ScoringFilters是一个计算分数的类

//merge with existing crawl
db

JobConf mergeJob = CrawlDb.createJob(getConf(),crawlDb);

FileInputFormat.addInputPath(mergeJob,tempDir);

mergeJob.setReducerClass(InjectReducer.class);

JobClient.runJob(mergeJob);

CrawlDb.install(mergeJob, crawlDb);

// clean up

FileSystem fs = FileSystem.get(getConf());

fs.delete(tempDir, true);

if (LOG.isInfoEnabled()){

LOG.info("Injector:done");

}

}

mergeJob把刚才的临时目录当作输入目录，输出在install函数里处理，最终删除那个临时目录。下面看一下InjectReducer类：

/**Combine multiple new entries for a
url. */

public
static classInjectReducer
implements

Reducer<Text, CrawlDatum, Text,CrawlDatum> {

privateCrawlDatum
old = new CrawlDatum();

privateCrawlDatum
injected = newCrawlDatum();

public
voidreduce(Text key, Iterator<CrawlDatum> values,

OutputCollector<Text,CrawlDatum> output, Reporter reporter)

throwsIOException {

booleanoldSet =
false;

while(values.hasNext()) {

CrawlDatum val = values.next();

if(val.getStatus() == CrawlDatum.STATUS_INJECTED) {

injected.set(val);

injected.setStatus(CrawlDatum.STATUS_DB_UNFETCHED);

} else {

old.set(val);

oldSet = true;

}

}

CrawlDatum res = null;

if(oldSet)

res = old;
//don‘t overwrite existing value

else

res = injected;

output.collect(key, res);

}

}

这里reduce，<url,CrawlDatum>对，因为没有必要一个url关联着多个Datum，这里判断CrawlDatum的状态，如果它是STATUS_INJECTED，也就是新被注入的，设置injected值，如果是STATUS_DB_UNFETEDED，未被抓取的，就设置old的值。这里要注意的一点是如果的确是注入的过，就将res设为old，否则才设为injected。

在CrawlDb类的install中：

public
static voidinstall(JobConf job, Path crawlDb)
throwsIOException {

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时间： 2024-10-07 23:12:12

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