Hi Jeff,
Thanks for your reply. But I've already changed from LZ4 to Deflate to
get higher compression level. Can I in the Deflate compressor do the
same, set for a higher level of compression?
Another question to the creator of the TimeWindowsCompactionStrategy:
AND compaction = {'class':
'org.apache.cassandra.db.compaction.TimeWindowCompactionStrategy',
'compaction_window_size': '1', 'compaction_window_unit': 'HOURS',
'max_threshold': '128', 'min_threshold': '2'}
AND compression = {'chunk_length_in_kb': '64', 'class':
'org.apache.cassandra.io.compress.DeflateCompressor'}
There are some days that I have exactly 24 SSTables:
ls -alFh *Data*|grep 'Jul 3'|wc
24
Others no:
ls -alFh *Data*|grep 'Jul 2'|wc
59
Is this normal?
Thanks in advance.
On 06-07-2017 06:30, Jeff Jirsa wrote:
On 2017-07-01 02:50 (-0700), Cogumelos Maravilha <cogumelosmaravi...@sapo.pt>
wrote:
Hi list,
Is there a way to set Deflate level of compression?
Brotli sounds good but unstable.
I just need more compression ratio.
I'm using C* 3.11.0
LZ4 compression levels are configurable as of cassandra 3.6 (
https://issues.apache.org/jira/browse/CASSANDRA-11051 ) .
"The attached patch adds the following optional parameters 'lz4_compressor_type' and
'lz4_high_compressor_level' to the LZ4Compressor."
Glancing at the source:
https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/io/compress/LZ4Compressor.java#L41-L49
lz4_high_compressor_level defaults to 9.
lz4_compressor_type defaults to 'fast' ('high' is also available).
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