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https://issues.apache.org/jira/browse/OAK-6066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16259113#comment-16259113
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Tomek Rękawek commented on OAK-6066:
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Fixed for trunk in [r1815789|https://svn.apache.org/r1815789].
> Migration of binaries relies on implementation details of the TarMK
> -------------------------------------------------------------------
>
> Key: OAK-6066
> URL: https://issues.apache.org/jira/browse/OAK-6066
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: upgrade
> Reporter: Michael Dürig
> Assignee: Tomek Rękawek
> Labels: migration, tooling
> Fix For: 1.8, 1.7.12
>
> Attachments: OAK_6066.patch
>
>
> This was uncovered with the work on OAK-6051.
> On {{NodeStore.merge()}} the TarMK uses {{SegmentNodeState#fastEquals}} to
> efficiently determine whether there is something to commit and whether the
> base state changed since the builder about to commit was acquired. For
> efficiency reasons {{fastEquals}} can return "false negatives". AFAIU
> migration of binaries depends on this implementation detail because without
> this optimisation migration fails. ({{SegmentToExternalMigrationTest}} and
> {{ExternalToExternalMigrationTest}} fail).
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