[ https://issues.apache.org/jira/browse/NUTCH-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ferdy Galema updated NUTCH-1366: -------------------------------- Attachment: NUTCH-1366.patch > speed up indexing by eliminating the indexreducer > ------------------------------------------------- > > Key: NUTCH-1366 > URL: https://issues.apache.org/jira/browse/NUTCH-1366 > Project: Nutch > Issue Type: Improvement > Components: indexer > Reporter: Ferdy Galema > Fix For: nutchgora > > Attachments: NUTCH-1366.patch > > > Currently the indexer in Nutchgora consists of both mappers and reduces. But > the reduce code does not actually iterate over any (grouped/sorted) values. > It simply indexes individual key/value (String/Webpage) pairs. Therefore by > moving this indexing code to the mapper we can eliminate the reduce step > therefore making the indexing job much faster. (No more unnecessary spilling > to disk/network and no cpu wasted to sorting). > Note this is not (directly) applicable to trunk because trunk uses a quite > different approach. Different types of input are combined to a single value > in the reducer. Although I think it is possible to implement a similar > optimization I am not sure how to do this. So if anyone wants this for trunk > too feel free to implement a similar patch. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira