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https://issues.apache.org/jira/browse/OAK-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Dürig updated OAK-6984:
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Attachment: cycle-times.png
> High read IO in compaction retry cycles
> ---------------------------------------
>
> Key: OAK-6984
> URL: https://issues.apache.org/jira/browse/OAK-6984
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: segment-tar
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Labels: performance
> Fix For: 1.8, 1.7.13
>
> Attachments: compactioncycles.m, cpu.png, cycle-times.png,
> cycles.png, extract.sc, gcmetrics-15.png, gcmetrics-20.png, gcmetrics.m,
> readwrite.m, readwrite.png
>
>
> We have seen unusual high read IO in compaction retry cycles in our longevity
> tests at Adobe.
> !cpu.png|width=1000!
> Above picture shows the CPU utilisation during an online compaction run,
> which starts at 03:00. At about 03:22 CPU user time drops and CPU waiting for
> IO time increases. This point in time coincides with the start of the first
> retry cycle of compaction.
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