We are marching along in our integration of HBase with the Socorro Crash Stats project, but I wanted to take a minute away from that to talk about a separate project the Metrics team has also been involved with. Mozilla Labs Test Pilot is a project to experiment and analyze data from real world Firefox users to discover quantifiable ways to improve our user experience. I was very interested and e
There have been lots of discussions and speculations after the announcement that Facebook is using HBase for the new messaging system. In case you missed it, here are the most important bits: Kannan Muthukkaruppan: The underlying Technology of Messages (facebook.com) We spent a few weeks setting up a test framework to evaluate clusters of MySQL, Apache Cassandra, Apache HBase, and a couple of othe
Answer (1 of 3): While setting the a write consistency level of ALL with a read level of ONE in Cassandra provides a strong consistency model similar to what HBase provides (and in fact using quorum writes and reads would as well), the two operations are actually semantically different and lead t...
One of the more ambiguous things in Hadoop is block replication: it happens automatically and you should not have to worry about it. HBase relies on it 100% to provide the data safety as it stores its files into the distributed file system. While that works completely transparent, one of the more advanced questions asked though is how does this affect performance? This usually arises when the user
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