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https://issues.apache.org/jira/browse/LUCENE-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-1073:
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Attachment: LUCENE-1073.take3.patch
Thanks for reviewing Michael!
{quote}
Maybe we should add SnapshotDeletionPolicy to the core (now it's an
inner class in the test case). I bet people would like to use it when
they implement backup functionalities in their apps.
{quote}
OK I think that makes sense.
I also found & fixed some thread safety issues with the test and added
a missing synchronized in DocumentsWriter that the test uncovered.
Attached new patch with these changes. I plan to commit in a day or
two.
> Add unit test showing how to do a "live backup" of an index
> -----------------------------------------------------------
>
> Key: LUCENE-1073
> URL: https://issues.apache.org/jira/browse/LUCENE-1073
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Examples
> Affects Versions: 2.2
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 2.3
>
> Attachments: LUCENE-1073.patch, LUCENE-1073.take2.patch,
> LUCENE-1073.take3.patch
>
>
> The question of how to backup an index comes up every so often on the
> lists. Backing up and index is also clearly an important fundamental
> admin task that many applications need to do for fault tolerance.
> In the past you were forced to stop & block all changes to your index,
> perform the backup, and then resume changes. But many applications
> cannot afford a potentially long pause in their indexing.
> With the addition of DeletionPolicy (LUCENE-710), it's now possible to
> do a "live backup", which means backup your index in the background
> without pausing ongoing changes to the index. This
> SnapshotDeletionPolicy just has to mark the chosen commit point as not
> deletable, until the backup finishes.
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