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From "Maxim Khutornenko (JIRA)" <>
Subject [jira] [Commented] (AURORA-1211) Spread snapshot creation and backup file write
Date Fri, 20 Mar 2015 01:19:38 GMT


Maxim Khutornenko commented on AURORA-1211:

Java GC latencies may be impacted by IO bandwidth under certain conditions. Likewise, GC activity
may result in increased IO utilization. I don't have an experimental proof but these links
provide some food for thought:

Given it's much easier to add a minor delay than provide a definitive proof (given a variety
of JVM configurations used in practice) I'd rather take this change to rule out their cross-influence.

> Spread snapshot creation and backup file write
> ----------------------------------------------
>                 Key: AURORA-1211
>                 URL:
>             Project: Aurora
>          Issue Type: Task
>          Components: Scheduler
>            Reporter: Maxim Khutornenko
> Currently, backup files are written asynchronously and overlay with the peak of GC cleaning
up after persisting snapshot in native log. We should generally avoid overlaying resource-heavy
activities when possible to avoid troubleshooting complicated performance related issues.
> Consider delaying backup file write (e.g. for 1 minute) to clearly separate its impact
from the snapshot GC.

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