Spark 框架
Spark与Storm的对比
对于Storm来说：
1、建议在那种需要纯实时，不能忍受1秒以上延迟的场景下使用，比如实时金融系统，要求纯实时进行金融交易和分析
2、此外，如果对于实时计算的功能中，要求可靠的事务机制和可靠性机制，即数据的处理完全精准，一条也不能多，一条也不能少，也可以考虑使用Storm
3、如果还需要针对高峰低峰时间段，动态调整实时计算程序的并行度，以最大限度利用集群资源（通常是在小型公司，集群资源紧张的情况），也可以考虑用Storm
4、如果一个大数据应用系统，它就是纯粹的实时计算，不需要在中间执行SQL交互式查询、复杂的transformation算子等，那么用Storm是比较好的选择
对于Spark Streaming来说：
1、如果对上述适用于Storm的三点，一条都不满足的实时场景，即，不要求纯实时，不要求强大可靠的事务机制，不要求动态调整并行度，那么可以考虑使用Spark Streaming
2、考虑使用Spark Streaming最主要的一个因素，应该是针对整个项目进行宏观的考虑，即，如果一个项目除了实时计算之外，还包括了离线批处理、交互式查询等业务功能，而且实时计算中，可能还会牵扯到高延迟批处理、交互式查询等功能，那么就应该首选Spark生态，用Spark Core开发离线批处理，用Spark SQL开发交互式查询，用Spark Streaming开发实时计算，三者可以无缝整合，给系统提供非常高的可扩展性
Spark Streaming与Storm的优劣分析
事实上，Spark Streaming绝对谈不上比Storm优秀。这两个框架在实时计算领域中，都很优秀，只是擅长的细分场景并不相同。
Spark Streaming仅仅在吞吐量上比Storm要优秀，而吞吐量这一点，也是历来挺Spark Streaming，贬Storm的人着重强调的。但是问题是，是不是在所有的实时计算场景下，都那么注重吞吐量？不尽然。因此，通过吞吐量说Spark Streaming强于Storm，不靠谱。
Storm在实时延迟度上，比Spark Streaming就好多了，前者是纯实时，后者是准实时。而且，Storm的事务机制、健壮性 / 容错性、动态调整并行度等特性，都要比Spark Streaming更加优秀。
Spark Streaming，有一点是Storm绝对比不上的，就是：它位于Spark生态技术栈中，因此Spark Streaming可以和Spark Core、Spark SQL无缝整合，也就意味着，我们可以对实时处理出来的中间数据，立即在程序中无缝进行延迟批处理、交互式查询等操作。这个特点大大增强了Spark Streaming的优势和功能
下载 spark、scala的包
如下操作：
[hadoop@oversea-stable ~]$ wget http://mirrors.hust.edu.cn/apache/spark/spark-2.3.0/spark-2.3.0-bin-hadoop2.7.tgz
--2018-06-27 10:07:25-- http://mirrors.hust.edu.cn/apache/spark/spark-2.3.0/spark-2.3.0-bin-hadoop2.7.tgz
Resolving mirrors.hust.edu.cn (mirrors.hust.edu.cn)... 202.114.18.160
Connecting to mirrors.hust.edu.cn (mirrors.hust.edu.cn)|202.114.18.160|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 226128401 (216M) [application/octet-stream]
Saving to: ‘spark-2.3.0-bin-hadoop2.7.tgz’
100%[================================================================================================================>] 226,128,401 45.4KB/s in 68m 12s
2018-06-27 11:15:38 (54.0 KB/s) - ‘spark-2.3.0-bin-hadoop2.7.tgz’ saved [226128401/226128401]
[hadoop@oversea-stable ~]$
[hadoop@oversea-stable ~]$ wget https://scala-lang.org/files/archive/nightly/2.12.x/scala-2.12.5-bin-3995c7e.tgz
--2018-06-27 11:50:02-- https://scala-lang.org/files/archive/nightly/2.12.x/scala-2.12.5-bin-3995c7e.tgz
Resolving scala-lang.org (scala-lang.org)... 128.178.154.159
Connecting to scala-lang.org (scala-lang.org)|128.178.154.159|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 20244926 (19M) [application/x-gzip]
Saving to: ‘scala-2.12.5-bin-3995c7e.tgz’
100%[================================================================================================================>] 20,244,926 516KB/s in 4m 39s
2018-06-27 11:54:43 (70.8 KB/s) - ‘scala-2.12.5-bin-3995c7e.tgz’ saved [20244926/20244926]配置环境变量
如下操作：
[hadoop@oversea-stable ~]$ tail -4 .bash_profile
export SCALA_HOME=/opt/scala
export SPARK_HOME=/opt/spark
PATH=$JAVA_HOME/bin:$HADOOP_HOME/bin:$HBASE_HOME/bin:$SCALA_HOME/bin:$SPARK_HOME/bin:$PATH
export PATH
[hadoop@oversea-stable ~]$配置并同步scala
操作如下：
[hadoop@oversea-stable ~]$ tar xfz scala-2.12.5-bin-3995c7e.tgz -C /opt/
[hadoop@oversea-stable opt]$ ln -s scala-2.12.5-bin-3995c7e scala
[hadoop@oversea-stable opt]$ for((i=67;i>=64;i--));do rsync -avzoptlg scala-2.12.5-bin-3995c7e 192.168.20.$i:/opt/ ; done 配置并同步spark
操作如下：
[hadoop@oversea-stable ~]$ tar xfz spark-2.3.0-bin-hadoop2.7.tgz -C /opt/
[hadoop@oversea-stable ~]$ cd /opt/
[hadoop@oversea-stable opt]$ ln -s spark-2.3.0-bin-hadoop2.7 spark
[hadoop@oversea-stable opt]$ cd spark/conf
[hadoop@oversea-stable conf]$ pwd
/opt/spark/conf
[hadoop@oversea-stable conf]$ cp spark-env.sh{.template,}
[hadoop@oversea-stable conf]$ vim spark-env.sh
[hadoop@oversea-stable conf]$ tail -8 spark-env.sh
export SCALA_HOME=/opt/spark
export JAVA_HOME=/usr/java/latest
