第三课_Spark内部原理剖析与源码阅读

第三课_Spark内部原理剖析与源码阅读的相关问题都在下面进行提问回帖
1、大家在这个帖子上回复自己想要提的问题。（相同的问题，请点赞表示自己关注这个问题，不用重复提问）
2、提出的问题，老师在直播课的最后30分钟统一回答。
3、课后会整理出参考答案，给每个问题回帖。
第三课课后调查问卷：
https://wj.qq.com/s/1271712/e86d
或者扫二维码进行填写
333333312.jpg

 
2017-04-12 添加评论
分享

MichaelFly

赞同来自: zstorm 、baoshan 、liuzhixin137

日志格式：日志产生时间，appid，........ flume采集日志落地到hdfs会有延迟，如何保证数据临界点的数据落地到对应分区？ 比如：2017-04-12 23:59:59     appid ，发送到hdfs时已经是 2017-04-13 00:00:01 ，本来数据是20170412的数据但是落地到了20170413，这种问题通过flume如何解决？ 谢谢老师了
2017-04-13 3 0
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run_psw

赞同来自: Angel儱唲 、贰怪兽lyn

董老师，我再补充两个问题   1、关于源码阅读的，一个新手，在刚刚接触到一个新框架，比如说spark，我该如何来阅读spark的源码呢？   2、关于spark GC的问题。spark 的GC 最频繁的环节应该是executor执行task。请问这个时候，是否是执行完一个task就gc一次还是怎么样？能够请老师讲以spark 程序运行为案例，讲解一下spark   GC 过程和情况    3、能否简单的介绍下spark 的 tunsgen project 。在什么问题背景下诞生的，现在的情况，将来的方向。
2017-04-13 2 0
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run_psw

赞同来自: 雨果等夏天

老师您好！问您三个问题   1、spark在submit任务的时候，如何考虑--executor-cores    --nums-executor   --executor-memory 这几个参数。特别是在海量数据的情况下。这里先考虑代码调优的情况，就比如说是个简单但数据量很大很大的etl 作业。   2、task 的个数和stage中的那个RDD 的partition 相等？map 操作应该stage中每个rdd 的paritio是一样的。filter 这种操作呢？   3、希望老师分享一些代码调优结合这种资源分配的经验。知道这是下一节课会讲的类容，但是因为调优经验可能不是一问，老师立马就能够完整的把自己经验分享出来，所以提前问一下。希望引起老师的重视。其实关于调优的方法，很多人都知道，但是实际操作起来的时候，还是没那么容易的。别是那些参数之间的关系?        
2017-04-13 1 0
分享

呼噜噜

赞同来自: heming621

为什么说shuffle中间结果要写磁盘？spark内存不是分为执行内存和存储内存，执行内存不存中间结果吗？还有off-heap怎样理解？
2017-04-13 1 0
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jhg22

赞同来自:

yarn上提交spark，一直都是accepted状态,运行一段时间 后变为fail状态。如下图
2.png
  提交shell脚本：
3.png
，感觉没有什么问题呀    
2017-04-12 0 1
分享

MichaelFly

赞同来自:

如何解决flume内存chanel数据丢失处理问题
2017-04-13 0 0
分享

掂吾掂

赞同来自:

spark-sbumit目前有三种方式：mesos  yarn   standalone。各自优缺点是什么？目前见到网上有许多人是推荐yarn方式，仅仅是因为yarn方式不需要搭建spark集群？还是因为yarn集群的目前资源调度的性能是目前最优？  
2017-04-13 0 1
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zstorm - 80后IT男

赞同来自:

老师您好 1.用hive语句(tez引擎)处理hbase数据的时候，效率很高,但是因为hbase字段太多,处理很困难。使用mapreduce程序处理hbase数据的时候，逻辑是清楚了，但是效率特别低，Hbase的Filter也无法带来性能提升。 问题：使用spark处理hbase数据（数据量好几个T，字段几百个）的时候效率如何，加入Hbase的Filter能否有性能提升？ 2.在演练spark2.1课件的时候发现api与课件中的不一样,课件中应该是1.x的,希望老师能将课件升级一下
val sparkConf = new SparkConf().setMaster("local").setAppName("SparkPi")
val sc = new SparkContext(sparkConf)
val numSlices = 3
val n = 1000000000
val counter0 = sc.longAccumulator("counter0")
val counter1 = sc.longAccumulator("counter1")
val counter2 = sc.longAccumulator("counter2")
sc.parallelize(1 to n, numSlices)
  .map { i =>
    counter0.add(1)
    val x = Math.random() * 2 - 1
    val y = Math.random() * 2 - 1
    val dist = x * x + y * y
    if (dist < 1) {
      counter1.add(1)
    } else {
      counter2.add(1)
    }
    if (dist < 1) 1 else 0
  }.reduce(_ + _)
2017-04-13 0 0
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王云鹏

