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new a7f8968 Fix Zstd compression level documentation
a7f8968 is described below
commit a7f89688e5b4fdc2f8990fc42cb593da4f6a923f
Author: Romain Hardouin <[email protected]>
AuthorDate: Tue Sep 24 11:20:54 2019 -0700
Fix Zstd compression level documentation
Patch by Romain Hardouin; Reviewed by Dinesh Joshi for CASSANDRA-15296
---
doc/source/operating/compression.rst | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/doc/source/operating/compression.rst
b/doc/source/operating/compression.rst
index 42a057b..b4308b3 100644
--- a/doc/source/operating/compression.rst
+++ b/doc/source/operating/compression.rst
@@ -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:
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