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https://issues.apache.org/jira/browse/GEODE-2994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16032069#comment-16032069
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ASF GitHub Bot commented on GEODE-2994:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/geode/pull/544


> Doc task: interactions of backups with persistence
> --------------------------------------------------
>
>                 Key: GEODE-2994
>                 URL: https://issues.apache.org/jira/browse/GEODE-2994
>             Project: Geode
>          Issue Type: Improvement
>          Components: docs
>            Reporter: Karen Smoler Miller
>            Assignee: Karen Smoler Miller
>
> Document that an inconsistent state can occur by using a backup to restore 
> system state, if the backup is made at the wrong time.
> There are 2 examples where persistence and taking a backup might cause an 
> inconsistency with region data, if that backup is used to restore a system.
> # *A Lucene index.* The Lucene index is persistent. If a backup is unlucky 
> enough to be taken between a persisted write to a region (disk op) and a 
> persisted write to the Lucene index (disk op), then the backup represents 
> inconsistent data in the region and Lucene index.
> # *An AEQ.* The AEQ is persistent. If a backup is unlucky enough to be taken 
> between a persisted write to a region (disk op) and a persisted write to the 
> AEQ (disk op), then the backup represents inconsistent data in the region and 
> the AEQ.
> The solution is to make sure that backups are taken when the system is 
> quiescent WRT region operations.



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