Re: Data loss and corruption

2010-06-09 Thread Jonathan Ellis
Evan was just doing a ritual CYA and saying "this is new technology" [about a year ago]. On Tue, Jun 8, 2010 at 10:45 PM, Hector Urroz wrote: > Hi all, > We're starting to prototype Cassandra for use in a production system and > became concerned about data corruption after reading the excellent a

Re: Data loss and corruption

2010-06-09 Thread Ben Standefer
In my opinion the #1 risk for corruption is user/client error with the timestamps. Over time, Cassandra flushes data from memory to disks. After it flushes to disk, Cassandra doesn't go back to delete or modify that data. Because of this, deletes are performed by writing a "tombstone" to disk.

Data loss and corruption

2010-06-08 Thread Hector Urroz
Hi all, We're starting to prototype Cassandra for use in a production system and became concerned about data corruption after reading the excellent article: http://blog.evanweaver.com/articles/2009/07/06/up-and-running-with-cassandra/ where Evan Weaver writes: "Cassandra is an alpha product and