There is, but they aren't consulted on the streaming paths (only on normal reads)
-- Jeff Jirsa > On Sep 9, 2017, at 12:02 PM, DuyHai Doan <doanduy...@gmail.com> wrote: > > Jeff, > > With default compression enabled on each table, isn't there CRC files > created along side with SSTables that can help detecting bit-rot ? > > >> On Sat, Sep 9, 2017 at 7:50 PM, Jeff Jirsa <jji...@gmail.com> wrote: >> Cassandra doesn't do that automatically - it can guarantee consistency on >> read or write via ConsistencyLevel on each query, and it can run active >> (AntiEntropy) repairs. But active repairs must be scheduled (by human or >> cron or by third party script like http://cassandra-reaper.io/), and to be >> pedantic, repair only fixes consistency issue, there's some work to be done >> to properly address/support fixing corrupted replicas (for example, repair >> COULD send a bit flip from one node to all of the others) >> >> >> >> -- >> Jeff Jirsa >> >> >>> On Sep 9, 2017, at 1:07 AM, Ralph Soika <ralph.so...@imixs.com> wrote: >>> >>> Hi, >>> >>> I am searching for a big data storage solution for the Imixs-Workflow >>> project. I started with Hadoop until I became aware of the >>> 'small-file-problem'. So I am considering using Cassandra now. >>> But Hadoop has one important feature for me. The replicator continuously >>> examines whether data blocks are consistent across all datanodes. >>> This will detect disk errors and automatically move data from defective >>> blocks to working blocks. I think this is called 'self-healing mechanism'. >>> Is there a similar feature in Cassandra too? >>> >>> Thanks for help >>> >>> Ralph >>> >>> >>> >>> -- >>> >
