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Posted to oak-issues@jackrabbit.apache.org by "Chetan Mehrotra (JIRA)" <ji...@apache.org> on 2014/09/18 09:55:33 UTC

[jira] [Commented] (OAK-2106) Optimize reads from secondaries

    [ https://issues.apache.org/jira/browse/OAK-2106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14138662#comment-14138662 ] 

Chetan Mehrotra commented on OAK-2106:
--------------------------------------

OAK-1750 is somewhat related to that and proposes an approach we can take to determine the replication lag in a more accurate way

> 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
>
> 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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