【Flink】Flink的编译(包含hadoop的依赖) - Go语言中文社区

【Flink】Flink的编译(包含hadoop的依赖)


好久没写文章了,手都有点生。

菜鸡一只,如果有说错的还请大家批评!

最近工作上的事情还是有点忙的,主要都是一些杂活,不干又不行,干了好像提升又不多,不过拿人家手短吃人家嘴软,既然拿了工资就应该好好的干活,当然前提是需求相对合理的情况嘿嘿~

近来Flink的势头有点猛啊,它和spark的区别在于:spark更倾向于批处理或者微批处理(spark现在的发展方向往人工智能的分布式算法上走了),但是Flink确确实实是为流诞生的(当然也可以做批处理就是了),不过现行的Flink版本还是有缺陷的,比如不能很好的支持Hive(毕竟还是有绝大多数公司在使用Hive作为数据仓库的),不过印象中好像说Flink在1.9的版本后,会开始支持Hive,那就很棒棒了!

闲话不多说,开始编译!

1、首先下载源码

https://github.com/apache/flink/

大家各自选择合适的版本,我一开始选择的是最新的1.9版本,我发现有些(hadoop的)包,找不到,还挺头疼的,最后我选择了1.7的版本来完成编译。其实如果是自己玩玩,我还是更喜欢最新的版本的,哎可惜了!

 

2、上传服务器,解压

下载好源码之后一般是:flink-release-1.7.zip  这个样子

然后 unzip flink-release-1.7.zip 得到文件夹

 

3、编译前的准备

需要Maven 3和至少JDK1.8

这两个东西应该没问题吧,如果搞不定可以百度下,如果百度完还搞不定,那可能。。。。暂时还是不要编译吧,先把基础学好,原理搞清楚,想用Flink的话去官网下载官方编译好的版本吧

如果你的服务器上执行这两个命令,也能看到对应的回显信息,那证明你的前置环境应该是没问题了!

 

4、开始编译

进入到解压好的flink文件夹中,如图(我是已经编译好的文件夹,所以大家可能会看到一些源码中没有的文件或者文件夹):

# 最基础的编译方法,听说会自动使用pom里面的hadoop版本去编译,但是一般情况下,我们都会有自己指定的版本,所以一般不会用这个
mvn clean install -DskipTests


# 另一种编译命令,相对于上面这个命令,主要的确保是:
# 不编译tests、QA plugins和JavaDocs,因此编译要更快一些
mvn clean install -DskipTests -Dfast

 
# 如果你需要使用指定hadoop的版本,可以通过指定"-Dhadoop.version"来设置,编译命令如下:
mvn clean install -DskipTests -Dhadoop.version=2.6.0
# 或者
mvn clean install -DskipTests -Pvendor-repos -Dhadoop.version=2.6.0-cdh5.12.1


# 但是我发现使用cdh版本的时候,老是有这个或者那个flink集成hadoop的jar包下载不到,还是挺麻烦的,所以我最后选择的是

mvn clean install -DskipTests -Dhadoop.version=2.6.0

 

5、虽然执行了命令,但是会有各种报错!

异常类型一:

如下图(这里引用了作者:青蓝莓的文章的截图):

这是一个共性问题,有些包找不到,或者下不到解决方案就是手动安装

比如图中缺少kafka的包

mvn install:install-file -DgroupId=io.confluent -DartifactId=kafka-schema-registry-client -Dversion=3.3.1 -Dpackaging=jar  -Dfile=E:bigdata_flinkpackageskafka-schema-registry-client-3.3.1.jar

比如缺少

Could not find artifact com.mapr.hadoop:maprfs:jar:5.2.1-mapr

# 1.下载
# 手动下载jar包 https://repository.mapr.com/nexus/content/groups/mapr-public/com/mapr/hadoop/maprfs/5.2.1-mapr/maprfs-5.2.1-mapr.jar然后扔到服务器上的/opt/bianyi/jar路径上
# 2.安装
mvn install:install-file -DgroupId=com.mapr.hadoop -DartifactId=maprfs -Dversion=5.2.1-mapr -Dpackaging=jar  -Dfile=/opt/bianyi/jar/maprfs-5.2.1-mapr.jar

通过这种方式,就可以把这个jar包放在自己maven的仓库的对应路径下!