赞同来自:

老师您好，请教一个Spark开发的问题。 我们想用spark实现数据分组求20日均的场景。 数据源提取的 RDD包含 用户、日期、当天交易额等相关字段。想给每个用户每天计算出前20天均线，类似Oracle中的Over partition by。这样每一条记录都都需要用到该用户前10天的交易量信息，在目前的transformer、action中都没有合适的方法。请老师给个实现的思路。谢谢
2017-04-13 0 0
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run_psw

赞同来自:

董老师，您好！我再问个问题   从数据的角度，宏观的来看shuffle，是不是可以这么理解，RDD中的每个partition里面的数据，都发生的从一个partition到另一个partition的移动或者说转化呢？
2017-04-13 0 0
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fanniao - 青山不改，绿水长流

赞同来自:

请教下2个问题： 1、spark在运行任务时，如运行多个任务，怎么控制每个任务占用多少内存、CPU资源？ 2、on yarn 和 alone，的控制资源方式，配置一样吗？ 谢谢。
2017-04-13 0 1
分享

tl_oni

赞同来自: 

 
windows开发环境中：
var masterUrl-1 = "local[1]"
var masterUrl-2="spark://server01:7077"
masterUrl-1 本地运行没问题，
如何用masterUrl-2联接远程的spark？？？
2017-04-13 0 1
分享

jhg22

赞同来自:

spark中什么情况下用Kryo序列化？  
2017-04-13 0 0
分享

逍遥feng

赞同来自:

请问下spark on yarn 报如下异常  什么原因呢？  17/04/11 15:39:05 WARN scheduler.TaskSetManager: Lost task 20.3 in stage 11.0 (TID 2011, slave4): ExecutorLostFailure (executor 11 exited caused by one of the running tasks) Reason: Container killed by YARN for exceeding memory limits. 9.0 GB of 9 GB physical memory used. Consider boosting spark.yarn.executor.memoryOverhead. 17/04/11 15:39:05 ERROR scheduler.TaskSetManager: Task 20 in stage 11.0 failed 4 times; aborting job     一般spark异常解决思路是怎么样呢  
2017-04-13 0 1
分享

苗苗树

赞同来自:

spark-submit 启动应用时，num-executors 和 executor-cores  num-executors=100 executor-cores=1 num-executors=50 executor-cores=2 executors-total 是一样的，有啥区别？
2017-04-13 0 0
分享

justdoeat

赞同来自:

shuffle read会从map拉去的数据的会写磁盘吗？ 然后再来一个全局排序的时候？数据会全部加载到内存吗？
2017-04-13 0 0
分享

陆仲达

赞同来自:

不同的应用，我怎么确定CPU的消耗和内存的消耗，总体分配多少，从而分配executor的数目以及每个executor的cpu和内存？
2017-04-13 0 0
分享

呼噜噜

赞同来自:

老师，executor中一个core就是一个线程？一个task就需要一个线程处理？是这样对应的关系吗
2017-04-13 0 1
分享

xmlnet

赞同来自:

老师您好，  我有一个List，里面存的是文件列表，为了并行处理这些文件，所以把文件的处理方法写到了list.map里，因为要做读取和写出操作，需要用到sparkSession,比如list.map(f=>function(sparkSession, f)),可是在map里用sparkSession会出错， 说不能序列化，请问老师有什么建议？
2017-04-13 0 2
分享

肯草

赞同来自:

老师想问一下shuffle read/write 使用的计算内存还是数据内存，也就是使用的是监控界面里面executor页面的内存吗？
2017-04-13 0 1
分享

tsyx163

赞同来自: 

