Cassandra Firewall Issues
If you’re having problems connecting to Cassandra, you may be experiencing Windows Firewall issues. To fix this issue, follow the steps below:
Table of Contents
The nodetool command is a simple way to repair a Cassandra cluster. The repair command compares all replicas’ token ranges to the most recent version. If the repair fails, a -pr flag is used to repair only the node’s primary ranges. This can be done to run the repair command on all nodes at once. Note that this command uses more system resources, but it improves repair time.
In incremental repair, the process does not attempt to rebuild the same Merkle trees for each SSTable. This reduces repair io and performance impacts. The process should be run frequently, particularly if a table was created before Cassandra 2.2. However, a full repair should still be run occasionally. This is because a full repair requires a lot of io. Nodetool has an option to automate the repair process to reduce the performance impact.
Windows Firewall blocking communication
If your firewall is preventing communication with the Cassandra service, you should take the following steps: First, close any external access. This will prevent the Cassandra instance from making new changes to the disk. Next, ensure that your local static IP is set to allow communication from the internet. Finally, wait for at least five minutes before closing the instance. If you still cannot see the Cassandra service, try disabling the firewall.
Ports used by cassandra squirrel
Cassandra uses the memory mapping technology called “mmap” internally. This technology maps on-disk files into the Cassandra process’ address space. The resulting memory will be effectively unlimited on a 64-bit system. Cassandra uses this technique to optimize its performance for high-volume write operations. However, Cassandra does not handle very large blobs well. In such cases, it is recommended that large blobs be split into smaller chunks.
To run Cassandra on your system, you must open the ports that Cassandra uses. If you do not open these ports, your nodes will be acting as standalone database servers, not joining the Cassandra cluster. You can use this method to prevent any potential issues with connectivity. You may need to check your firewall and other security programs before proceeding. If your firewall does not allow you to open ports, try reconfiguring or disabling it.
Jessica Watson is a PHD holder from the University of Washington. She studied behavior and interaction between squirrels and has presented her research in several wildlife conferences including TWS Annual Conference in Winnipeg.