CassandraMetriccassandra_live_ss_table
Number of live SSTablesDimensions:None
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Knowledge Base (7 documents, 0 chunks)
guideCompaction in Cassandra | Datavail1441 wordsscore: 0.65This guide explains Cassandra's compaction process, including different compaction strategies (STCS, LCS, DTCS, TWCS), tuning parameters, and performance impacts. It covers when to use each strategy and how to troubleshoot compaction-related performance issues like slow reads and node unreachability.
troubleshootingCassandra Node unable to compact - Stack Diagnosis489 wordsscore: 0.72This page provides troubleshooting guidance for Cassandra nodes unable to complete compaction due to resource constraints. It covers root causes like insufficient disk space, memory, and CPU, along with resolution steps including resource allocation adjustments, compaction strategy changes, and monitoring recommendations.
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Compaction Strategies, Performance, and Their Impact on Cassandra Node Density1766 wordsscore: 0.65This blog post examines how different compaction strategies in Apache Cassandra impact node density and cost efficiency. It covers the trade-offs of STCS, LCS, and TWCS, and advocates for the new UnifiedCompactionStrategy (UCS) in Cassandra 5.0 as a game-changer that combines benefits of previous strategies while maintaining controlled SSTable sizes.
troubleshootingbigdata - Cassandra low read performance with high SSTable count - Stack Overflow1958 wordsscore: 0.72A Stack Overflow question discussing Cassandra read performance issues related to high SSTable count. The discussion covers interpreting nodetool cfstats output, understanding SSTable distribution, and recommendations for compaction strategy selection (SizeTieredCompactionStrategy vs LeveledCompactionStrategy) to improve read performance.
troubleshootingKey Concepts: Cassandra Heap Issues666 wordsscore: 0.75This page provides troubleshooting guidance for Cassandra heap memory issues and Out Of Memory (OOM) exceptions. It explains common causes including memtables, read patterns, repair operations, and compactions, along with diagnostic approaches using nodetool commands and potential workarounds for heap pressure.
troubleshootingResolving Cassandra Query Timeout Issues: Optimizing Performance and Ensuring Stability - Proactive Insights and Support For Open-Source Applications376 wordsscore: 0.65This page describes a case study of resolving Cassandra query timeout issues in a production environment. It covers troubleshooting steps including investigating cluster health, reviewing table sizes and SSTables, and implementing solutions like increasing timeout configurations and adding indexes to improve query performance.
best practicesWhat you should understand before using Apache Cassandra in production | Running Code606 wordsscore: 0.75This blog post explains Cassandra's storage architecture (memtables, SSTables, and compaction) and emphasizes a critical operational best practice: setting disk space alerts at 50% rather than the typical 80-90% threshold. This is because compaction requires approximately 50% free disk space to merge SSTables, and without compaction, disk space cannot be freed, creating an operational crisis.
Related Insights (4)
Compaction Backlog Causing Read Latency Cascadecritical
When pending compaction tasks accumulate faster than they can complete, reads must scan excessive SSTables, driving p99 latency upward and eventually causing timeout exceptions. This silent storage debt compounds over time.
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Compaction Strategy Mismatch Degrading Node Densitywarning
Using STCS (Size-Tiered) creates unbounded SSTable growth and prevents fast streaming, while LCS (Leveled) causes excessive write amplification under heavy load. Both reduce effective node density and operational efficiency compared to UCS (Unified) in Cassandra 5.0+.
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Trie-based SSTable format replaces BTree SSTableswarning
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Unified Compaction Strategy consolidates compaction strategieswarning
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