董老师，您好，

我通过 ./spark-shell --master yarn启动了spark 。

val userrdd = sc.textFile("/opt/data/movie/users.dat")
当运行 userrdd.count 时出现以下错误，请问是怎么回事呢？

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/hadoop-2.5.1/nm-local-dir/usercache/root/filecache/28/__spark_libs__2285737196423591043.zip/slf4j-log4j12-1.7.16.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/software/hadoop-2.5.1/share/hadoop/common/lib/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
17/04/16 18:54:54 INFO executor.CoarseGrainedExecutorBackend: Started daemon with process name: 24407@master
17/04/16 18:54:54 INFO util.SignalUtils: Registered signal handler for TERM
17/04/16 18:54:54 INFO util.SignalUtils: Registered signal handler for HUP
17/04/16 18:54:54 INFO util.SignalUtils: Registered signal handler for INT
17/04/16 18:54:55 INFO spark.SecurityManager: Changing view acls to: root
17/04/16 18:54:55 INFO spark.SecurityManager: Changing modify acls to: root
17/04/16 18:54:55 INFO spark.SecurityManager: Changing view acls groups to: 
17/04/16 18:54:55 INFO spark.SecurityManager: Changing modify acls groups to: 
17/04/16 18:54:55 INFO spark.SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users  with view permissions: Set(root); groups with view permissions: Set(); users  with modify permissions: Set(root); groups with modify permissions: Set()
17/04/16 18:54:56 INFO client.TransportClientFactory: Successfully created connection to /10.135.111.231:48282 after 104 ms (0 ms spent in bootstraps)
17/04/16 18:54:56 INFO spark.SecurityManager: Changing view acls to: root
17/04/16 18:54:56 INFO spark.SecurityManager: Changing modify acls to: root
17/04/16 18:54:56 INFO spark.SecurityManager: Changing view acls groups to: 
17/04/16 18:54:56 INFO spark.SecurityManager: Changing modify acls groups to: 
17/04/16 18:54:56 INFO spark.SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users  with view permissions: Set(root); groups with view permissions: Set(); users  with modify permissions: Set(root); groups with modify permissions: Set()
17/04/16 18:54:56 INFO client.TransportClientFactory: Successfully created connection to /10.135.111.231:48282 after 2 ms (0 ms spent in bootstraps)
17/04/16 18:54:56 INFO storage.DiskBlockManager: Created local directory at /opt/hadoop-2.5.1/nm-local-dir/usercache/root/appcache/application_1492328023585_0010/blockmgr-55d5a33c-e918-4dd8-af78-38c7d035c60b
17/04/16 18:54:56 INFO memory.MemoryStore: MemoryStore started with capacity 413.9 MB
17/04/16 18:54:57 INFO executor.CoarseGrainedExecutorBackend: Connecting to driver: spark://CoarseGrainedScheduler@10.135.111.231:48282
17/04/16 18:54:57 INFO executor.CoarseGrainedExecutorBackend: Successfully registered with driver
17/04/16 18:54:57 INFO executor.Executor: Starting executor ID 1 on host master
17/04/16 18:54:57 INFO util.Utils: Successfully started service 'org.apache.spark.network.netty.NettyBlockTransferService' on port 43664.
17/04/16 18:54:57 INFO netty.NettyBlockTransferService: Server created on master:43664
17/04/16 18:54:57 INFO storage.BlockManager: Using org.apache.spark.storage.RandomBlockReplicationPolicy for block replication policy
17/04/16 18:54:57 INFO storage.BlockManagerMaster: Registering BlockManager BlockManagerId(1, master, 43664, None)
17/04/16 18:54:57 INFO storage.BlockManagerMaster: Registered BlockManager BlockManagerId(1, master, 43664, None)
17/04/16 18:54:57 INFO storage.BlockManager: Initialized BlockManager: BlockManagerId(1, master, 43664, None)
17/04/16 18:54:57 INFO executor.Executor: Using REPL class URI: spark://10.135.111.231:48282/classes
17/04/16 18:56:57 INFO executor.CoarseGrainedExecutorBackend: Got assigned task 0
17/04/16 18:56:57 INFO executor.Executor: Running task 0.0 in stage 0.0 (TID 0)
17/04/16 18:56:58 INFO broadcast.TorrentBroadcast: Started reading broadcast variable 1
17/04/16 18:56:58 INFO client.TransportClientFactory: Successfully created connection to /10.135.111.231:35165 after 2 ms (0 ms spent in bootstraps)
17/04/16 18:56:58 INFO memory.MemoryStore: Block broadcast_1_piece0 stored as bytes in memory (estimated size 1889.0 B, free 413.9 MB)
17/04/16 18:56:58 INFO broadcast.TorrentBroadcast: Reading broadcast variable 1 took 179 ms
17/04/16 18:56:58 INFO memory.MemoryStore: Block broadcast_1 stored as values in memory (estimated size 3.1 KB, free 413.9 MB)
17/04/16 18:56:58 INFO rdd.HadoopRDD: Input split: hdfs://master:9000/opt/data/movie/users.dat:0+67184
