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Fix Zstd compression level documentation 

Patch by Romain Hardouin; Reviewed by Dinesh Joshi for CASSANDRA-15296
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Romain Hardouin 2019-09-24 11:20:54 -07:00 committed by Dinesh A. Joshi
parent bc5fc8bc2d
commit a7f89688e5
1 changed files with 3 additions and 1 deletions
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doc/source/operating/compression.rst
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@ -38,7 +38,9 @@ default, three options are relevant:
- ``chunk_length_in_kb`` specifies the number of kilobytes of data per compression chunk. The default is 64KB.
- ``crc_check_chance`` determines how likely Cassandra is to verify the checksum on each compression chunk during
reads. The default is 1.0.
- ``compression_level`` is only applicable for ``ZstdCompressor`` and accepts values between ``-131072`` and ``2``.
- ``compression_level`` is only applicable for ``ZstdCompressor`` and accepts values between ``-131072`` and ``22``.
The lower the level, the faster the speed (at the cost of compression). Values from 20 to 22 are called
"ultra levels" and should be used with caution, as they require more memory. The default is 3.
Users can set compression using the following syntax: