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https://issues.apache.org/jira/browse/OAK-2492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcel Reutegger updated OAK-2492:
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Fix Version/s: (was: 1.3.9)
1.4
> Flag Document having many children
> ----------------------------------
>
> Key: OAK-2492
> URL: https://issues.apache.org/jira/browse/OAK-2492
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: mongomk
> Reporter: Chetan Mehrotra
> Assignee: Chetan Mehrotra
> Labels: performance
> Fix For: 1.4
>
>
> Current DocumentMK logic while performing a diff for child nodes works as
> below
> # Get children for _before_ revision upto MANY_CHILDREN_THRESHOLD (which
> defaults to 50). Further note that current logic of fetching children nodes
> also add children {{NodeDocument}} to {{Document}} cache and also reads the
> complete Document for those children
> # Get children for _after_ revision with limits as above
> # If the child list is complete then it does a direct diff on the fetched
> children
> # if the list is not complete i.e. number of children are more than the
> threshold then it for a query based diff (also see OAK-1970)
> So in those cases where number of children are large then all work done in #1
> above is wasted and should be avoided. To do that we can mark those parent
> nodes which have many children via special flag like {{_manyChildren}}. One
> such nodes are marked the diff logic can check for the flag and skip the work
> done in #1
> This is kind of similar to way we mark nodes which have at least one child
> (OAK-1117)
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