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According to reddit admins some of the recent downtimes in the last few months were due to cassandra and they were having some bad performance and stability iss

by pavs 16y ago

According to reddit admins some of the recent downtimes in the last few months were due to cassandra and they were having some bad performance and stability issues. I can look it up if anyone is interested but it will be a bit of a work, since they stated it (several times) in the comment section and perhaps once on a blog post too.

jbellis 16y ago
The cassandra issues were primarily ops failures, and secondarily an older version of Cassandra making it difficult to recover once it was overwhelmed. (Some of the resulting improvements in Cassandra are documented here: http://www.riptano.com/blog/whats-new-cassandra-065 http://www.riptano.com/blog/whats-new-cassandra-065) Cassandra looks to be working fine for reddit now: http://blog.reddit.com/2010/08/everything-went-better-than-expected.html http://blog.reddit.com/2010/08/everything-went-better-than-e...
- pavs 16y ago
  This could very well be, I remember one of the problems they were having is not having enough resources for cache or something similar. But I could be wrong I will ask them on twitter and see if they can comment here on it.
- ketralnis 16y ago
  > Cassandra looks to be working fine for reddit now Yep
ketralnis 16y ago
That would be me, and you're misquoting me. I screwed up our Cassandra deployment, and wrote about how I screwed it up. We were under-provisioned, and the version we were using didn't deal with the case of being overloaded in a graceful way. We're no longer under-provisioned, so I don't know if more recent versions deal with it better. We've never claimed to have performance issues, I don't know where you're getting that one.
- pavs 16y ago
  yup faulty memory, I tried to be more clear here: http://news.ycombinator.com/item?id=1670968 http://news.ycombinator.com/item?id=1670968 No malicious intent, after all, I did ask you for verification on twitter, linking here.

by pavs 16y ago

jbellis 16y ago

The cassandra issues were primarily ops failures, and secondarily an older version of Cassandra making it difficult to recover once it was overwhelmed. (Some of the resulting improvements in Cassandra are documented here: http://www.riptano.com/blog/whats-new-cassandra-065 http://www.riptano.com/blog/whats-new-cassandra-065) Cassandra looks to be working fine for reddit now: http://blog.reddit.com/2010/08/everything-went-better-than-expected.html http://blog.reddit.com/2010/08/everything-went-better-than-e...

pavs 16y ago
This could very well be, I remember one of the problems they were having is not having enough resources for cache or something similar. But I could be wrong I will ask them on twitter and see if they can comment here on it.
ketralnis 16y ago
> Cassandra looks to be working fine for reddit now Yep

ketralnis 16y ago

That would be me, and you're misquoting me. I screwed up our Cassandra deployment, and wrote about how I screwed it up. We were under-provisioned, and the version we were using didn't deal with the case of being overloaded in a graceful way. We're no longer under-provisioned, so I don't know if more recent versions deal with it better. We've never claimed to have performance issues, I don't know where you're getting that one.

pavs 16y ago
yup faulty memory, I tried to be more clear here: http://news.ycombinator.com/item?id=1670968 http://news.ycombinator.com/item?id=1670968 No malicious intent, after all, I did ask you for verification on twitter, linking here.