上篇博客说了下mahout的phase参数的含义,但是没有涉及到具体的应用,上次也只是说了一下这两个参数,startPhase和endPhase的好处:当运行RecommenderJob时前面的两个phase都运行成功了,但是后面的运行出错,那么是否要继续从第一个phase开始运行呢,其实完全没有必要,可以设置startPhase和endPhase这两个参数,直接跳过前面两个Phase。的确是,这个就是它的用处吧(或许还有其他用处?)下面就针对RecommenderJob来进行分析吧
看下图:
这个图针对RecommenderJob进行了分析,第二行的1,2,。。表示当前的Phase包含的MR数量;第三行是每个Phase运行后产生的文件及文件目录。下面说下我的跳过Phase的想法:由上面的图可以看出,每个Phase的输出目录文件是不一样的,所以我采用的做法是运行一遍RecommenderJob,如果有错,那么就去检测每个Phase的输出目录,如果里面有文件,那么就说明这个Phase是正常运行的,反之亦然;
下面上代码:
PhaseUtils.java:
package org.fansy.date1203.mahout.phase; import java.io.IOException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.apache.mahout.common.HadoopUtil; public class PhaseUtils { /* * 常量 */ public static final String TEMP_PATH="hdfs://fansypc:9000/user/botwave/"; public static final String TEMP=System.currentTimeMillis()+"/cf/"; public static final String CF_TEMP_DIR=TEMP_PATH+TEMP; /* * files should be checked in phase one */ public static final String PHASE_ONE_1=CF_TEMP_DIR+"/"+"preparePreforenceMatrix/itemIDIndex/part-r-00000"; public static final String PHASE_ONE_2=CF_TEMP_DIR+"/"+"preparePreforenceMatrix/numUsers.bin"; public static final String PHASE_ONE_3=CF_TEMP_DIR+"/"+"preparePreforenceMatrix/ratingMatrix/part-r-00000"; public static final String PHASE_ONE_4=CF_TEMP_DIR+"/"+"preparePreforenceMatrix/userVectors/part-r-00000"; /* * files should be deleted in phase one */ public static final String PHASE_ONE_1_D=CF_TEMP_DIR+"/"+"preparePreforenceMatrix/itemIDIndex/_SUCCESS"; public static final String PHASE_ONE_2_D=CF_TEMP_DIR+"/"+"preparePreforenceMatrix/ratingMatrix/_SUCCESS"; public static final String PHASE_ONE_3_D=CF_TEMP_DIR+"/"+"preparePreforenceMatrix/userVectors/_SUCCESS"; /* * files should be checked in phase two */ public static final String PHASE_TWO_1=CF_TEMP_DIR+"/"+"paiwiseSimilarity/part-r-00000"; public static final String PHASE_TWO_2=CF_TEMP_DIR+"/"+"maxValues.bin"; public static final String PHASE_TWO_3=CF_TEMP_DIR+"/"+"normas.bin"; public static final String PHASE_TWO_4=CF_TEMP_DIR+"/"+"numNonZeroEntries.bin"; public static final String PHASE_TWO_5=CF_TEMP_DIR+"/"+"similarityMatrix/part-r-00000"; public static final String PHASE_TWO_6=CF_TEMP_DIR+"/"+"weights/part-r-00000"; /* * files should be delete in phase two */ public static final String PHASE_TWO_1_D=CF_TEMP_DIR+"/"+"similarityMatrix/_SUCCESS"; public static final String PHASE_TWO_2_D=CF_TEMP_DIR+"/"+"weights/_SUCCESS"; public static final String PHASE_TWO_3_D=CF_TEMP_DIR+"/"+"paiwiseSimilarity/_SUCCESS"; /* * files should be checked in phase three */ public static final String PHASE_THREE_1=CF_TEMP_DIR+"/"+"partialMultiply/part-r-00000"; public static final String PHASE_THREE_2=CF_TEMP_DIR+"/"+"partialMultiply1/part-r-00000"; public static final String PHASE_THREE_3=CF_TEMP_DIR+"/"+"partialMultiply2/part-r-00000"; /* * files should be deleted in phase three */ public static final String PHASE_THREE_1_D=CF_TEMP_DIR+"/"+"partialMultiply/_SUCCESS"; public static final String PHASE_THREE_2_D=CF_TEMP_DIR+"/"+"partialMultiply1/_SUCCESS"; public static final String PHASE_THREE_3_D=CF_TEMP_DIR+"/"+"partialMultiply2/_SUCCESS"; /* * 查看文件是否存在 */ public static boolean fileExists(String file){ boolean flag=false; Configuration conf=new Configuration(); Path path=new Path(file); FileSystem fs=null; try { fs=FileSystem.get(path.toUri(), conf); } catch (IOException e) { e.printStackTrace(); } try { flag=fs.exists(path); } catch (IOException e) { e.printStackTrace(); } return flag; } /* * 删除文件 */ public static boolean deleteFile(String file){ boolean flag=true; try { HadoopUtil.delete(new Configuration(), new Path(file)); } catch (IOException e) { // TODO Auto-generated catch block flag=false; e.printStackTrace(); } return