异常类型二:(这种报错我没有实际遇到过,但我看有些人编译的时候有遇到)

例如:https://blog.csdn.net/qq475781638/article/details/90260202(作者:灰二和杉菜)

如果有些如下类型的报错

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project XXXflink的某个模块: Compilation failure: Compilation failure:
[ERROR] XXXXX某个类.java:[70,44] 程序包org.apache.XXXX不存在
[ERROR] XXXXX某个类.java:[73,45] 找不到符号
[ERROR]   符号:   类 XXX某个类名
[ERROR]   位置: 程序包 XXX某个包
[ERROR] XXX某个路径XX某个类.java:[73,93] 找不到符号

这种还蛮有可能是pom里面缺少了某些依赖,尝试找到这个类是在哪个依赖,然后去中央仓库找出来,通过pom的形式添加到flink对应子项目的pom里面,详细可以看看上面那篇博客的编译报错2

异常类型三:

这种报错,我还真是见了鬼了

[ERROR] Failed to execute goal on project flink-mapr-fs: Could not resolve dependencies for project org.apache.flink:flink-mapr-fs:jar:1.7-SNAr:5.2.1-mapr: Failed to read artifact descriptor for com.mapr.hadoop:maprfs:jar:5.2.1-mapr: Could not transfer artifact com.mapr.hadoop:maprfs/maven/): sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: un 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal on project flink-mapr-fs: Could not resolve dependencies for prollect dependencies at com.mapr.hadoop:maprfs:jar:5.2.1-mapr
    at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies (LifecycleDependencyResolver.java:249)
.....
.....
Caused by: org.apache.maven.project.DependencyResolutionException: Could not resolve dependencies for project org.apache.flink:flink-mapr-fs:j:maprfs:jar:5.2.1-mapr
    at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve (DefaultProjectDependenciesResolver.java:178)
.....
.....
Caused by: org.eclipse.aether.collection.DependencyCollectionException: Failed to collect dependencies at com.mapr.hadoop:maprfs:jar:5.2.1-map
    at org.eclipse.aether.internal.impl.DefaultDependencyCollector.collectDependencies (DefaultDependencyCollector.java:293)
.....
.....
Caused by: org.eclipse.aether.resolution.ArtifactDescriptorException: Failed to read artifact descriptor for com.mapr.hadoop:maprfs:jar:5.2.1-
    at org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom (DefaultArtifactDescriptorReader.java:276)
.....
.....
Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Could not transfer artifact com.mapr.hadoop:maprfs:pom:5.2.1-mapr from/t.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid cer
    at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve (DefaultArtifactResolver.java:422)
.....
.....
Caused by: org.eclipse.aether.transfer.ArtifactTransferException: Could not transfer artifact com.mapr.hadoop:maprfs:pom:5.2.1-mapr from/to maidator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certifi
    at org.eclipse.aether.connector.basic.ArtifactTransportListener.transferFailed (ArtifactTransportListener.java:52)
.....
Caused by: org.apache.maven.wagon.TransferFailedException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.d certification path to requested target
    at org.apache.maven.wagon.providers.http.AbstractHttpClientWagon.resourceExists (AbstractHttpClientWagon.java:742)

反正报错真的挺长的,我百度了一段时间,居然发现是什么:缺少安全证书时出现的异常。

解决问题方法:

将你要访问的webservice/url....的安全认证证书导入到客户端即可。

以下是获取安全证书的一种方法,通过以下程序获取安全证书:

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
 
public class InstallCert {
 
    public static void main(String[] args) throws Exception {
        String host;
        int port;
        char[] passphrase;
        if ((args.length == 1) || (args.length == 2)) {
            String[] c = args[0].split(":");
            host = c[0];
            port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);
            String p = (args.length == 1) ? "changeit" : args[1];
            passphrase = p.toCharArray();
        } else {
            System.out
                    .println("Usage: java InstallCert <host>[:port] [passphrase]");
            return;
        }
 
        File file = new File("jssecacerts");
        if (file.isFile() == false) {
            char SEP = File.separatorChar;
            File dir = new File(System.getProperty("java.home") + SEP + "lib"
                    + SEP + "security");
            file = new File(dir, "jssecacerts");
            if (file.isFile() == false) {
                file = new File(dir, "cacerts");
            }
        }
        System.out.println("Loading KeyStore " + file + "...");
        InputStream in = new FileInputStream(file);
        KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
        ks.load(in, passphrase);
        in.close();
 
        SSLContext context = SSLContext.getInstance("TLS");
        TrustManagerFactory tmf = TrustManagerFactory
                .getInstance(TrustManagerFactory.getDefaultAlgorithm());
        tmf.init(ks);
        X509TrustManager defaultTrustManager = (X509TrustManager) tmf
                .getTrustManagers()[0];
        SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
        context.init(null, new TrustManager[] { tm }, null);
        SSLSocketFactory factory = context.getSocketFactory();
 
