Benoit Tellier created JAMES-2925:
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Summary: Decreasing chunk_length_in_kb for read heavy workloads
Key: JAMES-2925
URL: https://issues.apache.org/jira/browse/JAMES-2925
Project: James Server
Issue Type: Improvement
Components: cassandra, mailbox
Reporter: Benoit Tellier
James mostly serve primarily reads with a ration often other 80%.
We often benefit from read optimization.
Such an optimization is the size of chunks being LZ4 compressed within SSTables
files:
- bigger chunks means better compression
- but also means all reads need to load the full chunk size, thus costing IOs
For read heavy workloads, experiment shows decreasing the chunk size from 64KB
(default) to a more reasonable value (like 4KB) often leads to significant
performance enhancement.
As an adoption step, we should conduct a performance test on read-heavy
mailbox-metadata. If conclusive, we can consider adoption on some other often
read metadata.
As a reference here is a reference article on the last pickle blog:
https://thelastpickle.com/blog/2018/08/08/compression_performance.html
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