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Posted to commits@cassandra.apache.org by "Jon Haddad (JIRA)" <ji...@apache.org> on 2019/08/13 22:26:00 UTC
[jira] [Updated] (CASSANDRA-15080) Paxos tables should allow a
configurable chunk length
[ https://issues.apache.org/jira/browse/CASSANDRA-15080?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jon Haddad updated CASSANDRA-15080:
-----------------------------------
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 allow the user to modify the compression settings on this table.
was: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.
> Paxos tables should allow a configurable chunk length
> -----------------------------------------------------
>
> Key: CASSANDRA-15080
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15080
> Project: Cassandra
> Issue Type: Improvement
> Components: Feature/Lightweight Transactions
> Reporter: Jon Haddad
> Assignee: Jon Haddad
> Priority: Normal
> Labels: performance
> Attachments: flamegraph-bad-perf.svg
>
>
> 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 allow the user to modify the compression settings on this table.
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