[jira] [Commented] (OAK-5944) VersionGarbageCollector: allow to update _deletedOnce in batch operations

["Stefan Eissing (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-5944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15932372#comment-15932372 ] 

Stefan Eissing commented on OAK-5944:
-------------------------------------

My measurements (dev laptop, SSD, local 3.4 mongo), 100GB aem database
{{oak-run revisions collect}}:
- previous version:
{code}
2565 docs/s (25229600 docs, 9835598.537 ms)
{code}
- this patch:
{code}
3946 docs/s (27818380 docs, 7049613.160 ms)
{code}


> VersionGarbageCollector: allow to update _deletedOnce in batch operations
> -------------------------------------------------------------------------
>
>                 Key: OAK-5944
>                 URL: https://issues.apache.org/jira/browse/OAK-5944
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: documentmk
>            Reporter: Julian Reschke
>         Attachments: OAK-5944.diff
>
>
> Right now, we collect the update operations in batches, but then issue individual update operations.
> A special-case API that takes a set of updates and applies them in a single DB operation might speed up things, in particular when there's a network hop.
> Related to this, we may want to think about whether we need to attach a modified check to each single operation (by keeping the {{_modified}} value for each {{_id}}). Wouldn't it be sufficient to just check that the {{_modified}} value is not newer than the end of the time window for the VGC run? 



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