Maintaining version history "created" timestamps when importing

[corey.schooler]

My team is currently in the process of migrating from Jackrabbit 1 to Modeshape.  We would like to maintain the version history from our out existing repository.   It appears that although the "created" properties are available in the Jackrabbit export, Modeshape does not persist this value and instead writes the current instant for the "created" value.  Is this the desired behavior?  Is there a way to get Modeshape to honor the values from the exported repository?

[hchiorean]

ModeShape does not support importing anything under the /jcr:system branch (from a system document), so this information cannot be migrated unfortunately.

[corey.schooler]

In my Modeshape instance, I see to see the following version information.

Printed section of the modeshape tree:

                    /jcr:system/jcr:versionStorage/b7/6b
                    6b
                         /jcr:system/jcr:versionStorage/b7/6b/a1
                         a1
                              /jcr:system/jcr:versionStorage/b7/6b/a1/b76ba1955d1340e70617625d22a96022e66f73bb
                              b76ba1955d1340e70617625d22a96022e66f73bb
                                   /jcr:system/jcr:versionStorage/b7/6b/a1/b76ba1955d1340e70617625d22a96022e66f73bb/jcr:rootVersion
                                   jcr:rootVersion
                                        /jcr:system/jcr:versionStorage/b7/6b/a1/b76ba1955d1340e70617625d22a96022e66f73bb/jcr:rootVersion/jcr:frozenNode
                                        jcr:frozenNode
                                             jcr:frozenMixinTypes: mix:versionable
                                             jcr:frozenPrimaryType: nt:unstructured
                                             jcr:frozenUuid: 15b89cf2-b248-4b60-bae2-eddb51e4ccb6
                                             jcr:primaryType: nt:frozenNode
                                             jcr:uuid: e60d4aa317f1e7d279714a-64d1-412a-8d6b-67a34a5b3579
                                        jcr:created: 2016-06-13T16:52:42.924-05:00
                                        jcr:primaryType: nt:version
                                        jcr:uuid: b9430a05-4228-4de6-9820-115405c40782
                                   /jcr:system/jcr:versionStorage/b7/6b/a1/b76ba1955d1340e70617625d22a96022e66f73bb/jcr:versionLabels
                                   jcr:versionLabels
                                        jcr:primaryType: nt:versionLabels
                                   jcr:primaryType: nt:versionHistory
                                   jcr:uuid: 15b89cf2-b248-4b60-bae2-eddb51e4ccb6
                                   jcr:versionableUuid: 15b89cf2-b248-4b60-bae2-eddb51e4ccb6
                              jcr:primaryType: mode:versionHistoryFolder
                         jcr:primaryType: mode:versionHistoryFolder

Is not related to the import here:

                    <sv:node sv:name="9c">
                        <sv:property sv:name="jcr:primaryType" sv:type="Name">
                            <sv:value>rep:versionStorage</sv:value>
                        </sv:property>
                        <sv:node sv:name="15b89cf2-b248-4b60-bae2-eddb51e4ccb6">
                            <sv:property sv:name="jcr:primaryType" sv:type="Name">
                                <sv:value>nt:versionHistory</sv:value>
                            </sv:property>
                            <sv:property sv:name="jcr:uuid" sv:type="String">
                                <sv:value>d1295184-f60a-419f-ba1f-3e9632757ee2</sv:value>
                            </sv:property>
                            <sv:property sv:name="jcr:versionableUuid" sv:type="String">
                                <sv:value>15b89cf2-b248-4b60-bae2-eddb51e4ccb6</sv:value>
                            </sv:property>
                            <sv:node sv:name="jcr:versionLabels">
                                <sv:property sv:name="jcr:primaryType" sv:type="Name">
                                    <sv:value>nt:versionLabels</sv:value>
                                </sv:property>
                            </sv:node>
                            <sv:node sv:name="jcr:rootVersion">
                                <sv:property sv:name="jcr:primaryType" sv:type="Name">
                                    <sv:value>nt:version</sv:value>
                                </sv:property>
                                <sv:property sv:name="jcr:uuid" sv:type="String">
                                    <sv:value>01b78452-682b-4800-a061-f9727931c0b3</sv:value>
                                </sv:property>
                                <sv:property sv:name="jcr:created" sv:type="Date">
                                    <sv:value>2016-06-13T09:28:41.668-05:00</sv:value>
                                </sv:property>
                                <sv:property sv:name="jcr:predecessors" sv:type="Reference"/>
                                <sv:property sv:name="jcr:successors" sv:type="Reference">
                                    <sv:value>2c0a2aae-1d07-415d-9ada-4ec144464693</sv:value>
                                </sv:property>
                                <sv:node sv:name="jcr:frozenNode">
                                    <sv:property sv:name="jcr:primaryType" sv:type="Name">
                                        <sv:value>nt:frozenNode</sv:value>
                                    </sv:property>
                                    <sv:property sv:name="jcr:uuid" sv:type="String">
                                        <sv:value>bb27d1fd-61bf-416d-b576-c585a79a9590</sv:value>
                                    </sv:property>
                                    <sv:property sv:name="jcr:frozenMixinTypes" sv:type="Name">
                                        <sv:value>mix:versionable</sv:value>
                                    </sv:property>
                                    <sv:property sv:name="jcr:frozenPrimaryType" sv:type="Name">
                                        <sv:value>nt:unstructured</sv:value>
                                    </sv:property>
                                    <sv:property sv:name="jcr:frozenUuid" sv:type="String">
                                        <sv:value>15b89cf2-b248-4b60-bae2-eddb51e4ccb6</sv:value>
                                    </sv:property>
                                </sv:node>
                            </sv:node>
                            <sv:node sv:name="1.0">
                                <sv:property sv:name="jcr:primaryType" sv:type="Name">
                                    <sv:value>nt:version</sv:value>
                                </sv:property>
                                <sv:property sv:name="jcr:uuid" sv:type="String">
                                    <sv:value>2c0a2aae-1d07-415d-9ada-4ec144464693</sv:value>
                                </sv:property>
                                <sv:property sv:name="jcr:created" sv:type="Date">
                                    <sv:value>2016-06-13T09:28:41.826-05:00</sv:value>
                                </sv:property>
                                <sv:property sv:name="jcr:predecessors" sv:type="Reference">
                                    <sv:value>01b78452-682b-4800-a061-f9727931c0b3</sv:value>
                                </sv:property>
                                <sv:property sv:name="jcr:successors" sv:type="Reference"/>
                                <sv:node sv:name="jcr:frozenNode">
                                    <sv:property sv:name="jcr:primaryType" sv:type="Name">
                                        <sv:value>nt:frozenNode</sv:value>
                                    </sv:property>
                                    <sv:property sv:name="jcr:uuid" sv:type="String">
                                        <sv:value>deac6be7-c76e-4a3a-959d-76ad19e70bbe</sv:value>
                                    </sv:property>
                                    <sv:property sv:name="jcr:frozenMixinTypes" sv:type="Name">
                                        <sv:value>mix:versionable</sv:value>
                                    </sv:property>
                                    <sv:property sv:name="jcr:frozenPrimaryType" sv:type="Name">
                                        <sv:value>nt:unstructured</sv:value>
                                    </sv:property>
                                    <sv:property sv:name="jcr:frozenUuid" sv:type="String">
                                        <sv:value>15b89cf2-b248-4b60-bae2-eddb51e4ccb6</sv:value>
                                    </sv:property>
                                    <sv:property sv:name="jcr:predecessors" sv:type="Reference">
                                        <sv:value>01b78452-682b-4800-a061-f9727931c0b3</sv:value>
                                    </sv:property>
                                    <sv:property sv:name="jcr:versionHistory" sv:type="Reference">
                                        <sv:value>d1295184-f60a-419f-ba1f-3e9632757ee2</sv:value>
                                    </sv:property>
                                </sv:node>
                            </sv:node>
                        </sv:node>
                    </sv:node>

The tree output above is related only to the history from the newly created node in Modeshape and is not related to the history imported from Jackrabbit?

[hchiorean]

The tree output above is related only to the history from the newly created node in Modeshape and is not related to the history imported from Jackrabbit?

that is correct. ModeShape ignores everything under the /jcr:system area when importing system-view exports. You can see a discussion as to why we're not doing this on this issue for example: [MODE-1864] Be able to import/export versionable node with its version history - JBoss Issue Tracker

[corey.schooler]

Thanks for the clarification.

[reggie.yu]

I've read MODE-1864, and this particular comment seems to imply that ModeShape's backup and restore functionality will preserve version history data.

Can the restore functionality be used to "import" versioned nodes and their history into a blank ModeShape repository?

(assuming that the Jackrabbit data was exported into a format that is readable by ModeShape's restore functionality)

[hchiorean]

Backup & restore (Backup and restore - ModeShape 5 - Project Documentation Editor) are a ModeShape-specific feature meant to allow migration between major versions of ModeShape, where the persistent storage format might have changed. This is not related in any way to JCR's import/export feature and document/system view. And yes, when doing a ModeShape backup/restore the entire repository data (including system content) is restored.

To answer your question, if someone were to export Jackrabbit data as the JSON documents which ModeShape's restore expects, then yes, you could "restore" JR data into ModeShape. But I'm not aware of such functionality existing out there atm.

[reggie.yu]

Thanks for the response, that answers my questions!