17/04/16 18:56:58 INFO broadcast.TorrentBroadcast: Started reading broadcast variable 0
17/04/16 18:56:58 INFO memory.MemoryStore: Block broadcast_0_piece0 stored as bytes in memory (estimated size 23.4 KB, free 413.9 MB)
17/04/16 18:56:58 INFO broadcast.TorrentBroadcast: Reading broadcast variable 0 took 11 ms
17/04/16 18:56:58 INFO memory.MemoryStore: Block broadcast_0 stored as values in memory (estimated size 296.9 KB, free 413.6 MB)
17/04/16 18:56:59 INFO Configuration.deprecation: mapred.tip.id is deprecated. Instead, use mapreduce.task.id
17/04/16 18:56:59 INFO Configuration.deprecation: mapred.task.id is deprecated. Instead, use mapreduce.task.attempt.id
17/04/16 18:56:59 INFO Configuration.deprecation: mapred.task.is.map is deprecated. Instead, use mapreduce.task.ismap
17/04/16 18:56:59 INFO Configuration.deprecation: mapred.task.partition is deprecated. Instead, use mapreduce.task.partition
17/04/16 18:56:59 INFO Configuration.deprecation: mapred.job.id is deprecated. Instead, use mapreduce.job.id
17/04/16 18:56:59 ERROR executor.Executor: Exception in task 0.0 in stage 0.0 (TID 0)
java.lang.UnsatisfiedLinkError: org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(IILjava/nio/ByteBuffer;ILjava/nio/ByteBuffer;IILjava/lang/String;JZ)V
	at org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(Native Method)
	at org.apache.hadoop.util.NativeCrc32.verifyChunkedSums(NativeCrc32.java:59)
	at org.apache.hadoop.util.DataChecksum.verifyChunkedSums(DataChecksum.java:301)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.readNextPacket(RemoteBlockReader2.java:231)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.read(RemoteBlockReader2.java:152)
	at org.apache.hadoop.hdfs.DFSInputStream$ByteArrayStrategy.doRead(DFSInputStream.java:775)
	at org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:831)
	at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:891)
	at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:934)
	at java.io.DataInputStream.read(DataInputStream.java:149)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.fillBuffer(UncompressedSplitLineReader.java:62)
	at org.apache.hadoop.util.LineReader.readDefaultLine(LineReader.java:216)
	at org.apache.hadoop.util.LineReader.readLine(LineReader.java:174)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.readLine(UncompressedSplitLineReader.java:94)
	at org.apache.hadoop.mapred.LineRecordReader.skipUtfByteOrderMark(LineRecordReader.java:208)
	at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:246)
	at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:48)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.getNext(HadoopRDD.scala:266)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.getNext(HadoopRDD.scala:211)
	at org.apache.spark.util.NextIterator.hasNext(NextIterator.scala:73)
	at org.apache.spark.InterruptibleIterator.hasNext(InterruptibleIterator.scala:39)
	at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
	at org.apache.spark.util.Utils$.getIteratorSize(Utils.scala:1760)
	at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1157)
	at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1157)
	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1944)
	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1944)
	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
	at org.apache.spark.scheduler.Task.run(Task.scala:99)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
	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)
17/04/16 18:57:00 INFO executor.CoarseGrainedExecutorBackend: Got assigned task 1
17/04/16 18:57:00 INFO executor.Executor: Running task 1.0 in stage 0.0 (TID 1)
17/04/16 18:57:00 INFO rdd.HadoopRDD: Input split: hdfs://master:9000/opt/data/movie/users.dat:67184+67184
17/04/16 18:57:00 ERROR executor.Executor: Exception in task 1.0 in stage 0.0 (TID 1)
java.lang.UnsatisfiedLinkError: org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(IILjava/nio/ByteBuffer;ILjava/nio/ByteBuffer;IILjava/lang/String;JZ)V
	at org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(Native Method)
	at org.apache.hadoop.util.NativeCrc32.verifyChunkedSums(NativeCrc32.java:59)
	at org.apache.hadoop.util.DataChecksum.verifyChunkedSums(DataChecksum.java:301)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.readNextPacket(RemoteBlockReader2.java:231)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.read(RemoteBlockReader2.java:152)
	at org.apache.hadoop.hdfs.DFSInputStream$ByteArrayStrategy.doRead(DFSInputStream.java:775)
