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From "Marcel Reutegger (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JCR-2216) Append-only index updates
Date Wed, 05 Aug 2009 15:05:14 GMT

     [ https://issues.apache.org/jira/browse/JCR-2216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Marcel Reutegger updated JCR-2216:

       Resolution: Fixed
    Fix Version/s: 2.0.0
           Status: Resolved  (was: Patch Available)

Committed most recent patch in revision: 801253

Index segment information and redo logs are now write once and append only. That is both now
have a generation suffix. E.g. you might now see files like: indexes_13 and redo_13.log

The indexes file references the persistent index segment, while the associated redo log contains
the changes on top of them that are not currently flushed to disk.

There is a new parameter maxHistoryAge, which tells the index for how long it should keep
past index commit points (basically the indexes_<gen> and possibly unused the index
segments it references). The default value is zero, which means past index commit points are
deleted immediately.

> Append-only index updates
> -------------------------
>                 Key: JCR-2216
>                 URL: https://issues.apache.org/jira/browse/JCR-2216
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core
>            Reporter: Marcel Reutegger
>             Fix For: 2.0.0
>         Attachments: JCR-2216.patch, JCR-2216.patch, JCR-2216.patch, JCR-2216.patch
> Currently index updates modify some existing files. This is troublesome in scenarios
like a backup or when an index will be shared in a cluster (though this is not yet the case).
> Requirements are:
> - index segments need a custom (lucene) IndexDeletionPolicy to keep index commits for
a given time.
> - index segments are not only referenced by their name, but also with their generation
> - the segments file must now also record the generation of a segment. the file itself
must be generational itself.
> - purging of outdated index segment commits

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