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  1. Jackrabbit Content Repository
  2. JCR-3534

Efficient copying of binaries across repositories with the same data store




      we have a couple of use cases, where we would like to leverage the global data store to prevent sending around and copying around large binary data unnecessarily: We have two separate Jackrabbit instances configured to use the same DataStore (for the sake of this discussion assume we have the problems of concurrent access and garbage collection under control). When sending content from one instance to the other instance we don't want to send potentially large binary data (e.g. video files) if not needed.

      The idea is for the sender to just send the content identity from JackrabbitValue.getContentIdentity(). The receiver would then check whether the such content already exists and would reuse if so:

      String ci = contentIdentity_from_sender;
      try {
      Value v = session.getValueByContentIdentity(ci);
      Property p = targetNode.setProperty(propName, v);
      } catch (ItemNotFoundException ie) {
      // unknown or invalid content Identity
      } catch (RepositoryException re) {
      // some other exception

      Thus the proposed JackrabbitSession.getValueByContentIdentity(String) method would allow for round tripping the JackrabbitValue.getContentIdentity() preventing superfluous binary data copying and moving.

      See also the dev@ thread http://jackrabbit.markmail.org/thread/gedk5jsrp6offkhi


        1. JCR-3534.2.patch
          25 kB
          Tommaso Teofili
        2. JCR-3534.26.patch
          27 kB
          Tommaso Teofili
        3. JCR-3534.3.patch
          32 kB
          Tommaso Teofili
        4. JCR-3534.4.patch
          24 kB
          Tommaso Teofili
        5. JCR-3534.6.patch
          2 kB
          Tommaso Teofili
        6. JCR-3534.7.patch
          10 kB
          Tommaso Teofili
        7. JCR-3534.patch
          24 kB
          Tommaso Teofili
        8. JCR-3534.patch
          12 kB
          Felix Meschberger

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              teofili Tommaso Teofili
              fmeschbe Felix Meschberger
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