crawldb数据库内容得到更新

inject操作结果：crawldb数据库内容得到更新，包括URL及其状态。

看一下inject调用的函数：

public
voidinject(Path crawlDb, Path urlDir) throwsIOException {

//产生一个文件名是随机的临时文件夹

Path tempDir = newPath(getConf().get("mapred.temp.dir",
".")

+ "/inject-temp-"

+ Integer.toString(new

Random().nextInt(Integer.MAX_VALUE)));

// map text input file to a<url,CrawlDatum> file

// 产生<url,CrawlDatum>key-value对的文件

JobConf sortJob = newNutchJob(getConf());

sortJob.setJobName("inject" + urlDir);

FileInputFormat.addInputPath(sortJob,urlDir);

sortJob.setMapperClass(InjectMapper.class);

FileOutputFormat.setOutputPath(sortJob,tempDir);

sortJob.setOutputFormat(SequenceFileOutputFormat.class);

sortJob.setOutputKeyClass(Text.class);

sortJob.setOutputValueClass(CrawlDatum.class);

sortJob.setLong("injector.current.time",

System.currentTimeMillis());

JobClient.runJob(sortJob);

这里用的是hadoop的东西，输入文件目录为：用户指定的url目录。输出目录为：产生的那个临时文件夹。这里的SequenceFileOutputFormat在<Hadoop,The definitive book>中的解释为：Imagine a logfile,where each log

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时间： 2024-10-07 05:56:04

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