Marcel Reutegger created OAK-2562:
-------------------------------------
Summary: DiffCache is inefficient
Key: OAK-2562
URL: https://issues.apache.org/jira/browse/OAK-2562
Project: Jackrabbit Oak
Issue Type: Bug
Components: core, mongomk
Affects Versions: 1.0
Reporter: Marcel Reutegger
Assignee: Marcel Reutegger
The diffCache in DocumentNodeStore can be quite inefficient in some cases. It
may become ineffective even for rather recent commits.
The diffCache contains entries for changes of a commit. E.g. it may have an
entry that says between revision r7-0-1 and r8-0-1 the following happened under
/foo: 'bar' was modified, 'baz' was added, etc. The problem now is, that the
revision range in the diffCache refers to the revision of the commit and its
base version, whereas on runtime, the diff calls may likely happen for other
revision ranges. The further down the tree the node state comparison happens,
the more likely it is that the base state has a different revision than the
entry in the cache. The DocumentNodeStore attempts to 'link' node states back
in time to avoid reading the complete tree at a different revision after each
commit.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