	at org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:831)
	at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:891)
	at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:934)
	at java.io.DataInputStream.read(DataInputStream.java:149)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.fillBuffer(UncompressedSplitLineReader.java:62)
	at org.apache.hadoop.util.LineReader.readDefaultLine(LineReader.java:216)
	at org.apache.hadoop.util.LineReader.readLine(LineReader.java:174)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.readLine(UncompressedSplitLineReader.java:94)
	at org.apache.hadoop.mapred.LineRecordReader.<init>(LineRecordReader.java:136)
	at org.apache.hadoop.mapred.TextInputFormat.getRecordReader(TextInputFormat.java:67)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.liftedTree1$1(HadoopRDD.scala:252)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.<init>(HadoopRDD.scala:251)
	at org.apache.spark.rdd.HadoopRDD.compute(HadoopRDD.scala:211)
	at org.apache.spark.rdd.HadoopRDD.compute(HadoopRDD.scala:102)
	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
	at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
	at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
	at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
	at org.apache.spark.scheduler.Task.run(Task.scala:99)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
	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)
17/04/16 18:57:00 INFO executor.CoarseGrainedExecutorBackend: Got assigned task 2
17/04/16 18:57:00 INFO executor.Executor: Running task 0.1 in stage 0.0 (TID 2)
17/04/16 18:57:00 INFO rdd.HadoopRDD: Input split: hdfs://master:9000/opt/data/movie/users.dat:0+67184
17/04/16 18:57:00 ERROR executor.Executor: Exception in task 0.1 in stage 0.0 (TID 2)
java.lang.UnsatisfiedLinkError: org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(IILjava/nio/ByteBuffer;ILjava/nio/ByteBuffer;IILjava/lang/String;JZ)V
	at org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(Native Method)
	at org.apache.hadoop.util.NativeCrc32.verifyChunkedSums(NativeCrc32.java:59)
	at org.apache.hadoop.util.DataChecksum.verifyChunkedSums(DataChecksum.java:301)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.readNextPacket(RemoteBlockReader2.java:231)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.read(RemoteBlockReader2.java:152)
	at org.apache.hadoop.hdfs.DFSInputStream$ByteArrayStrategy.doRead(DFSInputStream.java:775)
	at org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:831)
	at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:891)
	at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:934)
	at java.io.DataInputStream.read(DataInputStream.java:149)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.fillBuffer(UncompressedSplitLineReader.java:62)
	at org.apache.hadoop.util.LineReader.readDefaultLine(LineReader.java:216)
	at org.apache.hadoop.util.LineReader.readLine(LineReader.java:174)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.readLine(UncompressedSplitLineReader.java:94)
	at org.apache.hadoop.mapred.LineRecordReader.skipUtfByteOrderMark(LineRecordReader.java:208)
	at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:246)
	at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:48)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.getNext(HadoopRDD.scala:266)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.getNext(HadoopRDD.scala:211)
	at org.apache.spark.util.NextIterator.hasNext(NextIterator.scala:73)
	at org.apache.spark.InterruptibleIterator.hasNext(InterruptibleIterator.scala:39)
	at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
	at org.apache.spark.util.Utils$.getIteratorSize(Utils.scala:1760)
	at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1157)
	at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1157)
	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1944)
	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1944)
	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
	at org.apache.spark.scheduler.Task.run(Task.scala:99)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
17/04/16 18:57:00 INFO executor.CoarseGrainedExecutorBackend: Got assigned task 3
17/04/16 18:57:00 INFO executor.Executor: Running task 1.1 in stage 0.0 (TID 3)
17/04/16 18:57:00 INFO rdd.HadoopRDD: Input split: hdfs://master:9000/opt/data/movie/users.dat:67184+67184
17/04/16 18:57:00 ERROR executor.Executor: Exception in task 1.1 in stage 0.0 (TID 3)
