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From "Amit Jain (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OAK-2106) Optimize reads from secondaries
Date Tue, 01 Sep 2015 05:48:46 GMT

     [ https://issues.apache.org/jira/browse/OAK-2106?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amit Jain updated OAK-2106:
---------------------------
    Fix Version/s:     (was: 1.3.8)
                   1.3.6

> 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: 1.3.6
>
>
> 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 6 hours. This timespan is somewhat arbitrary but
> reflects the assumption that the replication lag of a secondary shouldn't
> be more than 6 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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