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From "Julian Reschke (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-3189) CLONE - MissingLastRevSeeker non MongoDS may fail with OOM
Date Thu, 06 Aug 2015 13:06:04 GMT
Julian Reschke created OAK-3189:

             Summary: CLONE - MissingLastRevSeeker non MongoDS may fail with OOM
                 Key: OAK-3189
                 URL: https://issues.apache.org/jira/browse/OAK-3189
             Project: Jackrabbit Oak
          Issue Type: Task
          Components: core
    Affects Versions: 1.1.0
            Reporter: Julian Reschke
            Assignee: Julian Reschke
             Fix For: 1.1.2

This code currently has a hardwired optimization for MongoDB (returning an Iterable over a
DBCursor). For all other persistences, a java List of all matching NodeDocuments will be built.

I see two ways to address this:

1) Generalize the Mongo approach, where a query to the persistence can return a live iterator,

2) Stick with the public DS API, but leverage paging (get N nodes at once, and then keep calling
query() again with the right starting ID).

2) sounds simpler, but is not transactional; [~mreutegg] would that be sufficient?

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