Marcel Reutegger created OAK-1471:
-------------------------------------
Summary: Mod count in permission store requires cluster wide
synchronization
Key: OAK-1471
URL: https://issues.apache.org/jira/browse/OAK-1471
Project: Jackrabbit Oak
Issue Type: Bug
Components: core
Reporter: Marcel Reutegger
Fix For: 0.18
The current permission store implementation keeps a mod count property on some
of the nodes to detect changes and update/invalidate a cache when required. In
general this introduces a contention point when there are concurrent
modifications of access control entries for a given user. Those concurrent
changes may introduce conflicts and commits may have to be retried after a
rebase. This still works somewhat OK when there is just a single oak instance,
because both segment and document store implementation will eventually fall
back to locking and serialize the commits. However, it does not work well in a
cluster, unless we apply the same locking cluster wide.
See also discussion here:
http://markmail.org/message/k64udmgc3ctaqmn2
--
This message was sent by Atlassian JIRA
(v6.1.5#6160)
