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https://issues.apache.org/jira/browse/OAK-3163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14645982#comment-14645982
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Julian Sedding edited comment on OAK-3163 at 7/29/15 12:45 PM:
---------------------------------------------------------------
Attached patch that leverages the content-identity comparison in
{{AbstractBlob#equal}}. This speeds up comparison of binaries and thus the
upgrade of repositories with a significant amount of binaries.
The copy-phase while incrementally upgrading a repository with 2.6mio nodes was
4x faster with this patch (43min vs 10min).
was (Author: jsedding):
Attached patch that leverages the content-identity comparison in
{{AbstractBlob#equal}}. This speeds up comparison of binaries and thus the
upgrade of repositories with a significant amount of binaries.
> Improve binary comparison during repeated upgrades
> --------------------------------------------------
>
> Key: OAK-3163
> URL: https://issues.apache.org/jira/browse/OAK-3163
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: upgrade
> Affects Versions: 1.2.3, 1.3.3
> Reporter: Julian Sedding
> Labels: performance
> Attachments: OAK-3163.patch
>
>
> OAK-2619 introduced the possibility to run the same upgrade repeatedly and
> achieve incremental upgrades. This reduces the time taken for {{CommitHook}}
> processing, because the diff is reduced.
> However, for incremental upgrades to be really useful, the content-copy phase
> needs to be fast. Currently an optimization that was proposed in OAK-2626 was
> lost due to the implementation of a better solution to some part of the
> problem.
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