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我正在使用Nutch 2.1爬行整个域名（例如company.com）。我曾遇到过这个问题，由于Apache Nutch中设置的内容限制，我没有收到我想要爬取的所有链接。通常，当我检查内容时，只有页面的上半部分存储在数据库中，因此下半部分的链接没有被抓取。使用Nutch内容限制的建议
为了解决这个问题，我改变了的Nutch-site.xml中使内容限制如下：
<property>
<name>http.content.limit</name>
<value>-1</value>
<description>The length limit for downloaded content using the http
protocol, in bytes. If this value is nonnegative (>=0), content longer
than it will be truncated; otherwise, no truncation at all. Do not
confuse this setting with the file.content.limit setting.
</description>
</property>
这样做解决了这个问题，但在某些时候，我遇到了内存溢出错误，由该输出在分析证明：
ParserJob: starting
ParserJob: resuming: false
ParserJob: forced reparse: false
ParserJob: parsing all
Exception in thread "main" java.lang.RuntimeException: job failed: name=parse, jobid=job_local_0001
at org.apache.nutch.util.NutchJob.waitForCompletion(NutchJob.java:54)
at org.apache.nutch.parse.ParserJob.run(ParserJob.java:251)
at org.apache.nutch.parse.ParserJob.parse(ParserJob.java:259)
at org.apache.nutch.parse.ParserJob.run(ParserJob.java:302)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.nutch.parse.ParserJob.main(ParserJob.java:306)
这里是我的hadoop.log（错误附近的部分） ：
2016-01-22 02:02:35,898 INFO crawl.SignatureFactory - Using Signature impl: org.apache.nutch.crawl.MD5Signature
2016-01-22 02:02:37,255 WARN util.NativeCodeLoader - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
2016-01-22 02:02:39,130 INFO mapreduce.GoraRecordReader - gora.buffer.read.limit = 10000
2016-01-22 02:02:39,255 INFO mapreduce.GoraRecordWriter - gora.buffer.write.limit = 10000
2016-01-22 02:02:39,322 INFO crawl.SignatureFactory - Using Signature impl: org.apache.nutch.crawl.MD5Signature
2016-01-22 02:02:53,018 WARN mapred.FileOutputCommitter - Output path is null in cleanup
2016-01-22 02:02:53,031 WARN mapred.LocalJobRunner - job_local_0001
java.lang.OutOfMemoryError: Java heap space
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3051)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2991)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3532)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:943)
at com.mysql.jdbc.MysqlIO.nextRow(MysqlIO.java:1441)
at com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:2936)
at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:477)
at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:2631)
at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1800)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2221)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2127)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2293)
at org.apache.gora.sql.store.SqlStore.execute(SqlStore.java:423)
at org.apache.gora.query.impl.QueryBase.execute(QueryBase.java:71)
at org.apache.gora.mapreduce.GoraRecordReader.executeQuery(GoraRecordReader.java:66)
at org.apache.gora.mapreduce.GoraRecordReader.nextKeyValue(GoraRecordReader.java:102)
at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:532)
at org.apache.hadoop.mapreduce.MapContext.nextKeyValue(MapContext.java:67)
at org.apache.hadoop.map
当我将内容限制设置为-1时，我只遇到了这个问题。但是，如果我不这样做，有可能我无法获得我想要的所有链接。有关如何使用内容限制的任何建议？这样做不是很明智吗？如果是这样，我可以使用什么样的替代方案？谢谢！
你为什么不增加内存，看看它是如何工作的？ – ameertawfik
有没有办法让Nutch增加内存？ – dagitab