[jira] [Created] (OAK-2492) Flag Document having many children

["Chetan Mehrotra (JIRA)" <ji...@apache.org>]

Chetan Mehrotra created OAK-2492:
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             Summary: 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
             Fix For: 1.0.12, 1.1.7


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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