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Akumuli is a time-series database. The word "akumuli" can be translated from esperanto as "accumulate".
Most open source projects focus on query language and things useful for web-analytics, but they ignore some key characteristics of time series data:
- High write throughput (millions of data-points per second)
- Very late writes can be dropped
- Numeric time-series can be compressed very efficiently
- Periodic time-series can be compressed very efficiently
- Compression is crucial for time-series storage!
- Implements specialized storage engine for time-series data
- Memory mapped and x64 only
- Uses constant amount of disk space (like RRD-tool)
- Crash recovery
- Very high write throughput (about 1M writes per second on single machine)
- Allows unordered writes
- Compressed (specialized compression algorithms for different data elements - timestamps, ids, values)
- Easy to use server software (based on Redis protocol)