Questions tagged [cassandra]
Apache Cassandra is an open source distributed database management system. It is designed to handle very large amounts of data spread out across many commodity servers while providing a highly available service with no single point of failure. It is a NoSQL solution.
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What does 0% repair mean in Cassandra and what is its impact?
We have a Cassandra table with a huge amount of data (1TB+) and currently show 0% repair. Because of the large dataset, we avoid running a full repair to reduce the impact on end users, so we plan to ...
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Cassandra node stuck in UJ (Up/Joining) for weeks—streaming stalls ~890 GB of 1 TB, restart doesn’t help (Kubernetes, 3‑node cluster)
We run a 3‑node Apache Cassandra cluster on Kubernetes (long‑running, used for years in both on‑prem and cloud). On our on‑prem environment, one node has been stuck in UJ (Up/Joining) for weeks. It’s ...
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Setting up Cassandra with PEMBasedSslContextFactory results in configuration error
I followed the guide for setting up client to server encryption with the PEMBasedSslContextFactory for Cassandra at https://cassandra.apache.org/doc/stable/cassandra/managing/operating/security.html#...
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How commitlog_sync works with direct I/O?
If I set commitlog_disk_access_mode: direct - what's happening to commitlog_sync? It sounds like now I get something close to batch option?
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decommissioned node still stuck in metrics
Need some help with our Cassandra 4.1.3 operation.
We successfully decommissioned a node in remote datacenter by first “ALTER KEYSPACE” with remaining datacenter, then “nodetool decommission”
nodetool ...
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Facing table deletion when doing alter keyspace on cassandara 5.0.2
I've been facing a weird issue where if I alter a keyspace, all the tables are deleted along with the data. Any help in debugging this would be greatly appreciated. Here's what I followed and what i ...
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Cassandra abnormal reboot and data loss on k8s
I have a 2 data center cassandra k8s cluster that I use for qa testing and various db admin trials/prototyping. Each data center has 2 racks with 2 nodes on the first rack and one node at the second ...
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How to back up commitlogs in a Hyper Converged Database (HCD)?
I am working with a Hyper-Converged Database (HCD), which is based on Cassandra, and I need to implement a backup strategy that includes commitlogs along with SSTables.
I understand that Medusa only ...
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nodetool issue after updated cassandra from 4.0.18 to 4.1.10
We are using Flux to deploy k8ssandra CRDs as a Helm chart. I updated Cassandra to 4.1.10 in the K8ssandraCluster manifest. Cluster is up and running, and Authentication is enabled, but nodetool doesn'...
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Unable to log into a fresh single node installation of 5.0.4 on RHEL9
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When building a Cassandra DB 5.0.4 single node database instance on a VM with RHEL9, I am unable to log in once I enable authentication/authorization. With authentication/authorization disabled, ...
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DNS service not found when deploying 2 cassandra in swarm
In shorts cassandra_2 keeps failing to start because it can't resolve cassandra_1 as its CASSANDRA_SEEDS.
this is my docker stack yml
services:
cassandra_1:
image: cassandra:5.0.5-jammy
...
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Improved write performance after restarting Cassandra nodes
I have a 24-node cluster that receives 400k to 600k ops/s at a latency of approximately 15ms-20ms at the 99th percentile.
I haven't found the reason why after restarting the nodes, writes increase to ...
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Can I upgrade Cassandra 3.11.9 directly to Cassandra 4.0.x or 4.1.x in an 8-node cluster with 2TB data per node?
I have a Cassandra cluster with the following setup:
Cassandra version: 3.11.9
Number of nodes: 8
Data size per node: ~2 TB
I am planning to upgrade to a Cassandra 4.x release (preferably the latest ...
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cassandra disk space not freeing up
I have Cassandra on K8s. It's being used as part of a temporal persistence store. I'm seeing that my disk space is ever growing. I'm deleting some completed workflows, but they still occupy disk space....
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SSTable increase a lot after repair
I'm trying repair in one of the node
nodetool repair -full -st start_token -et end_token keyspace table_name
I found the SSTable count of this table continusly increase and it's useless on compact ...
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