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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Updated] (OAK-6984) High read IO in compaction retry cycles
Date Wed, 06 Dec 2017 10:13:00 GMT

     [ https://issues.apache.org/jira/browse/OAK-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Dürig updated OAK-6984:
-------------------------------
    Issue Type: Bug  (was: Improvement)

> High read IO in compaction retry cycles
> ---------------------------------------
>
>                 Key: OAK-6984
>                 URL: https://issues.apache.org/jira/browse/OAK-6984
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          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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