[jira] [Updated] (OAK-2669) Use Consolidated diff for local changes with persistent cache to avoid calculating diff again

["Chetan Mehrotra (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-2669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chetan Mehrotra updated OAK-2669:
---------------------------------
    Attachment: OAK-2669-benchmark.patch

Benchmark modelled on ObservationTest but simulates a workflow like scenario

> Use Consolidated diff for local changes with persistent cache to avoid calculating diff again
> ---------------------------------------------------------------------------------------------
>
>                 Key: OAK-2669
>                 URL: https://issues.apache.org/jira/browse/OAK-2669
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: mongomk
>            Reporter: Chetan Mehrotra
>             Fix For: 1.3.0
>
>         Attachments: OAK-2669-A.patch, OAK-2669-benchmark.patch
>
>
> Currently the diff logic in DocumentMK makes use of DiffCache which has an in memory implementation and a Mongo based implementation. Given that we need to have a fast observation support for local changes it would be better to make use of persistent cache. After discussing with [~mreutegg] following changes need to be done in current logic
> # Have the Commit#applyChanges push the commit diff to persistent cache with current commit revision as key
> # In compare pull out the diff from persistent cache and if present use that. Note that this diff is for complete tree compared to current JSOP diff used which is only per node level. So need to change the way diff is pushed back to NodeStateDiff
> Above change should avoid hitting mongo all together for determining the diff. Only extra work performed in diff calculation would be determining the node state view for the base revision. Later we can think of also include node state base revision as part of diff so as to avoid this extra work all together and rely on node state from persistent cache for that work also
> See also http://markmail.org/thread/bzmwcp7k4wmtw6od



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