[jira] Updated: (LUCENE-1073) Add unit test showing how to do a "live backup" of an index

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless updated LUCENE-1073:
---------------------------------------

    Attachment: LUCENE-1073.patch

Attached patch that has a class (SnapshotDeletionPolicy) plus a unit
test (TestSnapshotDeletionPolicy) showing how to use it to do a live
backup.

I also added a new public method "getFileNames()" to IndexCommitPoint
(getting the filenames would otherwise requires package private access
to SegmentInfo/s).

All tests pass.  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
>
>
> 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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