Why cassandra writes are faster

Similarly, Bloomberg serves up more than 20 billion requests per day across a nearly 1PB dataset spanning more than 1, Cassandra nodes. The challenge advocates of Cassandra continue to face is that deploying and managing a Cassandra database requires a significant amount of expertise.

In many cases, applications only find their way off an open source document database once they run out of headroom. Many of them can configure a document database without any intervention of a database administrator DBA required.

However, a database that can scale up to process petabytes of unstructured data may eventually be required. We may collect cookies and other personal information from your interaction with our website.

For more information on the categories of personal information we collect and the purposes we use them for, please view our Notice at Collection. What if I told you that when you get the response from Cassandra, that your write operation was successful, your data had been stored only in memory even for 10 seconds the default setting before it was flushed to the commit log?

Keep in mind, that commit log guarantees durability in case of a node restart or failure. Just read the documentation carefully. Cassandra is a distributed DB. You should never launch it on production with a single node setup.

This is how it works, nothing comes for free, especially in terms of performance. To be honest, if you think that your RDBMS is safer to use when it comes to durability, you are just lying to yourself.

Data durability and replication can be a topic of many other blog posts, but our main focus for today is the Cassandra write path. How would this be persisted to the SSTable? You can verify it thanks to the sstabledump util.

Nothing special, last write wins, everything as expected. How would this behave if we update the order status after a week? Also, I tweaked a little bit the default compaction strategy to be less aggressive:. Now we have 4 SSTables:. In details:. Leave this field empty. Let's continue the conversation! I opt-in to receive further communications from Zymr over my details shared here.

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Asked 3 years ago. Active 3 years ago. Viewed times. Can some one please explain the cases why Cassandra's wites fast. Improve this question. Add a comment. Active Oldest Votes.