The concept of compaction is used for different kinds of operations in Cassandra, the common thing about these operations is that it takes one or more SSTables and output new SSTables. …

To keep the database healthy, Cassandra periodically merges SSTables and discards old data. This process is called compaction. Why must compaction be run? Since SSTables are …

2022年2月18日 · Cassandra provides a start-up option for testing compaction strategies without affecting the production workload. Cassandra supports the following compaction strategies, …

UCS is a compaction strategy that combines the best of the other strategies plus new features. UCS has been designed to maximize the speed of compactions, which is crucial for high …

Compaction is about merging sstables, since partitions in sstables are sorted based on the hash of the partition key it is possible to efficiently merge separate sstables. Content of each …

Cassandra快速在SSTable索引中查找行的位置并解压缩相关的行块。压缩对于Cassandra 2.2非常重要，但Cassandra 3.0和更高版本使用新的存储引擎，可以自动大幅降低磁盘容量。有 …

Cassandra provides a start-up option for testing compaction strategies without affecting the production workload. Using CQL, you configure a compaction strategy: …

The Unified Compaction Strategy (UCS) is the recommended compaction strategy for most workloads starting with Cassandra 5.0. If you are creating new tables, use this strategy. The …

2017年1月4日 · Cassandra快速在SSTable索引中查找行的位置并解压缩相关的行块。压缩对于Cassandra 2.2非常重要，但Cassandra 3.0和更高版本使用新的存储引擎，可以自动大幅降低 …

2011年11月29日 · 之前cassandra的压缩策略和 Google’s Bigtable paper这篇文章中的压缩策略一样，也就是Tiered Compaction. 当有足够多的大小相当的SStables出现时， cassandra就将这 …