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From "Andrei Dulceanu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-7672) Introduce oak-run segment-copy for moving around segments in different storages
Date Wed, 01 Aug 2018 11:35:00 GMT
Andrei Dulceanu created OAK-7672:
------------------------------------

             Summary: Introduce oak-run segment-copy for moving around segments in different
storages
                 Key: OAK-7672
                 URL: https://issues.apache.org/jira/browse/OAK-7672
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: oak-run, segment-tar
            Reporter: Andrei Dulceanu
            Assignee: Andrei Dulceanu
             Fix For: 1.10, 1.9.7


Often there's the need to transform a type of {{SegmentStore}} (e.g. local TarMK) into *the
exact same* counter-part, using another persistence type (e.g. Azure Segment Store). While
{{oak-upgrade}} partially solves this through sidegrades (see OAK-7623), there's a gap in
the final content because of the level at which {{oak-upgrade}} operates (node store level).
Therefore, the resulting sidegraded repository doesn't contain all the (possibly stale, unreferenced)
data from the original repository, but only the latest head state. A side effect of this is
that the resulting repository is always compacted.

Introducing a new command in {{oak-run}}, namely {{segment-copy}} would allow us to operate
at a lower level (i.e. segment persistence), dealing only with constructs from {{org.apache.jackrabbit.oak.segment.spi.persistence}}:
journal file, archives and archive entries. This way the only focus of this process would
be to "translate" a segment between two persistence formats, without caring about the node
logic stored inside (referenced/unreferenced node/property).



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