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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 |
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 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.
In ScyllaDB 5.1 and above, the me format is enabled by default.
In ScyllaDB 4.3 to 5.0, the md format is enabled by default.
In ScyllaDB 3.1 to 4.2, the mc format is enabled by default.
In ScyllaDB 3.0, the mc format is disabled by default. You can enable it by adding the enable_sstables_mc_format parameter set to true in the scylla.yaml file. For example:
enable_sstables_mc_format: true
For more information on ScyllaDB 3.x SSTable formats, see below:
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