java.lang.UnsatisfiedLinkError: org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(IILjava/nio/ByteBuffer;ILjava/nio/ByteBuffer;IILjava/lang/String;JZ)V
	at org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(Native Method)
	at org.apache.hadoop.util.NativeCrc32.verifyChunkedSums(NativeCrc32.java:59)
	at org.apache.hadoop.util.DataChecksum.verifyChunkedSums(DataChecksum.java:301)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.readNextPacket(RemoteBlockReader2.java:231)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.read(RemoteBlockReader2.java:152)
	at org.apache.hadoop.hdfs.DFSInputStream$ByteArrayStrategy.doRead(DFSInputStream.java:775)
	at org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:831)
	at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:891)
	at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:934)
	at java.io.DataInputStream.read(DataInputStream.java:149)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.fillBuffer(UncompressedSplitLineReader.java:62)
	at org.apache.hadoop.util.LineReader.readDefaultLine(LineReader.java:216)
	at org.apache.hadoop.util.LineReader.readLine(LineReader.java:174)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.readLine(UncompressedSplitLineReader.java:94)
	at org.apache.hadoop.mapred.LineRecordReader.<init>(LineRecordReader.java:136)
	at org.apache.hadoop.mapred.TextInputFormat.getRecordReader(TextInputFormat.java:67)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.liftedTree1$1(HadoopRDD.scala:252)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.<init>(HadoopRDD.scala:251)
	at org.apache.spark.rdd.HadoopRDD.compute(HadoopRDD.scala:211)
	at org.apache.spark.rdd.HadoopRDD.compute(HadoopRDD.scala:102)
	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
	at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
	at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
	at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
	at org.apache.spark.scheduler.Task.run(Task.scala:99)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
17/04/16 18:57:00 INFO executor.CoarseGrainedExecutorBackend: Got assigned task 4
17/04/16 18:57:00 INFO executor.Executor: Running task 0.2 in stage 0.0 (TID 4)
17/04/16 18:57:00 INFO rdd.HadoopRDD: Input split: hdfs://master:9000/opt/data/movie/users.dat:0+67184
17/04/16 18:57:00 ERROR executor.Executor: Exception in task 0.2 in stage 0.0 (TID 4)
java.lang.UnsatisfiedLinkError: org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(IILjava/nio/ByteBuffer;ILjava/nio/ByteBuffer;IILjava/lang/String;JZ)V
	at org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(Native Method)
	at org.apache.hadoop.util.NativeCrc32.verifyChunkedSums(NativeCrc32.java:59)
	at org.apache.hadoop.util.DataChecksum.verifyChunkedSums(DataChecksum.java:301)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.readNextPacket(RemoteBlockReader2.java:231)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.read(RemoteBlockReader2.java:152)
	at org.apache.hadoop.hdfs.DFSInputStream$ByteArrayStrategy.doRead(DFSInputStream.java:775)
	at org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:831)
	at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:891)
	at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:934)
	at java.io.DataInputStream.read(DataInputStream.java:149)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.fillBuffer(UncompressedSplitLineReader.java:62)
	at org.apache.hadoop.util.LineReader.readDefaultLine(LineReader.java:216)
	at org.apache.hadoop.util.LineReader.readLine(LineReader.java:174)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.readLine(UncompressedSplitLineReader.java:94)
	at org.apache.hadoop.mapred.LineRecordReader.skipUtfByteOrderMark(LineRecordReader.java:208)
	at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:246)
	at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:48)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.getNext(HadoopRDD.scala:266)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.getNext(HadoopRDD.scala:211)
	at org.apache.spark.util.NextIterator.hasNext(NextIterator.scala:73)
	at org.apache.spark.InterruptibleIterator.hasNext(InterruptibleIterator.scala:39)
	at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
	at org.apache.spark.util.Utils$.getIteratorSize(Utils.scala:1760)
	at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1157)
	at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1157)
