IssueRaiser

Great write up!

Great write up! I wish there was a little bit more color around what "availability" really means. Yes some data stores are offering higher availability, but that doesn't mean they are immune to node failure. Even for a "CP" system, latencies can go up, and with enough node failures, partial unavailability and data loss can occur. And few systems survive the loss of a rack without some issues! Let alone a total network in half partition! In theory, a strongly consistent system could have a failover that is so small that it is, from a user pov, always available. It would have very easy to understand programming model. But such a system doesn't really exist, open source wise, at this time. So we just won't know.

Posted by ryanobjc on May 18, 2014, 4:34 AM

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Great write up!

ryanobjcMay 18, 2014, 4:34 AM

Great write up! I wish there was a little bit more color around what "availability" really means. Yes some data stores are offering higher availability, but that doesn't mean they are immune to node failure. Even for a "CP" system, latencies can go up, and with enough node failures, partial unavailability and data loss can occur. And few systems survive the loss of a rack without some issues! Let alone a total network in half partition! In theory, a strongly consistent system could have a failover that is so small that it is, from a user pov, always available. It would have very easy to understand programming model. But such a system doesn't really exist, open source wise, at this time. So we just won't know.

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