【原创】Mac上编译Hadoop1.0.3出现的一些问题

create-native-configure:
     [exec] configure.ac:47: error: possibly undefined macro: AC_PROG_LIBTOOL
     [exec]       If this token and others are legitimate, please use m4_pattern_allow.
     [exec]       See the Autoconf documentation.
     [exec] autoreconf: /usr/local/Cellar/autoconf/2.69/bin/autoconf failed with exit status: 1

BUILD FAILED
/Users/lili/快盘/hadoop-1.0.3/build.xml:618: exec returned: 1

用ant编译至此出现报错，然后安装个libtool问题就解决了，brew install libtool，这个问题应该只在Mac下出现，可能是系统的原因。接下来解决了这个问题，还出现了个奇葩的问题。

compile:
     [echo] contrib: gridmix
    [javac] /Users/lili/快盘/hadoop-1.0.3/src/contrib/build-contrib.xml:185: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
    [javac] Compiling 31 source files to /Users/lili/快盘/hadoop-1.0.3/build/contrib/gridmix/classes
    [javac] /Users/lili/快盘/hadoop-1.0.3/src/contrib/gridmix/src/java/org/apache/hadoop/mapred/gridmix/Gridmix.java:396: 错误: 类型参数? extends T不在类型变量E的范围内
    [javac]   private <T> String getEnumValues(Enum<? extends T>[] e) {
    [javac]                                         ^
    [javac]   其中, T,E是类型变量:
    [javac]     T扩展已在方法 <T>getEnumValues(Enum<? extends T>[])中声明的Object
    [javac]     E扩展已在类 Enum中声明的Enum<E>
    [javac] /Users/lili/快盘/hadoop-1.0.3/src/contrib/gridmix/src/java/org/apache/hadoop/mapred/gridmix/Gridmix.java:399: 错误: 类型参数? extends T不在类型变量E的范围内
    [javac]     for (Enum<? extends T> v : e) {
    [javac]               ^
    [javac]   其中, T,E是类型变量:
    [javac]     T扩展已在方法 <T>getEnumValues(Enum<? extends T>[])中声明的Object
    [javac]     E扩展已在类 Enum中声明的Enum<E>
    [javac] 注: 某些输入文件使用了未经检查或不安全的操作。
    [javac] 注: 有关详细信息, 请使用 -Xlint:unchecked 重新编译。
    [javac] 2 个错误

这个问题是这个版本的个BUG，解决方法如下：

Index: src/contrib/gridmix/src/java/org/apache/hadoop/mapred/gridmix/Gridmix.java
===================================================================
--- src/contrib/gridmix/src/java/org/apache/hadoop/mapred/gridmix/Gridmix.java    (revision 1340233)
+++ src/contrib/gridmix/src/java/org/apache/hadoop/mapred/gridmix/Gridmix.java    (working copy)
@@ -613,10 +613,10 @@
     }
   }
 
-  private <T> String getEnumValues(Enum<? extends T>[] e) {
+  private String getEnumValues(Enum<?>[] e) {
     StringBuilder sb = new StringBuilder();
     String sep = "";
-    for (Enum<? extends T> v : e) {
+    for (Enum<?> v : e) {
       sb.append(sep);
       sb.append(v.name());
       sep = "|";