编译hadoop-2.4.0之HDFS的64位C++库

来源：互联网发布：maxwell软件原理编辑：程序博客网时间：2024/05/01 17:35

C++库的源代码位于：

hadoop-2.4.0-src/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs

这里提供一个直接对这些源文件进行编译的makefile，编译后将打包命名为libhdfs.a. makefile内容为：

CC            = gccDEFINES       = -DG_ARCH_X86_64CFLAGS        += -fPIC -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -pipe -O3 -D_REENTRANT $(DEFINES)CXXFLAGS      += -pipe -O3 -D_REENTRANT $(DEFINES) -rdynamicAR            = ar cqsLFLAGS        = -rdynamicOBJECTS       = exception.o expect.o hdfs.o jni_helper.o native_mini_dfs.oTARGET        = libhdfs.a#command, don't changeCHK_DIR_EXISTS= test -dDEL_FILE      = rm -ffirst: all####### Implicit rules.SUFFIXES: .o .c .cpp .cc .cxx .C .cu.cpp.o:$(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<".cc.o:$(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<".cxx.o:$(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<".C.o:$(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<".c.o:$(CC) -c $(CFLAGS) $(INCPATH) -o "$@" "$<"        ####### Build rules     all: $(AR)$(AR): $(TARGET)$(TARGET):  $(OBJECTS)$(AR) $(TARGET) $(OBJECTS)clean: -$(DEL_FILE) $(OBJECTS) $(TARGET)

保存好后，直接make. 编译信息如下：

gcc -c -fPIC -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -pipe -O3 -D_REENTRANT -DG_ARCH_X86_64  -o "exception.o" "exception.c"gcc -c -fPIC -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -pipe -O3 -D_REENTRANT -DG_ARCH_X86_64  -o "expect.o" "expect.c"gcc -c -fPIC -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -pipe -O3 -D_REENTRANT -DG_ARCH_X86_64  -o "hdfs.o" "hdfs.c"gcc -c -fPIC -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -pipe -O3 -D_REENTRANT -DG_ARCH_X86_64  -o "jni_helper.o" "jni_helper.c"gcc -c -fPIC -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -pipe -O3 -D_REENTRANT -DG_ARCH_X86_64  -o "native_mini_dfs.o" "native_mini_dfs.c"ar cqs libhdfs.a exception.o expect.o hdfs.o jni_helper.o native_mini_dfs.o

接下来测试一下这个库能不能用。进入以下目录

hadoop-2.4.0-src/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/test

找到测试源代码，对该文件夹中所有测试代码进行编译.这里再提供一个简单的makefile，内容如下：

LIBS = -L$(JAVA_HOME)/jre/lib/amd64/server/ -ljvm  -L../ -lhdfsINCPATH = -I$(JAVA_HOME)/include -I$(JAVA_HOME)/include/linux -I. -I..all:gcc -o hdfs_ops test_libhdfs_ops.c $(INCPATH) $(LIBS)gcc -o hdfs_read test_libhdfs_read.c $(INCPATH) $(LIBS)gcc -o hdfs_write test_libhdfs_write.c $(INCPATH) $(LIBS)gcc -o hdfs_zerocopy test_libhdfs_zerocopy.c $(INCPATH) $(LIBS)

直接make,编译信息如下：

gcc -o hdfs_ops test_libhdfs_ops.c -I/d0/data/lichao/software/java/jdk1.7.0_55/include -I/d0/data/lichao/software/java/jdk1.7.0_55/include/linux -I. -I.. -L/d0/data/lichao/software/java/jdk1.7.0_55/jre/lib/amd64/server/ -ljvm  -L../ -lhdfsgcc -o hdfs_read test_libhdfs_read.c -I/d0/data/lichao/software/java/jdk1.7.0_55/include -I/d0/data/lichao/software/java/jdk1.7.0_55/include/linux -I. -I.. -L/d0/data/lichao/software/java/jdk1.7.0_55/jre/lib/amd64/server/ -ljvm  -L../ -lhdfsgcc -o hdfs_write test_libhdfs_write.c -I/d0/data/lichao/software/java/jdk1.7.0_55/include -I/d0/data/lichao/software/java/jdk1.7.0_55/include/linux -I. -I.. -L/d0/data/lichao/software/java/jdk1.7.0_55/jre/lib/amd64/server/ -ljvm  -L../ -lhdfsgcc -o hdfs_zerocopy test_libhdfs_zerocopy.c -I/d0/data/lichao/software/java/jdk1.7.0_55/include -I/d0/data/lichao/software/java/jdk1.7.0_55/include/linux -I. -I.. -L/d0/data/lichao/software/java/jdk1.7.0_55/jre/lib/amd64/server/ -ljvm  -L../ -lhdfs

我们随便生成一个文件，包含1到10这10个数字，并加载到hdfs文件系统。

seq 1 10 >  tmpfilehadoop fs -mkdir /datahadoop fs -put tmpfile /datahadoop fs -cat /data/tmpfile12345678910

ok。现在运行生成的hdfs_read程序，测试一下hdfs的64位C++接口：

./hdfs_read /data/tmpfile 21 32

运行信息如下：

log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).log4j:WARN Please initialize the log4j system properly.log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.12345678910

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