Marcel Reutegger created OAK-1044: ------------------------------------- Summary: Reduce traffic between MongoMK and MongoDB Key: OAK-1044 URL: https://issues.apache.org/jira/browse/OAK-1044 Project: Jackrabbit Oak Issue Type: Improvement Components: core, mongomk Reporter: Marcel Reutegger
There is quite some redundant traffic going on between MongoMK and MongoDB, which can have a major impact on performance. One of the problems we already saw in the past when there are many changes on a node. The document in MongoDB grows and with every modification to the node the cost increases because MongoMK always requests the complete old document from MongoDB in the response. This is done for several reasons: 1) MongoMK looks at the returned old document and checks if the updates applied do not conflict. 2) MongoMK updates its cache with the old document and the updates it applied. Splitting the documents when they reach a certain size keeps the cost for an update within bounds, but most of the time the response just contains redundant information already present in MongoMK. E.g. when no other MongoMK instance modified the node, the returned document is the same as the one potentially already in the cache. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira