我正在尝试使用 Hadoop 2.7.1 设置 Giraph 尽我所能,它似乎不起作用。
我试过以下链接,
当我尝试使用 mvn -Phadoop_yarn -Dhadoop.version=2.7.1 -DskipTests package 构建时会发生什么
hadoopuser:/usr/local/giraph$ mvn -Phadoop_yarn -Dhadoop.version=2.7.1 -DskipTests package
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] Apache Giraph Parent
[INFO] Apache Giraph Core
[INFO] Apache Giraph Examples
[INFO] Apache Giraph Distribution
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Apache Giraph Parent 1.1.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- mavanagaiata:0.5.0:branch (git-commit) @ giraph-parent ---
[INFO]
[INFO] --- mavanagaiata:0.5.0:commit (git-commit) @ giraph-parent ---
[INFO]
[INFO] --- maven-enforcer-plugin:1.2:enforce (default) @ giraph-parent ---
[INFO] Skipping Rule Enforcement.
[INFO]
[INFO] --- maven-dependency-versions-check-plugin:2.0.2:check (default) @ giraph-parent ---
[INFO]
[INFO] --- maven-remote-resources-plugin:1.4:process (default) @ giraph-parent ---
[INFO]
[INFO] --- maven-dependency-plugin:2.8:analyze-only (default) @ giraph-parent ---
[INFO] Skipping plugin execution
[INFO]
[INFO] --- maven-dependency-plugin:2.8:analyze-duplicate (default) @ giraph-parent ---
[INFO] Skipping plugin execution
[INFO]
[INFO] --- maven-dependency-plugin:2.8:analyze-dep-mgt (default) @ giraph-parent ---
[INFO] Skipping plugin execution
[INFO]
[INFO] --- maven-duplicate-finder-plugin:1.0.4:check (default) @ giraph-parent ---
[INFO]
[INFO] --- maven-site-plugin:3.3:attach-descriptor (attach-descriptor) @ giraph-parent ---
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Apache Giraph Core 1.1.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- mavanagaiata:0.5.0:branch (git-commit) @ giraph-core ---
[INFO]
[INFO] --- mavanagaiata:0.5.0:commit (git-commit) @ giraph-core ---
[INFO]
[INFO] --- maven-enforcer-plugin:1.2:enforce (default) @ giraph-core ---
[INFO] Skipping Rule Enforcement.
[INFO]
[INFO] --- maven-dependency-versions-check-plugin:2.0.2:check (default) @ giraph-core ---
[INFO]
[INFO] --- munge-maven-plugin:1.0:munge (munge) @ giraph-core ---
[INFO]
[INFO] --- maven-remote-resources-plugin:1.4:process (default) @ giraph-core ---
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ giraph-core ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 2 resources
[INFO] Copying 3 resources
[INFO]
[INFO] --- maven-compiler-plugin:3.0:compile (default-compile) @ giraph-core ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 711 source files to /usr/local/giraph/giraph-core/target/munged/classes
[INFO] -------------------------------------------------------------
[WARNING] COMPILATION WARNING :
[INFO] -------------------------------------------------------------
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/UnsafeByteArrayOutputStream.java:[42,29] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/UnsafeByteArrayOutputStream.java:[44,25] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/UnsafeByteArrayOutputStream.java:[57,32] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/UnsafeArrayReads.java:[39,32] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/UnsafeArrayReads.java:[42,29] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/UnsafeArrayReads.java:[44,25] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/DistributedCacheUtils.java: Some input files use or override a deprecated API.
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/DistributedCacheUtils.java: Recompile with -Xlint:deprecation for details.
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/TestGraph.java: Some input files use unchecked or unsafe operations.
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/TestGraph.java: Recompile with -Xlint:unchecked for details.
