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From "Alex Parvulescu (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (OAK-1877) Hourly async reindexing on an idle instance
Date Mon, 16 Jun 2014 14:24:02 GMT

     [ https://issues.apache.org/jira/browse/OAK-1877?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Alex Parvulescu resolved OAK-1877.

    Resolution: Fixed

changed the patch a bit, talked to Jukka and we've decided to keep the latest checkpoint and
simply update the ref to it, instead of keeping the old one (good for gc reasons too).

Marking as fixed, on trunk with rev http://svn.apache.org/r1602872, on 1.0 with rev 1602874.

> Hourly async reindexing on an idle instance
> -------------------------------------------
>                 Key: OAK-1877
>                 URL: https://issues.apache.org/jira/browse/OAK-1877
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.0
>            Reporter: Jukka Zitting
>            Assignee: Jukka Zitting
>            Priority: Critical
>             Fix For: 1.0.1, 1.1
>         Attachments: updates-without-indexed-changes.patch
> OAK-1292 introduced the following interesting but not very nice behavior:
> On an idle system with no changes for an extended amount of time, the OAK-1292 change
blocks the async indexer from updating the reference to the last indexed checkpoint. After
one hour (the default checkpoint lifetime), the referenced checkpoint will expire, and the
indexer will fall back to full reindexing.
> The result of this behavior is that once every hour, the size of an idle instance will
grow with dozens or hundreds of megabytes of new index data generated by reindexing. Older
index data becomes garbage, but the compaction code from OAK-1804 is needed to make it collectable.
A better solution would be to prevent the reindexing from happening in the first place.

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