Spark基礎(chǔ)

官方文檔：spark.apache.org/docs/latest

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Spark背景

??? MapReduce局限性：
??? 1>) 繁雜
??????????? map/reduce (mapjoin沒有reduce)
??????????? low_level
??????????? constained
??????????? 需求 測試 每次改代碼再測試
??? 2>) 技術(shù)效率低
??????? 進程幾百：MapTask ReduceTask??? JVM復(fù)用
??????? IO: chain? 網(wǎng)絡(luò)+磁盤
??????? 排序：都要排序 ：面試題：key類型是實現(xiàn)什么接口？
??????? Memory:
??????? ...
??????? 不適合迭代處理
??????? 不適合實時流式處理
???????
??? 很多框架各自為戰(zhàn)
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Spark概述和特點

spark.apache.org

??? Speed
??????? memory
??????? thread
??????? sort （可設(shè)置）
???????
??????? DAG rdd.map.filter....collect
???????
??? Ease of use
??????? high-level operators: join、 group 、 count。。。
???????
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??? generality
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??? Runs Everywhere
???
???
小結(jié)：
??? fast + general engine
??????? write code: java/Scala/Python/R? interactive shell
??????? run:memory/ADG/thread model/.....
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版本介紹和選擇依據(jù)參考：

??? 如何學(xué)習(xí)Spark
??????? mail list
??????? user@spark.apache.org
??????? apache-spark-user-list/
??????? meetup/峰會
??????? 源碼樣例
??????? github.com/apache/spark
??????? source code
???????

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環(huán)境：
centos6
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???? hadoop000(hadoop) hadoop001 hadoop002
???? app 存放安裝軟件的目錄
???? software 存放軟件包的tar
???? data 存放測試數(shù)據(jù)
???? lib存放我們自己的jar
???? source 存放源碼的位置
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Spark安裝

官網(wǎng)下載源碼解壓
????
????
???? 編譯Spark源碼的前置要求
???? java 8+, Python 2.7+/3.4+?? Spark 2.3.0? Scala 2.11.xx
???? 安裝jdk
????
? apache-maven安裝
???? 解壓配置.bash_proile
???? export MAVEN_HOME/home/hadoop/app/apache-maven-3.3.9
???? export PATH=$MAVE_HOME/bin:$PATH
????
???? 建議：修改maven本地倉庫的地址 $MAVE_HOME/conf/setting.xml
???? <lcoalRepository>/home/hadoop/mave_repo</lcoalRepository>
????
? 安裝scala-2.11.9.tgz
???? 解壓配置.bash_proile
???? export MAVEN_HOME/home/hadoop/app/scala-2.11.9
???? export PATH=$MAVE_HOME/bin:$PATH
????
???? source ~.bash_proile
???? 驗證：mvn -v
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???? git安裝下 yum install git
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編譯安裝
??? export MAVEN_OPTS="-Xmx2g -XX:ReservedCodeCacheSize=512m"
??? ./build/mvn -DskipTests clean package
????
????
???? 修改源碼編碼默認hadoop版本
???? pom.xml
???? <hadoop.version2.6.5</hadoop.version>
???? <protobuf.version>2.5.0</protobuf.version>

???? profile
???? Apache Hadoop 2.7.x and later
??? ./build/mvn -pyarn -Phadoop-2.7 -Dhadoop.version=2.7.3 -DskipTests clean package
???? Hive 1.2.1 support
???? ./build/mvn -Pyarn -Phive -Phive -thriftserver -DskipTests clean package
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???????
????? 開發(fā)環(huán)境編譯?
????? ./build/mvn -pyarn -Phive -Phive -Phadoop-2.6 -Dhadoop.version=2.6.3 -DskipTests clean

???? 生產(chǎn)環(huán)境
????? ./dev/make-distribution.sh \
????? --name hadoop-2.6.0-cdh6.7.0 --(就填寫hadoop版本號) \
????? --tgz \
????? --Dhadoop.version=2.6.3 \
????? --Phadoop-2.6? \
????? --Phive -Phive-thriftserver \
????? --Pyarn
???????
???? 根據(jù)報錯配置倉庫源??
???????
???????
???? 修改腳本 加快編譯速度
??? vim make-distribution.zh? 注釋點下面幾個編譯檢查參數(shù)
??? VERSION=2.2.0
??? SCALA_VERSION=2.11
??? SPARK_HADOOP_VERSION=2.6.0-cdh6.7.0
??? SPARK_HIVE=1
????????
???????
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編譯文檔
http://spark.apache.org/docs/2.3.0/building-spark.html
more? --- building spark
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Spark安裝包目錄結(jié)構(gòu)說明
??? bin 存放客戶端相關(guān)腳本
??? conf 配置文件模板
??? data 存放測試數(shù)據(jù)
??? examples Spark 自帶的測試用例? 重點查看自帶的代碼樣例
??? jars???? jar包
??? sbin? 存放服務(wù)端相關(guān)腳本
??? yarn?? 存放yarn相關(guān)jar包
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源碼
github.com/apache/spark???????