[INFO] 10 warnings
[INFO] -------------------------------------------------------------
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/comm/netty/SaslNettyClient.java:[84,68] cannot find symbol
symbol: variable SASL_PROPS
location: class org.apache.hadoop.security.SaslRpcServer
[ERROR] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/comm/netty/SaslNettyServer.java:[105,62] cannot find symbol
symbol: variable SASL_PROPS
location: class org.apache.hadoop.security.SaslRpcServer
[INFO] 2 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] Apache Giraph Parent ............................... SUCCESS [ 4.374 s]
[INFO] Apache Giraph Core ................................. FAILURE [ 8.469 s]
[INFO] Apache Giraph Examples ............................. SKIPPED
[INFO] Apache Giraph Distribution ......................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 13.136 s
[INFO] Finished at: 2015-11-16T10:19:07+05:30
[INFO] Final Memory: 45M/335M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.0:compile (default-compile) on project giraph-core: Compilation failure: Compilation failure:
[ERROR] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/comm/netty/SaslNettyClient.java:[84,68] cannot find symbol
[ERROR] symbol: variable SASL_PROPS
[ERROR] location: class org.apache.hadoop.security.SaslRpcServer
[ERROR] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/comm/netty/SaslNettyServer.java:[105,62] cannot find symbol
[ERROR] symbol: variable SASL_PROPS
[ERROR] location: class org.apache.hadoop.security.SaslRpcServer
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn <goals> -rf :giraph-cor
当我尝试使用 mvn -Phadoop_yarn -Dhadoop.version=2.7.1 -DskipTests install 构建时会发生什么
hadoopuser:/usr/local/giraph$ mvn -Phadoop_yarn -Dhadoop.version=2.7.1 -DskipTests install
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] Apache Giraph Parent
[INFO] Apache Giraph Core
[INFO] Apache Giraph Examples
[INFO] Apache Giraph Distribution
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Apache Giraph Parent 1.1.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- mavanagaiata:0.5.0:branch (git-commit) @ giraph-parent ---
[INFO]
[INFO] --- mavanagaiata:0.5.0:commit (git-commit) @ giraph-parent ---
[INFO]
[INFO] --- maven-enforcer-plugin:1.2:enforce (default) @ giraph-parent ---
[INFO] Skipping Rule Enforcement.
[INFO]
[INFO] --- maven-dependency-versions-check-plugin:2.0.2:check (default) @ giraph-parent ---
[INFO]
[INFO] --- maven-remote-resources-plugin:1.4:process (default) @ giraph-parent ---
[INFO]
[INFO] --- maven-dependency-plugin:2.8:analyze-only (default) @ giraph-parent ---
[INFO] Skipping plugin execution
[INFO]
[INFO] --- maven-dependency-plugin:2.8:analyze-duplicate (default) @ giraph-parent ---
[INFO] Skipping plugin execution
[INFO]
[INFO] --- maven-dependency-plugin:2.8:analyze-dep-mgt (default) @ giraph-parent ---
[INFO] Skipping plugin execution
[INFO]
[INFO] --- maven-duplicate-finder-plugin:1.0.4:check (default) @ giraph-parent ---
[INFO]
[INFO] --- maven-site-plugin:3.3:attach-descriptor (attach-descriptor) @ giraph-parent ---
[INFO]
[INFO] --- maven-install-plugin:2.3.1:install (default-install) @ giraph-parent ---
[INFO] Installing /usr/local/giraph/pom.xml to /home/hadoopuser/.m2/repository/org/apache/giraph/giraph-parent/1.1.0/giraph-parent-1.1.0.pom
[INFO] Installing /usr/local/giraph/target/giraph-parent-1.1.0-site.xml to /home/hadoopuser/.m2/repository/org/apache/giraph/giraph-parent/1.1.0/giraph-parent-1.1.0-site.xml
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Apache Giraph Core 1.1.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- mavanagaiata:0.5.0:branch (git-commit) @ giraph-core ---
[INFO]
[INFO] --- mavanagaiata:0.5.0:commit (git-commit) @ giraph-core ---
[INFO]
[INFO] --- maven-enforcer-plugin:1.2:enforce (default) @ giraph-core ---
[INFO] Skipping Rule Enforcement.
