Michael Dürig created OAK-1056:
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Summary: Transient changes contributed by commit hooks are kept in
memory
Key: OAK-1056
URL: https://issues.apache.org/jira/browse/OAK-1056
Project: Jackrabbit Oak
Issue Type: Improvement
Components: core
Reporter: Michael Dürig
With the {{KernelNodeStore}}, transient changes contributed by commit hooks are
currently kept in memory instead of being written ahead to the private branch.
The reason for this is that we need to be able to undo such changes if a commit
hook later in the process fails the commit. Doing this efficiently would need
some support from the persistent layer. Either the ability for branching from a
branch or the ability to roll back to a previous state.
See the TODOs in {{KernelNodeState.builder()}}, which returns a
MemoryNodeBuilder (instead of a KernelNodeBuilder when the current state is on
a branch. This is the workaround to avoid branching form a branch and has the
effect that commit hooks currently run against a MemoryNodeBuilder and limits
the amount of changes commit hooks can add.
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