GPS-Graph Processing System 改动源代码经验总结 （四）

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本文目的：在改动GPS源代码后，具体描写叙述怎样编译和分发到各Worker节点上。

以下以Graph Coloring 算法为例进行解说。本文基于GPS的前三篇文章。

1. 首先在Master(test150)上改动源代码。

Graph Coloring算法源代码路径：gps.examples.coloring包，主要改动ColoringVertex.java类。

该算法在Selection（MIS_1）阶段是依照顶点的出度大小概率性的选择UNDECIDED状态的顶点，源代码例如以下：

if (ColoringVertexType.NOT_IN_SET == value.type
	|| ColoringVertexType.IN_SET == value.type) {
	return;
}
double probability = getNeighborsSize() > 0 ? 1.0 /
    ((double) 2*value.numRemainingNeighbors) : 1;
if (Math.random() <= probability) {
	value.type = ColoringVertexType.SELECTED_AS_POSSIBLE_IN_SET;
	if (value.numRemainingNeighbors > 0) {
	ColoringMessage newSelectedAsPossibleMessage = ColoringMessage
			.newNeighborSelectedAsPossibleMessage(getId());
		for (int neighborId : getNeighborIds()) {
			if (neighborId >= 0) {
				sendMessage(neighborId, newSelectedAsPossibleMessage);
			}
		}
	}
}

以下改动为：选择全部的UNDECIDED状态的顶点，而非概率性选择。

改动后源代码例如以下：

if (ColoringVertexType.NOT_IN_SET == value.type
	|| ColoringVertexType.IN_SET == value.type) {
	return;
}
//double probability = getNeighborsSize() > 0 ?
 
1.0 /
//   ((double) 2*value.numRemainingNeighbors) : 1;
//if (Math.random() <= probability) {
//	value.type = ColoringVertexType.SELECTED_AS_POSSIBLE_IN_SET;
	if (value.numRemainingNeighbors > 0) {
	ColoringMessage newSelectedAsPossibleMessage = ColoringMessage
			.newNeighborSelectedAsPossibleMessage(getId());
		for (int neighborId : getNeighborIds()) {
			if (neighborId >= 0) {
				sendMessage(neighborId, newSelectedAsPossibleMessage);
			}
		}
	}
//}

2. 由于之前已编译过GPS源代码，而且把Jar包等文件已分发到集群中各个Worker节点上，所以此步骤是删除之前的文件。删除Master节点trunk文件夹下的：gps-0.0.1-slave.tar.gz 、gps_node_runner.jar和classes文件夹，删除Worker节点trunk文件夹下的 conf 、gps-0.0.1-slave.tar.gz 、gps_node_runner.jar 、libs  、scripts。logs文件夹保留。

3. 參考 GPS-Graph Processing System集群安装笔记（一），又一次编译和分发Jar包等文件。

以下附上我的脚本。因中间使用了我自己的脚本，故不可直接使用，可是能够參考。脚本所在文件夹：/home/gougou/GPS/trunk。

cd /home/gougou/GPS/trunk
# delete master files
rm -rf gps_node_runner.jar
rm -rf classes
rm -rf  gps-0.0.1-slave.tar.gz
 
# delete worker files. the Shell writed by myself.
cd /home/gougou/ShellUtils
./deleteDirectory.sh /home/gougou/GPS/trunk/conf
./deleteDirectory.sh /home/gougou/GPS/trunk/gps-0.0.1-slave.tar.gz
./deleteDirectory.sh /home/gougou/GPS/trunk/gps_node_runner.jar
./deleteDirectory.sh /home/gougou/GPS/trunk/libs
./deleteDirectory.sh /home/gougou/GPS/trunk/scripts/
 
# compile GPS source code
cd /home/gougou/GPS/trunk
cd local-master-scripts
# generate gps_node_runner.jar and classes under trunk directory
./make_gps_node_runner_jar.sh
# generate  gps-0.0.1-slave.tar.gz under trunk directory
./make_gps_tar_gz.sh
 
cd ../master-scripts
cp slaves temp
cp slaves-12 slaves
./copy_and_untar_gps_tar_to_slaves.sh 12
mv temp slaves

4. 在trunk/master-scripts文件夹下，执行Graph Coloring 算法，命令例如以下：

./start_gps_nodes.sh 2 GC-Test5-1 \
"-ifs /user/gougou/GC-Test5/gc-5.txt \
-hcf /home/gougou/hadoop-1.0.3/conf/core-site.xml \
-jc gps.examples.coloring.JobConfiguration \
-mcfg /machine-configs/test_machine_config_2.cfg \
-log4jconfig /home/gougou/GPS/trunk/conf/log4j.config"

完！