[INFO]
[INFO] --- maven-dependency-versions-check-plugin:2.0.2:check (default) @ giraph-core ---
[INFO]
[INFO] --- munge-maven-plugin:1.0:munge (munge) @ giraph-core ---
[INFO]
[INFO] --- maven-remote-resources-plugin:1.4:process (default) @ giraph-core ---
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ giraph-core ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 2 resources
[INFO] Copying 3 resources
[INFO]
[INFO] --- maven-compiler-plugin:3.0:compile (default-compile) @ giraph-core ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 711 source files to /usr/local/giraph/giraph-core/target/munged/classes
[INFO] -------------------------------------------------------------
[WARNING] COMPILATION WARNING :
[INFO] -------------------------------------------------------------
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/UnsafeByteArrayOutputStream.java:[42,29] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/UnsafeByteArrayOutputStream.java:[44,25] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/UnsafeByteArrayOutputStream.java:[57,32] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/UnsafeArrayReads.java:[39,32] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/UnsafeArrayReads.java:[42,29] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/UnsafeArrayReads.java:[44,25] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/DistributedCacheUtils.java: Some input files use or override a deprecated API.
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/DistributedCacheUtils.java: Recompile with -Xlint:deprecation for details.
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/TestGraph.java: Some input files use unchecked or unsafe operations.
[WARNING] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/utils/TestGraph.java: Recompile with -Xlint:unchecked for details.
[INFO] 10 warnings
[INFO] -------------------------------------------------------------
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/comm/netty/SaslNettyClient.java:[84,68] cannot find symbol
symbol: variable SASL_PROPS
location: class org.apache.hadoop.security.SaslRpcServer
[ERROR] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/comm/netty/SaslNettyServer.java:[105,62] cannot find symbol
symbol: variable SASL_PROPS
location: class org.apache.hadoop.security.SaslRpcServer
[INFO] 2 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] Apache Giraph Parent ............................... SUCCESS [ 4.360 s]
[INFO] Apache Giraph Core ................................. FAILURE [ 7.473 s]
[INFO] Apache Giraph Examples ............................. SKIPPED
[INFO] Apache Giraph Distribution ......................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 12.122 s
[INFO] Finished at: 2015-11-16T10:26:04+05:30
[INFO] Final Memory: 46M/374M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.0:compile (default-compile) on project giraph-core: Compilation failure: Compilation failure:
[ERROR] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/comm/netty/SaslNettyClient.java:[84,68] cannot find symbol
[ERROR] symbol: variable SASL_PROPS
[ERROR] location: class org.apache.hadoop.security.SaslRpcServer
