Cassandra

This page describes the Optimization Pack for the component type Cassandra.

Metrics

Metric		Description
read_rate	ops/s	Read queries per second
read_response_time_p99	milliseconds	99th percentile of read queries response time
read_response_time_avg	milliseconds	Average response time of read queries
write_rate	ops/s	Write queries per second
write_response_time_p99	milliseconds	99th percentile of write queries response time
read_response_time_max	milliseconds	Maximum response time of read queries
total_rate	ops/s	Total queries per second
write_response_time_avg	milliseconds	Average response time of write queries
write_response_time_max	milliseconds	Maximum response time of write queries
read_response_time_p90	milliseconds	90th percentile of read queries response time
write_response_time_p90	milliseconds	90th percentile of write queries response time

Parameters

Parameter	Type	Unit	Default Value	Domain	Restart	Description
cassandra_compactionStrategy	categorical		SizeTieredCompactionStrategy	LeveledCompactionStrategy, SizeTieredCompactionStrategy, TimeWindowCompactionStrategy	yes	Compaction strategy in use
cassandra_concurrentReads	integer		32	2 → 128	yes	Concurrent Reads
cassandra_concurrentWrites	integer		32	2 → 128	yes	Concurrent Writes
cassandra_fileCacheSizeInMb	integer	megabytes	512	128 → 4096	yes	Total memory to use for SSTable-reading buffers
cassandra_memtableCleanupThreshold	real		0.11	0.01 → 0.99	yes	Ratio used for automatic memtable flush
cassandra_concurrentCompactors	integer		2	1 → 32	yes	Sets the number of concurrent compaction processes allowed to run simultaneously on a node
cassandra_commitlog_compression	categorical		NoCompressor	NoCompressor, LZ4Compressor, SnappyCompressor, DeflateCompressor		Sets the compression of commit log
cassandra_commitlog_segment_size_in_mb	integer	megabytes	32	8 → 32		Sets the segment size of commit log
cassandra_compaction_throughput_mb_per_sec	integer	megabytes/s	16	0 → 999		Sets the number of throughput for compaction
cassandra_commitlog_sync_period_in_ms	integer	milliseconds	10000	1 → 25000		Sets the sync period of commit log