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From "Valentin Kulichenko (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-941) Need to add read-only mode for transactional cache
Date Fri, 22 May 2015 20:28:18 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Valentin Kulichenko updated IGNITE-941:
---------------------------------------
    Summary: Need to add read-only mode for transactional cache  (was: Need to read-only mode
in transactional cache)

> Need to add read-only mode for transactional cache
> --------------------------------------------------
>
>                 Key: IGNITE-941
>                 URL: https://issues.apache.org/jira/browse/IGNITE-941
>             Project: Ignite
>          Issue Type: Bug
>          Components: cache
>    Affects Versions: sprint-4
>            Reporter: Valentin Kulichenko
>            Priority: Critical
>
> Transactional cache updates persistence store from client, but reads are done from the
primary node. So it's valid to use transactional cache on client for gets only even if there
is no DB access on client (which is often the case). This can be especially useful to utilize
near cache.
> Currently you can achieve this by removing store from client and disabling consistency
check, but it's not safe. Moreover, you can't disable the check only on client nodes, because
in this case you won't be able to start a new server node if there is a client in topology.
> I suggest to:
> * Add {{readOnly}} flag on cache configuration (disabled by default).
> * If flag is switched on, updates are not allowed.
> * Consistency check should accept read-only clients w/o store configured.
> I also think that if consistency check is disabled on one of the nodes, other nodes should
not check it (now they do).



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