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Posted to oak-issues@jackrabbit.apache.org by "Marcel Reutegger (JIRA)" <ji...@apache.org> on 2016/07/26 16:01:20 UTC

[jira] [Created] (OAK-4605) Separate persistent cache for diff and local_diff

Marcel Reutegger created OAK-4605:
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             Summary: Separate persistent cache for diff and local_diff
                 Key: OAK-4605
                 URL: https://issues.apache.org/jira/browse/OAK-4605
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: core, documentmk
            Reporter: Marcel Reutegger
            Assignee: Marcel Reutegger
             Fix For: 1.6


The DocumentNodeStore currently uses a single persistent cache for all types (node, nodeChildren, diff, etc.). With this setup it is not possible to assign a specific amount of disk space for some cache type(s). If there are many inserts for one cache type, entries of another type may become unavailable. In practice this can be a problem for the local_diff cache entries that are important for efficient node state comparison.

Separating the diff and local_diff cache entries would also allow for different configuration options like compression and different behaviour when the async write back queue is full.



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