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Posted to oak-issues@jackrabbit.apache.org by "Michael Marth (JIRA)" <ji...@apache.org> on 2015/04/29 20:30:07 UTC
[jira] [Updated] (OAK-2106) Optimize reads from secondaries
[ https://issues.apache.org/jira/browse/OAK-2106?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Marth updated OAK-2106:
-------------------------------
Labels: performance scalability (was: )
> Optimize reads from secondaries
> -------------------------------
>
> Key: OAK-2106
> URL: https://issues.apache.org/jira/browse/OAK-2106
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: core, mongomk
> Reporter: Marcel Reutegger
> Assignee: Marcel Reutegger
> Labels: performance, scalability
> Fix For: 1.3.0
>
>
> OAK-1645 introduced support for reads from secondaries under certain
> conditions. The current implementation checks the _lastRev on a potentially
> cached parent document and reads from a secondary if it has not been
> modified in the last 24 hours. This timespan is somewhat arbitrary but
> reflects the assumption that the replication lag of a secondary shouldn't
> be more than 24 hours.
> This logic should be optimized to take the actual replication lag into
> account. MongoDB provides information about the replication lag with
> the command rs.status().
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