Cassandra Disk full
A node's disk is full, preventing further writes.
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What is
Cassandra Disk full
?
Understanding Apache Cassandra
Apache Cassandra is a highly scalable, distributed NoSQL database designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure. It is widely used for its ability to manage large datasets across multiple nodes with ease, ensuring data redundancy and fault tolerance.
Identifying the Symptom: Disk Full
One common issue encountered in Cassandra is the 'Disk full' error. This occurs when a node's disk space is completely utilized, preventing further writes to the database. This can lead to degraded performance and potential data loss if not addressed promptly.
Observed Error
When the disk is full, you might observe errors in the logs such as:
ERROR [CompactionExecutor:1] 2023-10-01 12:00:00,000 CassandraDaemon.java:123 - Out of disk space, unable to write data
Exploring the Issue: Disk Full
The 'Disk full' issue arises when the storage capacity allocated to a Cassandra node is exhausted. This can happen due to several reasons such as high write throughput, inadequate disk space allocation, or lack of regular maintenance tasks like compaction and cleanup.
Root Causes
- High volume of write operations leading to rapid disk consumption.
- Insufficient disk space allocated during initial setup.
- Lack of regular maintenance tasks such as compaction and cleanup.
Steps to Resolve the Disk Full Issue
To resolve the 'Disk full' issue, you can follow these steps:
1. Free Up Disk Space
Identify and remove unnecessary files or data from the disk. This can include old snapshots, logs, or temporary files. Use the following command to list and remove old snapshots:
nodetool clearsnapshot
2. Add Additional Storage
If freeing up space is not sufficient, consider adding additional storage to the node. This might involve attaching new disks or expanding existing volumes.
3. Perform Regular Maintenance
Ensure regular maintenance tasks are scheduled, such as:
- Compaction:
nodetool compact - Cleanup:
nodetool cleanup
Additional Resources
For more detailed information on managing disk space in Cassandra, refer to the following resources:
Attached error:
Cassandra Disk full
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