Chetan Mehrotra created OAK-2492:
------------------------------------
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)
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
