Homebrew does not support OpenJDK@8 on Apple Silicon (M1/M2) but Zulu Community 8 is present as a cask. You just have to enable cask-versions repository and install zulu8 cask. brew tap homebrew/cask-versions brew install –cask zulu8 It will install the JDK in /Library/Java/JavaVirtualMachines/zulu-8.jdk/Contents/Home. You should then configure your JAVA_HOME variable for development tools to use … Read more
Super columns suffer from a number of problems, not least of which is that it is necessary for Cassandra to deserialze all of the sub-columns of a super column when querying (even if the result will only return a small subset). As a result, there is a practical limit to the number of sub-columns per … Read more
No, there is no default value in Cassandra. Further more, setting a column value to null means removing it
Client sends the data to a random node It might seem that way, but there is actually a non-random way that your driver picks a node to talk to. This node is called a “coordinator node” and is typically chosen based-on having the least (closest) “network distance.” Client requests can really be sent to any … Read more
There is no way to change a primary key, as it defines how your data is physically stored. You can create a new table with the new primary key, copy data from the old one, and then drop the old table.
I think the issue was the result of having a previous installation that wasn’t properly uninstalled. My user .cassandra directory had some default configs, that must have been for a different version, and prevented cqlsh from starting. rm -Rf ~/.cassandra After that, I could run cqlsh properly. $ bin/cqlsh Connected to Test Cluster at 127.0.0.1:9042. … Read more
TL;DR; You can even start with a single node, but you loose the highly available factor of c*. Cassandra is built for systems that handle huge volumes of data, terabytes and in some cases petabytes. Many users typically switch from MySQL (and lots of other RDBMS) to Cassandra once they find that their current DB … Read more
The basic problem we are trying to solve is this: Can a situation occur in which a read doesn’t return the most up-to-date value? Obviously, this is best avoided if possible! If R+W <= N, then this situation can occur. A write could send a new value to one group of nodes, while a subsequent … Read more
I had exactly the same issue: Can’t start Cassandra (Single-Node Cluster on CentOS7) If it is an option for you, using Java 8, instead of 9, is the simplest way to solve the issue.
Twitter is running rails on most of their front end. Fauna’s client is actually built and released by twitter, so you can be pretty certain that it’s up to date and stable on large workloads. Looking at the history of commits shows that there are frequent improvements being pushed to it, which is great. Most … Read more