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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Commented] (OAK-7416) Contribute a 'proc' subtree for the Segment Node Store
Date Wed, 18 Apr 2018 10:31:00 GMT

    [ https://issues.apache.org/jira/browse/OAK-7416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16442242#comment-16442242

Michael Dürig commented on OAK-7416:

[~frm], I just went to the proposed changes. This looks very good to me and I'd be +1 to applying 
this in trunk.
 * See [https://github.com/francescomari/jackrabbit-oak/pull/18/files] for some proposed changes
to clean up a few bits.
 * The classes in {{org.apache.jackrabbit.oak.segment.file.proc}} generally lack Javadoc.
No blocker for trunk, but let's add some class level comments re. what the structure of what
the individual classes as long as our memories are still fresh.

> Contribute a 'proc' subtree for the Segment Node Store
> ------------------------------------------------------
>                 Key: OAK-7416
>                 URL: https://issues.apache.org/jira/browse/OAK-7416
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: segment-tar
>            Reporter: Francesco Mari
>            Assignee: Francesco Mari
>            Priority: Major
>              Labels: tooling
>             Fix For: 1.10
> With guidance from [~mduerig], I recently developed a way to expose Segment Node Store's
internal information through the NodeState API. 
> The concept is similar in spirit to the proc file system in Linux: the proc subtree exposes
internal information in a straightforward manner, enabling consumers to rely on a well-understood
API to access the data. This proc subtree shelters tooling from variations of the internal
APIs of the Segment Store. As long as the data exported through the proc subtree is stable,
the same tools are going to work across different versions of the Segment Store with minimal
to no modifications.
> The proc subtree has been developed in [this branch on GitHub|https://github.com/francescomari/jackrabbit-oak/tree/proc].
I created this issue in order to review the work done so far, and to track the contribution
of the proc subtree in Oak.

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