㈠ 如何使用sbt打包scala程序
創建工程目錄
在工程目錄下面建立build.sbt
放讓衫正入源碼
構建 ：坦悔 sbt build
運行 ： sbt run
運行測試 ：塌帶 sbt test
清理 ： sbt clean
㈡ apache kafka源碼怎麼編譯
Kafka is a distributed, partitioned, replicated commit log service. It provides the functionality of a messaging system, but with a unique design.(Kafka是一個分布式的、可分區的(partitioned)、基於備份的(replicated)和commit-log存儲的服務.。它提供了類似於messaging system的特性,但是在設計實現上完全不同)。kafka是一種高吞吐量的分布式發布訂閱消息系統，它有如下特性：
（1）、通過O(1)的磁碟數據結構提供消息的持久化，這種結構對於即使數以TB的消息存儲也能夠保持長時間的穩定性能。
（2）、高吞吐量：即使是非常普通的硬體kafka也可以支持每秒數十萬的消息。
（3）、支持通過kafka伺服器和消費機集群來分區消息。
（4）、支持Hadoop並行數據載入。
一、用Kafka裡面自帶的腳本進行編譯
下載好了Kafka源碼，裡面自帶了一個gradlew的腳本，我們可以利用這個編譯Kafka源碼：
1 # wget http://mirror.bit.e.cn/apache/kafka/0.8.1.1/kafka-0.8.1.1-src.tgz
2 # tar -zxf kafka-0.8.1.1-src.tgz
3 # cd kafka-0.8.1.1-src
4 # ./gradlew releaseTarGz
運行上面的命令進行編譯將會出現以下的異常信息：
01 :core:signArchives FAILED
02
03 FAILURE: Build failed with an exception.
04
05 * What went wrong:
06 Execution failed for task ':core:signArchives'.
07 > Cannot perform signing task ':core:signArchives' because it
08 has no configured signatory
09
10 * Try:
11 Run with --stacktrace option to get the stack trace. Run with
12 --info or --debug option to get more log output.
13
14 BUILD FAILED
這是一個bug（https://issues.apache.org/jira/browse/KAFKA-1297），可以用下面的命令進行編譯
1 ./gradlew releaseTarGzAll -x signArchives
這時候將會編譯成功（在編譯的過程中將會出現很多的）。在編譯的過程中，我們也可以指定對應的Scala版本進行編譯：
1 ./gradlew -PscalaVersion=2.10.3 releaseTarGz -x signArchives
編譯完之後將會在core/build/distributions/裡面生成kafka_2.10-0.8.1.1.tgz文件，這個和從網上下載的一樣，可以直接用。
二、利用sbt進行編譯
我們同樣可以用sbt來編譯Kafka，步驟如下：
01 # git clone https://git-wip-us.apache.org/repos/asf/kafka.git
02 # cd kafka
03 # git checkout -b 0.8 remotes/origin/0.8
04 # ./sbt update
05 [info] [SUCCESSFUL ] org.eclipse.jdt#core;3.1.1!core.jar (2243ms)
06 [info] downloading http://repo1.maven.org/maven2/ant/ant/1.6.5/ant-1.6.5.jar ...
07 [info] [SUCCESSFUL ] ant#ant;1.6.5!ant.jar (1150ms)
08 [info] Done updating.
09 [info] Resolving org.apache.hadoop#hadoop-core;0.20.2 ...
10 [info] Done updating.
11 [info] Resolving com.yammer.metrics#metrics-annotation;2.2.0 ...
12 [info] Done updating.
13 [info] Resolving com.yammer.metrics#metrics-annotation;2.2.0 ...
14 [info] Done updating.
15 [success] Total time: 168 s, completed Jun 18, 2014 6:51:38 PM
16
17 # ./sbt package
18 [info] Set current project to Kafka (in build file:/export1/spark/kafka/)
19 Getting Scala 2.8.0 ...
20 :: retrieving :: org.scala-sbt#boot-scala
21 confs: [default]
22 3 artifacts copied, 0 already retrieved (14544kB/27ms)
23 [success] Total time: 1 s, completed Jun 18, 2014 6:52:37 PM
對於Kafka 0.8及以上版本還需要運行以下的命令：
01 # ./sbt assembly-package-dependency
02 [info] Loading project definition from /export1/spark/kafka/project
03 [warn] Multiple resolvers having different access mechanism configured with
04 same name 'sbt-plugin-releases'. To avoid conflict, Remove plicate project
05 resolvers (`resolvers`) or rename publishing resolver (`publishTo`).
06 [info] Set current project to Kafka (in build file:/export1/spark/kafka/)
07 [warn] Credentials file /home/wyp/.m2/.credentials does not exist
08 [info] Including slf4j-api-1.7.2.jar
09 [info] Including metrics-annotation-2.2.0.jar
10 [info] Including scala-compiler.jar
11 [info] Including scala-library.jar
12 [info] Including slf4j-simple-1.6.4.jar
13 [info] Including metrics-core-2.2.0.jar
14 [info] Including snappy-java-1.0.4.1.jar
15 [info] Including zookeeper-3.3.4.jar
16 [info] Including log4j-1.2.15.jar
17 [info] Including zkclient-0.3.jar
18 [info] Including jopt-simple-3.2.jar
19 [warn] Merging 'META-INF/NOTICE' with strategy 'rename'
20 [warn] Merging 'org/xerial/snappy/native/README' with strategy 'rename'
21 [warn] Merging 'META-INF/maven/org.xerial.snappy/snappy-java/LICENSE'
22 with strategy 'rename'
23 [warn] Merging 'LICENSE.txt' with strategy 'rename'
24 [warn] Merging 'META-INF/LICENSE' with strategy 'rename'
25 [warn] Merging 'META-INF/MANIFEST.MF' with strategy 'discard'
26 [warn] Strategy 'discard' was applied to a file
27 [warn] Strategy 'rename' was applied to 5 files
28 [success] Total time: 3 s, completed Jun 18, 2014 6:53:41 PM
當然，我們也可以在sbt裡面指定scala的版本：
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10 sbt "++2.10.3 update"
11 sbt "++2.10.3 package"
12 sbt "++2.10.3 assembly-package-dependency"