	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1944)
	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1944)
	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
	at org.apache.spark.scheduler.Task.run(Task.scala:99)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
	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)
17/04/16 18:57:00 INFO executor.CoarseGrainedExecutorBackend: Got assigned task 5
17/04/16 18:57:00 INFO executor.Executor: Running task 1.2 in stage 0.0 (TID 5)
17/04/16 18:57:00 INFO rdd.HadoopRDD: Input split: hdfs://master:9000/opt/data/movie/users.dat:67184+67184
17/04/16 18:57:00 ERROR executor.Executor: Exception in task 1.2 in stage 0.0 (TID 5)
java.lang.UnsatisfiedLinkError: org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(IILjava/nio/ByteBuffer;ILjava/nio/ByteBuffer;IILjava/lang/String;JZ)V
	at org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(Native Method)
	at org.apache.hadoop.util.NativeCrc32.verifyChunkedSums(NativeCrc32.java:59)
	at org.apache.hadoop.util.DataChecksum.verifyChunkedSums(DataChecksum.java:301)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.readNextPacket(RemoteBlockReader2.java:231)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.read(RemoteBlockReader2.java:152)
	at org.apache.hadoop.hdfs.DFSInputStream$ByteArrayStrategy.doRead(DFSInputStream.java:775)
	at org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:831)
	at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:891)
	at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:934)
	at java.io.DataInputStream.read(DataInputStream.java:149)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.fillBuffer(UncompressedSplitLineReader.java:62)
	at org.apache.hadoop.util.LineReader.readDefaultLine(LineReader.java:216)
	at org.apache.hadoop.util.LineReader.readLine(LineReader.java:174)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.readLine(UncompressedSplitLineReader.java:94)
	at org.apache.hadoop.mapred.LineRecordReader.<init>(LineRecordReader.java:136)
	at org.apache.hadoop.mapred.TextInputFormat.getRecordReader(TextInputFormat.java:67)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.liftedTree1$1(HadoopRDD.scala:252)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.<init>(HadoopRDD.scala:251)
	at org.apache.spark.rdd.HadoopRDD.compute(HadoopRDD.scala:211)
	at org.apache.spark.rdd.HadoopRDD.compute(HadoopRDD.scala:102)
	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
	at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
	at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
	at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
	at org.apache.spark.scheduler.Task.run(Task.scala:99)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
	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)
17/04/16 18:57:00 INFO executor.CoarseGrainedExecutorBackend: Got assigned task 6
17/04/16 18:57:00 INFO executor.Executor: Running task 0.3 in stage 0.0 (TID 6)
17/04/16 18:57:00 INFO rdd.HadoopRDD: Input split: hdfs://master:9000/opt/data/movie/users.dat:0+67184
17/04/16 18:57:00 ERROR executor.Executor: Exception in task 0.3 in stage 0.0 (TID 6)
java.lang.UnsatisfiedLinkError: org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(IILjava/nio/ByteBuffer;ILjava/nio/ByteBuffer;IILjava/lang/String;JZ)V
	at org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(Native Method)
	at org.apache.hadoop.util.NativeCrc32.verifyChunkedSums(NativeCrc32.java:59)
	at org.apache.hadoop.util.DataChecksum.verifyChunkedSums(DataChecksum.java:301)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.readNextPacket(RemoteBlockReader2.java:231)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.read(RemoteBlockReader2.java:152)
	at org.apache.hadoop.hdfs.DFSInputStream$ByteArrayStrategy.doRead(DFSInputStream.java:775)
	at org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:831)
	at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:891)
	at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:934)
	at java.io.DataInputStream.read(DataInputStream.java:149)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.fillBuffer(UncompressedSplitLineReader.java:62)
	at org.apache.hadoop.util.LineReader.readDefaultLine(LineReader.java:216)
	at org.apache.hadoop.util.LineReader.readLine(LineReader.java:174)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.readLine(UncompressedSplitLineReader.java:94)
	at org.apache.hadoop.mapred.LineRecordReader.skipUtfByteOrderMark(LineRecordReader.java:208)
