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From karensmolermiller <...@git.apache.org>
Subject [GitHub] geode pull request #544: GEODE-2994 Take backups when region ops are quiesce...
Date Wed, 31 May 2017 21:40:04 GMT
Github user karensmolermiller commented on a diff in the pull request:

    https://github.com/apache/geode/pull/544#discussion_r119481045
  
    --- Diff: geode-docs/managing/disk_storage/backup_restore_disk_store.html.md.erb ---
    @@ -38,6 +38,15 @@ Do not try to create backup files from a running system by using your
operating
     **Preparing to Make a Backup**
     
     -   Consider compacting your disk store before making a backup. If auto-compaction is
turned off, you may want to do a manual compaction to save on the quantity of data copied
over the network by the backup. For more information on configuring a manual compaction, see
[Manual Compaction](compacting_disk_stores.html#compacting_disk_stores__li_63CF8C35153D4173AADF7DC35FEC61F9).
    +-   Take the backup when region operations are quiescent,
    +to avoid the possibility of an inconsistency between region data and
    +an asyncronous event queue (AEQ),
    +if that backup were to be used to restore a system.
    +The AEQ is persistent.
    +If a backup is unlucky enough to be taken between
    +a persisted write to a region (causing a disk operation)
    +and the resulting persisted write to the AEQ (causing a disk operation),
    +then the backup represents inconsistent data in the region and the AEQ.
    --- End diff --
    
    Could you please create a new JIRA if you want to refine the restoration procedure?  I
think that we ought to be much more specific about how to destroy any queue.
    
    I'd like this JIRA to just make sure to warn users about the possibility of inconsistency
in their backups.


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