The funny thing is that there's no delete's issued... Can I still get Tombstone objects?
On Tue, Sep 3, 2013 at 4:30 PM, Jeremiah Peschka <[email protected] > wrote: > TL;DR: Distributed databases are spooky, your app must account for > entertaining side effects like you described. > > Long form: > > There is some window of time between issuing a delete, Riak writing the > initial tombstone, and then Riak deleting the underlying data from disk [1]. > > In any situation where you're querying for data and there's a chance it > could go away, you need to make sure that you're double checking that the > data is present and that you're accounting for failures. > > Secondary indexes ($bucket included) perform a coverage query. That is - > when you query an index, Riak will not read from R partitions (notice that > you can't set an R-value for index reads?), instead it reads from enough > partitions to get 1 copy of the data. See [2] for more details on coverage > queries. > > In theory, you could be reading rows from a node before the delete has > been replicated or between the tombstoning and reclamation of the object. > > [1]: > http://lists.basho.com/pipermail/riak-users_lists.basho.com/2011-October/006048.html > [2]: > http://lists.basho.com/pipermail/riak-users_lists.basho.com/2011-October/006237.html > > > > --- > Jeremiah Peschka - Founder, Brent Ozar Unlimited > MCITP: SQL Server 2008, MVP > Cloudera Certified Developer for Apache Hadoop > > > On Fri, Aug 30, 2013 at 5:54 AM, Anders Hedström < > [email protected]> wrote: > >> Hello, >> >> I've got a riak cluster with 3 nodes. >> >> I use the $bucket index to get all keys for a bucket. Then I loop thru >> the returned list and try to fetch each object for each key. For some keys >> that was returned I get a 404 back when trying to fetch the object... How >> is this possible? What can have gone wrong? I've got no clue... When the >> $bucket index returns a key I expect it to exist. >> >> I appreciate any response... >> >> Cheers >> //Anders >> >> >> _______________________________________________ >> riak-users mailing list >> [email protected] >> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com >> >> > -- ------------------------------------------------- LinkedIn: http://www.linkedin.com/in/andershedstrom GTalk: [email protected] Skype: anders.hedstrom
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