hi I haven't used jackrabbit with a huge amount of data yet but I did run some tests and have some impressions I'd like to share, hopefully someone will correct me if I'm misleading you.
In most cases I agree with David and Marcel, who pointed that jackrabbit doesn't seem to affected by the number of nodes. However, I think that in order to maintain the performance you should take into account some considerations on the usage that might affect it seriously. Regarding the tree structure. Since each parent holds references to its children each time you add a child the parent becomes heavier. It causes a degradation in performance for write operations according to the number of children. I think it's better to use a deep hierarchy rather than a flat structure. I would recommend you to do some testing to establish the limits that suits your needs. Regarding the session handling. A transient item storage is bound to each session. The transient storage contains its own cache of nodes that are connected to the underlying persistent storage. The thing is that each time a node is modified, all the cached transient nodes are notified. Therefore the more open sessions you have the more expensive the write operation will be. I think you should try each session to perform write operations on nodes which are not under heavy load from other sessions. e.g. I think it's good practice to avoid write operations in the root node if the repository is to be accessed by a high number of sessions. I also think that it's a good practice to share a single anonymous session for read only access if possible, it would reduce the time that write actions will take. Regarding concurrency. Currently jackrabbit lacks fine grained locking for write operations. So, if the repository will be under heavy load I would consider an approach like the one used in Magnolia, I'm not sure if they still use it but the last time I checked they had a repository for authoring and another for publishing. br, edgar On 10/12/05, Eugeny N Dzhurinsky <[EMAIL PROTECTED]> wrote: > Hi there! > We are developing CMS, and we need to learn a bit more about the performance > of JackRabbit. The thing is I didn't find anything about the performance > neither in wiki, nor in documentation, > > To be more specific, we are wandering about the performance JackRabbit > could have, for example, working with several hundred thousands > nodes/properties > and very deep nodes tree? > > -- > Eugene N Dzhurinsky >
