[jira] [Created] (JAMES-2925) Decreasing chunk_length_in_kb for read heavy workloads

["Benoit Tellier (Jira)" <se...@james.apache.org>]

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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