export SPARK_MASTER_IP=192.168.20.68
export SPARK_WORKER_MEMORY=1024m
export HADOOP_CONF_DIR=/opt/hadoop/etc/hadoop
export SPARK_DIST_CLASSPATH=$(/opt/hadoop/bin/hadoop classpath)
export SPARK_LOCAL_IP=192.168.20.68 #修改为每个node本身的IP
export SPARK_MASTER_HOST=192.168.20.68
[hadoop@oversea-stable conf]$
[hadoop@oversea-stable conf]$ cp slaves{.template,}
[hadoop@oversea-stable conf]$ vim slaves
[hadoop@oversea-stable conf]$ tail -3 slaves
open-stable
permission-stable
sp-stable
[hadoop@oversea-stable conf]$
[hadoop@oversea-stable conf]$ cd /opt
[hadoop@oversea-stable opt]$ for((i=67;i>=64;i--));do rsync -avzoptlg spark-2.3.0-bin-hadoop2.7 192.168.20.$i:/opt/ ; done启动spark
操作如下所示：
[hadoop@oversea-stable opt]$ cd spark
[hadoop@oversea-stable spark]$ sbin/start-slaves.sh
open-stable: starting org.apache.spark.deploy.worker.Worker, logging to /opt/spark/logs/spark-hadoop-org.apache.spark.deploy.worker.Worker-1-open-stable.out
permission-stable: starting org.apache.spark.deploy.worker.Worker, logging to /opt/spark/logs/spark-hadoop-org.apache.spark.deploy.worker.Worker-1-permission-stable.out
sp-stable: starting org.apache.spark.deploy.worker.Worker, logging to /opt/spark/logs/spark-hadoop-org.apache.spark.deploy.worker.Worker-1-sp1-stable.out
[hadoop@oversea-stable spark]$ vim conf/slaves
[hadoop@oversea-stable spark]$ sbin/start-slaves.sh
open-stable: starting org.apache.spark.deploy.worker.Worker, logging to /opt/spark/logs/spark-hadoop-org.apache.spark.deploy.worker.Worker-1-open-stable.out
permission-stable: starting org.apache.spark.deploy.worker.Worker, logging to /opt/spark/logs/spark-hadoop-org.apache.spark.deploy.worker.Worker-1-permission-stable.out
[hadoop@oversea-stable spark]$验证
(1) 检查log，确认无Error
[hadoop@oversea-stable spark]$ cd logs
[hadoop@oversea-stable logs]$ ls
spark-hadoop-org.apache.spark.deploy.master.Master-1-oversea-stable.out
[hadoop@oversea-stable logs]$ (2) 查看各server 进程状态
[hadoop@oversea-stable logs]$ jps
12480 DFSZKFailoverController
27522 HMaster
6738 Master
7301 Jps
12123 NameNode
12588 ResourceManager
[hadoop@oversea-stable logs]$
[hadoop@open-stable logs]$ jps
15248 JournalNode
15366 NodeManager
16248 Jps
16169 Worker
15131 DataNode
18125 QuorumPeerMain
22781 HRegionServer
[hadoop@open-stable logs]$
[hadoop@permission-stable logs]$ jps
12800 QuorumPeerMain
24391 NodeManager
4647 Jps
24152 DataNode
4568 Worker
2236 HRegionServer
24269 JournalNode
[hadoop@permission-stable logs]$
[hadoop@sp1-stable logs]$ jps
7617 QuorumPeerMain
9233 Jps
21683 NodeManager
21540 JournalNode
28966 HRegionServer
21451 DataNode
8813 Worker
[hadoop@sp1-stable logs]$(3) 运行spark-shell
[hadoop@oversea-stable logs]$ spark-shell
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/spark-2.3.0-bin-hadoop2.7/jars/slf4j-log4j12-1.7.16.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/hadoop-2.9.1/share/hadoop/common/lib/slf4j-log4j12-1.7.25.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]
2018-06-27 15:15:49 WARN NativeCodeLoader:62 - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Setting default log level to "WARN".
To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel).
Spark context Web UI available at http://oversea-stable:4040
Spark context available as 'sc' (master = local[*], app id = local-1530083761130).
Spark session available as 'spark'.
Welcome to
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/___/ .__/\_,_/_/ /_/\_\ version 2.3.0
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Using Scala version 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_172)
Type in expressions to have them evaluated.
Type :help for more information.
scala> (4) 在web 浏览器中查看spark master 的状态