Does anyone have experience with both Cassandra and HBase? To me, they target at a similar problem. I am wondering what are main differences between these two, like reliablity/performance/features?

We apologize for the downtime, and the App Engine team is continuing our to work improve the availability and power of App Engine. Our full post-mortem analysis is below.

I wanted to find out how Tornado performs running WSGI applications. Currently, I run my WSGI applications on CherryPy's WSGI server.

That choice had issues as well since Mogile was not very well engineered for scaling to true web scale.  We felt then, and I think that this is still true, that putting the effort into Mogile to stabilize it was a bit easier than putting the effort into Hadoop to scale it. noui=1

CPAN module does not have the option of un-installing a perl module as of now. This can be especially frustrating for newbies (as it was for me). I struggled quite a bit on google and found this solution. For this, you need the CPANPLUS module, which needs to be first installed through CPAN.

Since it was already necessary to abandon data normalization and consistency to make these approaches work, we felt comfortable looking at more exotic, non-relational data stores. After considering HBase, Hypertable, Cassandra, Tokyo Cabinet/Tyrant, Voldemort, and Dynomite, we settled on Cassandra.noui=1

We often get asked how Digg works from a technology perspective, so wanted to shed some insight on this with our first post from the newly-launched technology blog. We’ll be posting regularly to give you a peek at what’s under the hood from the Digg development teams.noui=1

第四种：复杂一点的group，sum，count查询，比如一个论坛里按点击数排名的最HOT的帖子列表。第一种比较好实现，后面三种比较困难，虽然可以通过各种方法来解决，但截至目前，似乎还没有使用即简单、并发处理能力又强、实时性又高的解决办法。

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