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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] Commented: (JCR-2549) Node#getNodes can cause many server round trips
Date Mon, 08 Mar 2010 14:18:27 GMT

    [ https://issues.apache.org/jira/browse/JCR-2549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12842670#action_12842670
] 

Michael Dürig commented on JCR-2549:
------------------------------------

The fundamental problem here is that, the SPI implementations makes some assumption on the
client's requirements when passing back a batch. In this case the assumption is, that whenever
the client reads a node, it will most likely also read some of its child items later on. However,
in the above case this assumption is wrong. Instead of the children of a given node, subsequent
read target the *siblings* of that node.

To fix this, we need a mechanism to send hints about what to include in a batch to the SPI
(i.e. children of the target node vs. siblings of the target node in the above  case).


  

> Node#getNodes can cause many server round trips
> -----------------------------------------------
>
>                 Key: JCR-2549
>                 URL: https://issues.apache.org/jira/browse/JCR-2549
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-jcr2spi
>    Affects Versions: 2.1.0
>            Reporter: Michael Dürig
>
> The call to Node#getNodes sometimes causes many server round trips:
> Assume the spi implementation (for example DavEx) is configured for batch reading with
a depth 3:
> Node c = session.getNode(/a/b/c)
> c.getNodes()
> the getNodes call on c causes a round trip to the server for each child of c since c
itself is in the cache but with the depth of 3 none of its children is in the cache.  

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