[ERROR] /usr/local/giraph/giraph-core/target/munged/main/org/apache/giraph/comm/netty/SaslNettyServer.java:[105,62] cannot find symbol
[ERROR] symbol: variable SASL_PROPS
[ERROR] location: class org.apache.hadoop.security.SaslRpcServer
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn <goals> -rf :giraph-core
---
Version information follows,
Hadoop:
hadoopuser:~$ hadoop version
Hadoop 2.7.1
Subversion https://git-wip-us.apache.org/repos/asf/hadoop.git -r 15ecc87ccf4a0228f35af08fc56de536e6ce657a
Compiled by jenkins on 2015-06-29T06:04Z
Compiled with protoc 2.5.0
From source with checksum fc0a1a23fc1868e4d5ee7fa2b28a58a
This command was run using /usr/local/hadoop/share/hadoop/common/hadoop-common-2.7.1.jar
Giraph is version 1.1.0 downloaded from here : http://archive.apache.org/dist/giraph/giraph-1.1.0/giraph-dist-1.1.0-src.tar.bz2
Java
hadoopuser:~$ java -version
java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)
Maven
hadoopuser:~$ mvn -version
Apache Maven 3.3.3 (7994120775791599e205a5524ec3e0dfe41d4a06; 2015-04-22T17:27:37+05:30)
Maven home: /opt/apache-maven-3.3.3
Java version: 1.8.0_05, vendor: Oracle Corporation
Java home: /usr/lib/jvm/jdk1.8.0/jre
Default locale: en_IN, platform encoding: UTF-8
OS name: "linux", version: "3.13.0-68-generic", arch: "amd64", family: "unix"
正如 Steve Kaeser 在他的 answer 中所建议的那样我更改了 pom.xlm,更改部分如下所示。
<properties>
<hadoop.version>SET_HADOOP_VERSION_USING_MVN_DASH_D_OPTION</hadoop.version>
<munge.symbols>PURE_YARN</munge.symbols>
<!-- TODO: add these checks eventually -->
<project.enforcer.skip>true</project.enforcer.skip>
<giraph.maven.dependency.plugin.skip>true</giraph.maven.dependency.plugin.skip>
<giraph.maven.duplicate.finder.skip>true</giraph.maven.duplicate.finder.skip>
</properties>
执行此操作后,当我运行 mvn -Phadoop_yarn -Dhadoop.version=2.7.1 -DskipTests install 时,我得到了很多输出,但它失败了。部分输出如下所示,
[INFO]
[INFO] --- apache-rat-plugin:0.8:check (default) @ giraph-core ---
[INFO] Exclude: CODE_CONVENTIONS
[INFO] Exclude: **/target/**
[INFO] Exclude: /_bsp/**
[INFO] Exclude: .checkstyle
[INFO] Exclude: .reviewboardrc
[INFO] Exclude: .git/**
[INFO] Exclude: .gitignore
[INFO] Exclude: .arcconfig
[INFO] Exclude: *.patch
[INFO] Exclude: .idea/**
[INFO] Exclude: **/*.iml
[INFO] Exclude: **/*.ipr
[INFO] Exclude: **/test/resources/**
[INFO] Exclude: giraph-gora/conf/*
[INFO] Exclude: giraph-rexster/giraph-kibble/src/main/resources/META-INF/services/com.tinkerpop.rexster.extension.RexsterExtension
[INFO] Exclude: src/site/resources/images/*.svg
[INFO]
[INFO] >>> findbugs-maven-plugin:2.5.1:check (default) > :findbugs @ giraph-core >>>
[INFO]
[INFO] --- findbugs-maven-plugin:2.5.1:findbugs (findbugs) @ giraph-core ---
[INFO] Fork Value is true
[java] The following errors occurred during analysis:
[java] Nov 17, 2015 3:16:36 PM edu.umd.cs.findbugs.TextUIBugReporter reportAnalysisError
[java] SEVERE: Error scanning java/util/Comparator for referenced classes
[java] java.lang.ArrayIndexOutOfBoundsException: 51966
[java] at org.objectweb.asm.ClassReader.readUTF8(Unknown Source)
[java] at org.objectweb.asm.ClassReader.readClass(Unknown Source)
.
.
.
.
.
.
.
.
