[CASSANDRA-15080] Paxos tables should use a 4KB chunk length

• Type: Improvement
• Status: Triage Needed
• Priority: Normal
• Resolution: Unresolved
• Component/s: Feature/Lightweight Transactions
• Labels: performance
• Change Category: Performance
• Complexity: Low Hanging Fruit
• Assignee: Jon Haddad
• Reporter: Jon Haddad

Authors

Jon Haddad

• Created: 06/Apr/19 17:17
• Updated: 03/Jul/19 19:26

Description

In doing some research for a client on LWTs, I found that once we start pushing a node hard enough, with enough LWTs, decompressing the data in the paxos table takes up quite a bit of time. I've attached an SVG flame graph showing about 10% of time is spent in LZ4_decompress_fast in queries hitting the paxos table. We should be able to get a nice little performance bump from changing this to 4KB chunk length or disabling it completely.