	at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:246)
	at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:48)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.getNext(HadoopRDD.scala:266)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.getNext(HadoopRDD.scala:211)
	at org.apache.spark.util.NextIterator.hasNext(NextIterator.scala:73)
	at org.apache.spark.InterruptibleIterator.hasNext(InterruptibleIterator.scala:39)
	at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
	at org.apache.spark.util.Utils$.getIteratorSize(Utils.scala:1760)
	at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1157)
	at org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:1157)
	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1944)
	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1944)
	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
	at org.apache.spark.scheduler.Task.run(Task.scala:99)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
17/04/16 18:57:00 INFO executor.CoarseGrainedExecutorBackend: Got assigned task 7
17/04/16 18:57:00 INFO executor.Executor: Running task 1.3 in stage 0.0 (TID 7)
17/04/16 18:57:00 INFO rdd.HadoopRDD: Input split: hdfs://master:9000/opt/data/movie/users.dat:67184+67184
17/04/16 18:57:00 INFO executor.Executor: Executor is trying to kill task 1.3 in stage 0.0 (TID 7)
17/04/16 18:57:00 ERROR executor.Executor: Exception in task 1.3 in stage 0.0 (TID 7)
java.lang.UnsatisfiedLinkError: org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(IILjava/nio/ByteBuffer;ILjava/nio/ByteBuffer;IILjava/lang/String;JZ)V
	at org.apache.hadoop.util.NativeCrc32.nativeComputeChunkedSums(Native Method)
	at org.apache.hadoop.util.NativeCrc32.verifyChunkedSums(NativeCrc32.java:59)
	at org.apache.hadoop.util.DataChecksum.verifyChunkedSums(DataChecksum.java:301)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.readNextPacket(RemoteBlockReader2.java:231)
	at org.apache.hadoop.hdfs.RemoteBlockReader2.read(RemoteBlockReader2.java:152)
	at org.apache.hadoop.hdfs.DFSInputStream$ByteArrayStrategy.doRead(DFSInputStream.java:775)
	at org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:831)
	at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:891)
	at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:934)
	at java.io.DataInputStream.read(DataInputStream.java:149)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.fillBuffer(UncompressedSplitLineReader.java:62)
	at org.apache.hadoop.util.LineReader.readDefaultLine(LineReader.java:216)
	at org.apache.hadoop.util.LineReader.readLine(LineReader.java:174)
	at org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.readLine(UncompressedSplitLineReader.java:94)
	at org.apache.hadoop.mapred.LineRecordReader.<init>(LineRecordReader.java:136)
	at org.apache.hadoop.mapred.TextInputFormat.getRecordReader(TextInputFormat.java:67)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.liftedTree1$1(HadoopRDD.scala:252)
	at org.apache.spark.rdd.HadoopRDD$$anon$1.<init>(HadoopRDD.scala:251)
	at org.apache.spark.rdd.HadoopRDD.compute(HadoopRDD.scala:211)
	at org.apache.spark.rdd.HadoopRDD.compute(HadoopRDD.scala:102)
	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
	at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
	at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
	at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
	at org.apache.spark.scheduler.Task.run(Task.scala:99)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
	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)
2017-04-16 0 1
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tsyx163

赞同来自:

以上时log中的信息
2017-04-16 0 0
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贰怪兽lyn

赞同来自:

请老师进一步阐述一下Sorted shuffle为什么比优化合并中间文件后的Hash-based shuffle性能更好？谢谢。 我的理解： 假设一个shuffle有1000个map任务和1000个reduce任务， Shuffle write阶段： 优化合并中间文件后的Hash-based shuffle中，map端一个core会生成reduce任务个即1000个中间文件，只是追加内容，且不用排序； Sorted shuffle中，map端一个core会生成map任务个即1000个中间数据文件，追加内容，但需要排序，并生成索引文件。   Shuffle read阶段： 两种方式的成本差不多，或者说Sorted shuffle的成本略高，因为有个根据索引文件定位内容再读取，而hashed shuffle是直接从确定的文件中取。   这么看来Hash-based shuffle没有排序和生产索引文件的成本，理论是比Sorted shuffle性能更好的，但为什么现在抛弃了优化后的Hash-based shuffle?      
2017-04-17 0 0
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灰色天使国shp

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老师帮忙解答一下 由于spark 会生成有很多 partition 怎么控制连接数据库的连接数？
2017-04-17 0 0
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