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Posted to commits@cassandra.apache.org by "Dinesh Joshi (Jira)" <ji...@apache.org> on 2021/09/20 23:30:00 UTC
[jira] [Assigned] (CASSANDRA-16436) Add startup check for large
read_ahead_kb setting
[ https://issues.apache.org/jira/browse/CASSANDRA-16436?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dinesh Joshi reassigned CASSANDRA-16436:
----------------------------------------
Assignee: Owen Qian
> Add startup check for large read_ahead_kb setting
> -------------------------------------------------
>
> Key: CASSANDRA-16436
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16436
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Startup and Shutdown
> Reporter: Paulo Motta
> Assignee: Owen Qian
> Priority: Normal
> Labels: lhf
>
> A well known production tuning recommendation is to dial back the {{read_ahead_kb}} Linux setting from the default of 4096 in most distributions as this can cause high IO usage and cache churn on read-intensive workloads.
> We should add a startup warning to detect when a high {{read_ahead_kb}} is used and recommend the user to dial back to a reasonable value, which varies according to the workload but a general guideline is to tune this to 8kb.
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