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From "Dmitriy Pavlov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-7606) Write evicted dirty page during eviction without holding segment write lock
Date Fri, 02 Feb 2018 17:30:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-7606?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dmitriy Pavlov updated IGNITE-7606:
-----------------------------------
    Attachment: chart_notHoldingLock.png
                chart_holdingLock.png

> Write evicted dirty page during eviction without holding segment write lock
> ---------------------------------------------------------------------------
>
>                 Key: IGNITE-7606
>                 URL: https://issues.apache.org/jira/browse/IGNITE-7606
>             Project: Ignite
>          Issue Type: Improvement
>          Components: persistence
>            Reporter: Dmitriy Pavlov
>            Assignee: Dmitriy Pavlov
>            Priority: Major
>             Fix For: 2.5
>
>         Attachments: chart_holdingLock.png, chart_notHoldingLock.png, putdumpAt17second.txt
>
>
> If a dirty page under the checkpoint is found, following is suggested
> - copy it to the local thread buffer, 
> - and then after performing all actions in region for evicting the page
> - finish execution allocatePage()/acquirePage()
> - unlock segment to allow other workers to operate
> - perform the pwrite() call based on the data from local buffer
> Now if page eviction started there is possible drops to 0 put/seconds in case a lot of
threads are watiting for same segment lock.



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