBlockData(BlockManager.scala:308) > at > org.apache.spark.network.netty.NettyBlockRpcServer$$anonfun$2.apply(NettyBlockRpcServer.scala:57) > at > org.apache.spark.network.netty.NettyBlockRpcServer$$anonfun$2.apply(NettyBlockRpcServer.scala:57) > at > scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244) > at > scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244) > at > scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33) > at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:108) > at > scala.collection.TraversableLike$class.map(TraversableLike.scala:244) > at scala.collection.mutable.ArrayOps$ofRef.map(ArrayOps.scala:108) > at > org.apache.spark.network.netty.NettyBlockRpcServer.receive(NettyBlockRpcServer.scala:57) > at > org.apache.spark.network.server.TransportRequestHandler.processRpcRequest(TransportRequestHandler.java:114) > at > org.apache.spark.network.server.TransportRequestHandler.handle(TransportRequestHandler.java:87) > at > org.apache.spark.network.server.TransportChannelHandler.channelRead0(TransportChannelHandler.java:101) > at > org.apache.spark.network.server.TransportChannelHandler.channelRead0(TransportChannelHandler.java:51) > at > io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) > at > io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) > at > io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) > at > io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:254) > at > io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) > at > io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) > at > io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) > at > io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) > at > io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) > at > io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:163) > at > io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) > at > io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) > at > io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787) > at > io.netty.channel.nio.AbstractNioByteChannel$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) > > > > >
