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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