        System.out
                .println("Opening connection to " + host + ":" + port + "...");
        SSLSocket socket = (SSLSocket) factory.createSocket(host, port);
        socket.setSoTimeout(10000);
        try {
            System.out.println("Starting SSL handshake...");
            socket.startHandshake();
            socket.close();
            System.out.println();
            System.out.println("No errors, certificate is already trusted");
        } catch (SSLException e) {
            System.out.println();
            e.printStackTrace(System.out);
        }
 
        X509Certificate[] chain = tm.chain;
        if (chain == null) {
            System.out.println("Could not obtain server certificate chain");
            return;
        }
 
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                System.in));
 
        System.out.println();
        System.out.println("Server sent " + chain.length + " certificate(s):");
        System.out.println();
        MessageDigest sha1 = MessageDigest.getInstance("SHA1");
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        for (int i = 0; i < chain.length; i++) {
            X509Certificate cert = chain[i];
            System.out.println(" " + (i + 1) + " Subject "
                    + cert.getSubjectDN());
            System.out.println("   Issuer  " + cert.getIssuerDN());
            sha1.update(cert.getEncoded());
            System.out.println("   sha1    " + toHexString(sha1.digest()));
            md5.update(cert.getEncoded());
            System.out.println("   md5     " + toHexString(md5.digest()));
            System.out.println();
        }
 
        System.out
                .println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");
        String line = reader.readLine().trim();
        int k;
        try {
            k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;
        } catch (NumberFormatException e) {
            System.out.println("KeyStore not changed");
            return;
        }
 
        X509Certificate cert = chain[k];
        String alias = host + "-" + (k + 1);
        ks.setCertificateEntry(alias, cert);
 
        OutputStream out = new FileOutputStream("jssecacerts");
        ks.store(out, passphrase);
        out.close();
 
        System.out.println();
        System.out.println(cert);
        System.out.println();
        System.out
                .println("Added certificate to keystore 'jssecacerts' using alias '"
                        + alias + "'");
    }
 
    private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();
 
    private static String toHexString(byte[] bytes) {
        StringBuilder sb = new StringBuilder(bytes.length * 3);
        for (int b : bytes) {
            b &= 0xff;
            sb.append(HEXDIGITS[b >> 4]);
            sb.append(HEXDIGITS[b & 15]);
            sb.append(' ');
        }
        return sb.toString();
    }
 
    private static class SavingTrustManager implements X509TrustManager {
 
        private final X509TrustManager tm;
        private X509Certificate[] chain;
 
        SavingTrustManager(X509TrustManager tm) {
            this.tm = tm;
        }
 
        public X509Certificate[] getAcceptedIssuers() {
            throw new UnsupportedOperationException();
        }
 
        public void checkClientTrusted(X509Certificate[] chain, String authType)
                throws CertificateException {
            throw new UnsupportedOperationException();
        }
 
        public void checkServerTrusted(X509Certificate[] chain, String authType)
                throws CertificateException {
            this.chain = chain;
            tm.checkServerTrusted(chain, authType);
        }
    }
 
}

-1.vi InstallCert.java,把上面的java代码复制进去保存

-2.javac InstallCert .java 编译生成class文件

-3.执行class文件

我的报错是在下载相关jar包的时候出问题的,如图:

 

所以我猜应该是访问这个url:repository.mapr.com出现安全问题的,因此执行:

java InstallCert repository.mapr.com

-4.接着输入1,回车,就会在当前目录下生成一个jssecacerts

-5.最后将jssecacerts证书文件拷贝到$JAVA_HOME/jre/lib/security目录下,就ok了

-6.然后重新执行编译命令

可以尝试:mvn clean install -DskipTests -Dhadoop.version=2.6.0 -rf :flink-mapr-fs,跳过前面的阶段,直接从flink-mapr-fs这个地方往后开始编译

 

6、命令执行完,就会编译成功

可以将那个flink-1.7-SNAPSHOT-bin打包,放到其他服务器上去作为客户端,后面的就是flink的使用知识了,本篇文章就不多说了!

 

好了菜鸡一只,这个编译也是费了我老大的力气!!希望对各位的学习有帮助,如果各位在编译中有遇到本文中没有提过的问题,欢迎大家留言讨论,谢谢~

 

版权声明:本文来源CSDN,感谢博主原创文章,遵循 CC 4.0 by-sa 版权协议,转载请附上原文出处链接和本声明。
原文链接:https://blog.csdn.net/lsr40/article/details/98034838
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  • 发表于 2021-05-22 11:19:21
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