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https://issues.apache.org/jira/browse/OAK-5030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15612389#comment-15612389
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Michael Dürig commented on OAK-5030:
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The reason for the slowness and the growth is how the {{versionStorage}} node
builder in {{VersionableEditor}} is used: its {{getNodeState()}} method is
called very frequently inside {{VersionableEditor.isVersionHistoryExists()}}.
This isn't the intended use case for node builders as their {{getNodeState()}}
method is not optimised for read performance and might have side effects. In
the case of the {{SegmentNodeBuilder}} it flushed pending changes to disk (thus
the growths and the slowness).
> Copying the versions store is slow and increase the repository size
> -------------------------------------------------------------------
>
> Key: OAK-5030
> URL: https://issues.apache.org/jira/browse/OAK-5030
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: upgrade
> Reporter: Michael Dürig
> Labels: perfomance
> Fix For: 1.5.13
>
>
> This is a follow up to OAK-4970: when defining an workspace name that doesn't
> match the name of the workspace of the source repository (via the
> {{WORKSPACE_NAME_PROP}} system property), upgrading is still very slow and
> causes the repository size to grow way too much.
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