[INFO] Reactor Summary:
[INFO]
[INFO] Apache Giraph Parent ............................... SUCCESS [ 4.140 s]
[INFO] Apache Giraph Core ................................. FAILURE [ 37.541 s]
[INFO] Apache Giraph Examples ............................. SKIPPED
[INFO] Apache Giraph Distribution ......................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 41.972 s
[INFO] Finished at: 2015-11-17T15:16:37+05:30
[INFO] Final Memory: 68M/537M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:findbugs-maven-plugin:2.5.1:findbugs (findbugs) on project giraph-core: Execution findbugs of goal org.codehaus.mojo:findbugs-maven-plugin:2.5.1:findbugs failed: Java returned: 1 -> [Help 1]
[ERROR]
最佳答案
我今天遇到了这个问题。最后我需要两个补丁来修复它:
打开基本目录中的 pom.xml 并替换
<munge.symbols>PURE_YARN,STATIC_SASL_SYMBOL</munge.symbols>与:
<munge.symbols>PURE_YARN</munge.symbols>
应用在此处找到的补丁:GIRAPH-1110.02.patch
使用 clean 构建Maven 标志:
mvn -Phadoop_yarn -Dhadoop.version=2.7.3 clean package -DskipTests
关于java - 使用 Hadoop 构建 Giraph,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33728752/
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假设我做了一个模块如下:m=Module.newdoclassCendend三个问题:除了对m的引用之外,还有什么方法可以访问C和m中的其他内容?我可以在创建匿名模块后为其命名吗(就像我输入“module...”一样)?如何在使用完匿名模块后将其删除,使其定义的常量不再存在? 最佳答案 三个答案:是的,使用ObjectSpace.此代码使c引用你的类(class)C不引用m:c=nilObjectSpace.each_object{|obj|c=objif(Class===objandobj.name=~/::C$/)}当然这取决于
我正在尝试使用ruby和Savon来使用网络服务。测试服务为http://www.webservicex.net/WS/WSDetails.aspx?WSID=9&CATID=2require'rubygems'require'savon'client=Savon::Client.new"http://www.webservicex.net/stockquote.asmx?WSDL"client.get_quotedo|soap|soap.body={:symbol=>"AAPL"}end返回SOAP异常。检查soap信封,在我看来soap请求没有正确的命名空间。任何人都可以建议我
关闭。这个问题是opinion-based.它目前不接受答案。想要改进这个问题?更新问题,以便editingthispost可以用事实和引用来回答它.关闭4年前。Improvethisquestion我想在固定时间创建一系列低音和高音调的哔哔声。例如:在150毫秒时发出高音调的蜂鸣声在151毫秒时发出低音调的蜂鸣声200毫秒时发出低音调的蜂鸣声250毫秒的高音调蜂鸣声有没有办法在Ruby或Python中做到这一点?我真的不在乎输出编码是什么(.wav、.mp3、.ogg等等),但我确实想创建一个输出文件。
我在我的项目目录中完成了compasscreate.和compassinitrails。几个问题:我已将我的.sass文件放在public/stylesheets中。这是放置它们的正确位置吗?当我运行compasswatch时,它不会自动编译这些.sass文件。我必须手动指定文件:compasswatchpublic/stylesheets/myfile.sass等。如何让它自动运行?文件ie.css、print.css和screen.css已放在stylesheets/compiled。如何在编译后不让它们重新出现的情况下删除它们?我自己编译的.sass文件编译成compiled/t
我想将html转换为纯文本。不过,我不想只删除标签,我想智能地保留尽可能多的格式。为插入换行符标签,检测段落并格式化它们等。输入非常简单,通常是格式良好的html(不是整个文档,只是一堆内容,通常没有anchor或图像)。我可以将几个正则表达式放在一起,让我达到80%,但我认为可能有一些现有的解决方案更智能。 最佳答案 首先,不要尝试为此使用正则表达式。很有可能你会想出一个脆弱/脆弱的解决方案,它会随着HTML的变化而崩溃,或者很难管理和维护。您可以使用Nokogiri快速解析HTML并提取文本:require'nokogiri'h
我想为Heroku构建一个Rails3应用程序。他们使用Postgres作为他们的数据库,所以我通过MacPorts安装了postgres9.0。现在我需要一个postgresgem并且共识是出于性能原因你想要pggem。但是我对我得到的错误感到非常困惑当我尝试在rvm下通过geminstall安装pg时。我已经非常明确地指定了所有postgres目录的位置可以找到但仍然无法完成安装:$envARCHFLAGS='-archx86_64'geminstallpg--\--with-pg-config=/opt/local/var/db/postgresql90/defaultdb/po