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DagScheduler = new DAGScheduler(this). DAGScheduler cannot be initialized due to %s. SparkContext has been shutdown. Job %d finished: %s, took %f s. Job %d failed: %s, took %f s. Blocking the thread until supervisor is started, which ensures eventProcessActor is. Not null before any job is submitted. New stage creation may throw an exception if, for example, jobs are run on a. HadoopRDD whose underlying HDFS files have been deleted. Creating new stage failed due to exception - job:. S Task serialization ...

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DagScheduler = new DAGScheduler(this). DAGScheduler cannot be initialized due to %s. SparkContext has been shutdown. Job %d finished: %s, took %f s. Job %d failed: %s, took %f s. Blocking the thread until supervisor is started, which ensures eventProcessActor is. Not null before any job is submitted. New stage creation may throw an exception if, for example, jobs are run on a. HadoopRDD whose underlying HDFS files have been deleted. Creating new stage failed due to exception - job:. S Task serialization ...

<META> KEYWORDS

1 guozhongxin's blog

2 spark dagscheduler模块源码解析

3 spark dagscheduler的背景知识

4 stage

5 下图是一个stage例子

6 stage有两种

7 shufflemapstage

8 在一个job里可能有该类型的stage，也可以能没有该类型stage

9 上图stage 1，stage 2都属于shufflemapstage

10 resultstage

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guozhongxin's blog,spark dagscheduler模块源码解析,spark dagscheduler的背景知识,stage,下图是一个stage例子,stage有两种,shufflemapstage,在一个job里可能有该类型的stage，也可以能没有该类型stage,上图stage 1，stage 2都属于shufflemapstage,resultstage,这种stage是直接输出结果,resultstage的最后task就是resulttask,dagscheduler

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guozhongxin's blog | guozhongxin.com Reviews

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DagScheduler = new DAGScheduler(this). DAGScheduler cannot be initialized due to %s. SparkContext has been shutdown. Job %d finished: %s, took %f s. Job %d failed: %s, took %f s. Blocking the thread until supervisor is started, which ensures eventProcessActor is. Not null before any job is submitted. New stage creation may throw an exception if, for example, jobs are run on a. HadoopRDD whose underlying HDFS files have been deleted. Creating new stage failed due to exception - job:. S Task serialization ...

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源码 -guozhongxin's blog

http://guozhongxin.com/tag/yuan-ma.html

Windows IDEA SBT 打造Spark源码阅读环境. 有两个版本 Ultimate Edition and Community Edition，后者是free的，而且完全能满足学习者所有的需求. 我的电脑右键，属性 - 高级系统设置 - 环境变量 ,没有的手动将Scala文件夹下的bin目录的路径. 打开IDEA，在‘Welcome to IntelliJ IDEA’界面的‘Quick Start’栏，点击. Import project from external model.

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ganglia -guozhongxin's blog

http://guozhongxin.com/category/ganglia.html

可以监视和显示集群中的节点的各种状态信息，比如如 cpu 、mem、硬盘利用率， I/O负载、网络流量情况等，同时可以将历史数据以曲线方式通过php页面呈现。 Ganglia监控系统的核心有两部分 gmond 和 gmetad. RRD Round-Robin Database 是一种固定大小的环形的数据库，一个RRD文件下可以有多个RRA，每个RRA是一个环，环上可以储存的数据个数是固定个，新的数据被记录时会覆盖最旧的那条数据，从而周而复始的记录。第二个RRA一共储存着244个数据，每插入24条数据取平均数，储存一个数据，15s * 24 = 360s，意味着6分钟储存一条数据。总共记录了 6min * 244 = 1464min = 24.4h 约为一天的数据。第三个RRA，每插入168条数据取平均数储存一条数据，15s * 168 = 42min，42分钟记录一条数据，总共记录 42min * 244 = 7.1d 约为一周的数据。 Data source my cluster [polling interval] address1:port addreses2:port .

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spark配置与性能分析-guozhongxin's blog

http://guozhongxin.com/pages/2015/01/18/spark_performance.html

4

guozhongxin's blog

http://guozhongxin.com/author/guozhongxin.html

DagScheduler = new DAGScheduler(this). DAGScheduler cannot be initialized due to %s. SparkContext has been shutdown. Job %d finished: %s, took %f s. Job %d failed: %s, took %f s. Blocking the thread until supervisor is started, which ensures eventProcessActor is. Not null before any job is submitted. New stage creation may throw an exception if, for example, jobs are run on a. HadoopRDD whose underlying HDFS files have been deleted. Creating new stage failed due to exception - job:. S Task serialization ...

5

Spark简介-guozhongxin's blog

http://guozhongxin.com/pages/2014/10/12/a_brief_in_spark.html

一种粗粒度数据并行 data parallel 的计算范式相对于 task parallel. A list of partitions;. A function for computing each split. A list of dependencies on other RDDs: HadoopRDD，ShuffledRDD，PartitionPruningRDD. 输入算子 val lines = sc.textFile("data.txt"). 缓存算子 lines.cache(), lines.persist(). 变换算子(Transformations) create a new dataset from an existing one，由一个或多个已存在的RDD转换成另外一个RDD map(), filter(), group(), flatmap(). 有向无环图，其中每一个顶点是RDD 包括生产该RDD 的算子，从父RDD到子RDD有边，表示RDD间的依赖性。 Spark通用的使用方式主要有两种 standalone、spark on yarn. 基于YARN的...

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DagScheduler = new DAGScheduler(this). DAGScheduler cannot be initialized due to %s. SparkContext has been shutdown. Job %d finished: %s, took %f s. Job %d failed: %s, took %f s. Blocking the thread until supervisor is started, which ensures eventProcessActor is. Not null before any job is submitted. New stage creation may throw an exception if, for example, jobs are run on a. HadoopRDD whose underlying HDFS files have been deleted. Creating new stage failed due to exception - job:. S Task serialization ...

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