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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 |
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
meformat is mandatory, andmdformat is used only when upgrading from an existing cluster usingmd. Thesstable_formatparameter is ignored if it is set tomd.In ScyllaDB 5.1 and above, the
meformat is enabled by default.In ScyllaDB 4.3 to 5.0, the
mdformat is enabled by default.In ScyllaDB 3.1 to 4.2, the
mcformat is enabled by default.In ScyllaDB 3.0, the
mcformat is disabled by default. You can enable it by adding theenable_sstables_mc_formatparameter set totruein thescylla.yamlfile. For example:enable_sstables_mc_format: true
Additional Information¶
For more information on ScyllaDB 3.x SSTable formats, see below: