Storage Engine
Project description
License
Status
Hadro is in alpha. Alpha means different things to different people, to us, being alpha means:
- Interfaces may be significantly changed
- The data file format is unstable
- Expected functionality is missing
- Things that worked yesterday, don't work today
- The results of the system may be unreliable
As such, we really don't recommend using HadroDB anywhere where your data matters.
File Format
Magic Bytes
HADRO
Version
001
Header
Section table - Type, Offset, Size, Compression Algo
Record Count
Values Hash
Flags (bytes) Value Store Compression Algo (0 = none, 1 = LZ4, 2 = zSTD)
Column Names (not every record has every column)
PK column name
Statistics
Column, Count, Min, Max, unique values
Indexes
Key, Version, Offset, Length
- used for the PK index (mandatory) and other values (optional)
Key is binary encoded and limited to 64 bytes, if the value is longer, it needs to be filtered from the value
OR
number of entries value, bitmap
Values
Entries of MsgPack bytes
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File metadata
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