flag; } /* * check files in phase one */ public static boolean checkFilesInPhaseOne(){ int temp=0; if(fileExists(PHASE_ONE_1)){ temp++; } if(fileExists(PHASE_ONE_2)){ temp++; } if(fileExists(PHASE_ONE_3)){ temp++; } if(fileExists(PHASE_ONE_4)){ temp++; } if(temp==4){ return true; }else{ return false; } } /* * delete files in phase one */ public static void deleteFilesInPhaseOne(){ deleteFile(PHASE_ONE_1_D); deleteFile(PHASE_ONE_2_D); deleteFile(PHASE_ONE_3_D); } /* * check files in phase two */ public static boolean checkFilesInPhaseTwo(){ int temp=0; if(fileExists(PHASE_TWO_1)){ temp++; } if(fileExists(PHASE_TWO_2)){ temp++; } if(fileExists(PHASE_TWO_3)){ temp++; } if(fileExists(PHASE_TWO_4)){ temp++; } if(fileExists(PHASE_TWO_5)){ temp++; } if(fileExists(PHASE_TWO_6)){ temp++; } if(temp==6){ return true; }else{ return false; } } /* * delete files in phase two */ public static void deleteFilesInPhaseTwo(){ deleteFile(PHASE_TWO_1_D); deleteFile(PHASE_TWO_2_D); deleteFile(PHASE_TWO_3_D); } /* * check files in phase three */ public static boolean checkFilesInPhaseThree(){ int temp=0; if(fileExists(PHASE_THREE_1)){ temp++; } if(fileExists(PHASE_THREE_2)){ temp++; } if(fileExists(PHASE_THREE_3)){ temp++; } if(temp==3){ return true; }else{ return false; } } /* * delete files in phase three */ public static void deleteFilesInPhaseThree(){ deleteFile(PHASE_THREE_1_D); deleteFile(PHASE_THREE_3_D); deleteFile(PHASE_THREE_3_D); } }PhaseCheckDriver.java:
package org.fansy.date1203.mahout.phase; import static org.fansy.date1203.mahout.phase.PhaseUtils.*; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.util.ToolRunner; import org.apache.mahout.cf.taste.hadoop.item.RecommenderJob; public class PhaseCheckDriver { /** * 原地运行任务 * @throws Exception */ public static void main(String[] args) throws Exception { if(args.length!=2){ System.out.print("Usage: <input><output>"); System.exit(-1); } String arg="--input "+TEMP_PATH+args[0]+" --output "+TEMP_PATH+args[1]+ " --booleanData false --similarityClassname SIMILARITY_COOCCURRENCE "+ "--startPhase 0 --tempDir "+CF_TEMP_DIR; String[] tempArg=arg.split(" "); int temp=ToolRunner.run(new Configuration(), new RecommenderJob(),tempArg); if(temp==0){ System.exit(0); // 程序正常退出 } int times=3; // 继续运行任务三次,然后退出 boolean flag_phase1=false; boolean flag_phase2=false; boolean flag_phase3=false; boolean flag_phase4=false; int startPhase=0; while(times-->=0){ flag_phase1=PhaseUtils.checkFilesInPhaseOne(); if(flag_phase1){ flag_phase2=PhaseUtils.checkFilesInPhaseTwo(); startPhase++; } if(flag_phase2){ flag_phase3=PhaseUtils.checkFilesInPhaseThree(); startPhase++; } if(flag_phase3){ flag_phase4=PhaseUtils.fileExists(TEMP_PATH+args[1]); startPhase++; } if(flag_phase4){ startPhase++; } if(startPhase>=4){ break; // 说明4个phase运行成功,退出程序 } // 否则的话,删除_SUCCESS文件,调整参数继续运行 switch(startPhase){ case 1: PhaseUtils.deleteFilesInPhaseOne(); break; case 2: PhaseUtils.deleteFilesInPhaseOne(); PhaseUtils.deleteFilesInPhaseTwo(); break; case 3: PhaseUtils.deleteFilesInPhaseOne(); PhaseUtils.deleteFilesInPhaseTwo(); break; } // arg="--input "+TEMP_PATH+args[0]+" --output "+TEMP_PATH+args[1]+ " --booleanData false --similarityClassname SIMILARITY_COOCCURRENCE "+ "--startPhase "+startPhase+" --tempDir "+CF_TEMP_DIR; temp=ToolRunner.run(new Configuration(), new RecommenderJob(),tempArg); if(temp==0){ System.exit(0); // 程序正常退出 } } } }说明:上面的代码中的删除_SUCCESS文件是必须的,这个和我的测试方法有关,先说下我的测试方法吧。
我先运行了一遍RecommenderJob(操作A),然后屏蔽PhaseCheckDriver里面的第一个RecommenderJob,同时删除操作A的phase2产生的文件,然后运行PhaseCheckDriver,看是否有跳过并且是否出来最后的结果;
因为操作A 是成功的,所以在每个目录里会有_SUCCESS文件,当有这个文件的时候,直接使用startPhase=1跳过第phase0会显示出错,所以我在程序里面用代码删除了这个文件。
注: 上面的代码还未测试过;
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