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Mck SembWever commented on CASSANDRA-3136: ------------------------------------------ Ok... it was mentioned in CASSANDRA-2388 (by Patrik Modesto). but no one there paid it any attention as it didn't belong to that issue. > Allow CFIF to keep going despite unavailable ranges > --------------------------------------------------- > > Key: CASSANDRA-3136 > URL: https://issues.apache.org/jira/browse/CASSANDRA-3136 > Project: Cassandra > Issue Type: Improvement > Components: Hadoop > Reporter: Mck SembWever > Priority: Minor > > From http://thread.gmane.org/gmane.comp.db.cassandra.user/18902 > <use-case-1 from="Patrik Modesto"> > We use Cassandra as a storage for web-pages, we store the HTML, all > URLs that has the same HTML data and some computed data. We run Hadoop > MR jobs to compute lexical and thematical data for each page and for > exporting the data to a binary files for later use. URL gets to a > Cassandra on user request (a pageview) so if we delete an URL, it gets > back quickly if the page is active. Because of that and because there > is lots of data, we have the keyspace set to RF=1. We can drop the > whole keyspace and it will regenerate quickly and would contain only > fresh data, so we don't care about lossing a node. > </use-case-1> > <use-case-2> > trying to extract a small random sample (like a pig SAMPLE) of data out of > cassandra. > </use-case-2> > <use-case-3> > searching for something or some-pattern and one hit > is enough. If you get the hit it's a positive result regardless if > ranges were ignored, if you don't and you *know* there was a range > ignored along the way you can re-run the job later. > For example such a job could be run at regular intervals in the day until a > hit was found. > </use-case-3> -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira