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ScyllaDB SSTable - 3.x¶
Sorted Strings Table (SSTable) is the persistent file format used by ScyllaDB and Apache Cassandra. SSTable is saved as a persistent, ordered, immutable set of files on disk.
Immutable means SSTables are never modified; they are created by a MemTable flush and are deleted by a compaction.
The location of ScyllaDB SSTables is specified in scylla.yaml data_file_directories parameter (default location: /var/lib/scylla/data).
SSTable 3.x is more efficient and requires less disk space than the SSTable 2.x.
SSTable Version Support¶
SSTable Version |
ScyllaDB Enterprise Version |
ScyllaDB Open Source Version |
|---|---|---|
3.x (‘me’) |
2022.2 and above |
5.1 and above |
3.x (‘md’) |
2021.1 |
4.3, 4.4, 4.5, 4.6, 5.0 |
3.0 (‘mc’) |
2019.1, 2020.1 |
3.x, 4.1, 4.2 |
2.2 (‘la’) |
N/A |
2.3 |
2.1.8 (‘ka’) |
2018.1 |
2.2 |
In ScyllaDB 6.0 and above, the me format is mandatory, and md format is used only when upgrading from an existing cluster using md. The sstable_format parameter is ignored if it is set to md.
Additional Information¶
For more information on ScyllaDB 3.x SSTable formats, see below: