COMPRESSION IN CASSANDRA Operators can set up compression on a per-table basis with Cassandra. By compressing the SSTable in user-configurable compression chunk_length_in_kb, compression minimizes the amount of data on disk. The CPU cost of compressing data is only required when the SSTable is written since… Read More
INSTALLING CASSANDRA USING DEBIAN PACKAGES Debain Package: It is a collection of files which are used to implement a set of features or commands. You can only use the Debain packages on Ubuntu and other Debain-based distributions. STEP-1: Java setup Check the version of Java… Read More
CASSANDRA INSTALLATION USING TARBALL BINARY FILE ▪️ We have 3 methods of installing Cassandra. In that this one is the one of the methods. ▪️ This will be installing in the Linux terminal only. ▪️ Follow the steps accordingly to install Apache Cassandra in Linux… Read More
SIZE TIERED COMPACTION STRATEGY: The traditional suggested compaction technique is the Size Tiered Compaction Strategy (STCS), which is advised for workloads that involve a lot of writing. If no other compaction strategy is specified, this one is used by default. When Cassandra has amassed a… Read More
HOW TO CHOOSE SS TABLES TO COMPACT SSTables are separated by density leveling in levels determined by the fan factors of the compaction setup. The amount of SSTables on a level, however, cannot be used as a trigger because there may be non-overlapping SSTables, unlike… Read More
STRATEGIES OF COMPACTION ▪️ Unified Compaction Strategy (UCS) ▪️ Size-Tiered Compaction Strategy (STCS) ▪️ Leveled Compaction Strategy (LCS) ▪️ Time Window Compaction Strategy (TWCS) UNIFIED COMPACTION STRATEGY: For the majority of workloads, including mixed read-write, time-series, read-heavy, and write-heavy workloads, the UnifiedCompactionStrategy (UCS) is… Read More
CHANGE DATA CAPTURE When a configurable size-on-disk for the CDC log is reached, Change Data Capture (CDC) offers a technique to refuse writes to certain tables and flag them for archiving. By setting the table property cdc=true (either when creating the table or modifying it),… Read More
APACHE CASSANDRA INSTALLATIONS These are the guidelines for setting up the supported Apache Cassandra releases on Linux systems. Cassandra runs on a wide array of Linux distributions including (but not limited to): ⦁ Ubuntu, most notably LTS releases 16.04 to 18.04. ⦁ CentOS & RedHat… Read More
BLOOM FILTERS WHAT ARE BLOOM FILTERS: Cassandra combines data from RAM (in memtables) and disk (in SSTables) in the read path. Cassandra uses a data structure called a bloom filter to avoid having to go through each and every SSTable data file to find the… Read More
CASSANDRA BACKUPS WHAT ARE BACKUPS: Immutable SSTable files are used by Apache Cassandra to store data. The backup copies of the database data that are kept as SSTable files in the Apache Cassandra database are called backups. There are various uses for backups, some of… Read More
