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https://issues.apache.org/jira/browse/OAK-5434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chetan Mehrotra updated OAK-5434:
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Fix Version/s: (was: 1.8)
> Skip processing of queued changes if async index update is detected in
> ExternalIndexObserver
> --------------------------------------------------------------------------------------------
>
> Key: OAK-5434
> URL: https://issues.apache.org/jira/browse/OAK-5434
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: lucene
> Reporter: Chetan Mehrotra
> Assignee: Chetan Mehrotra
> Labels: performance
>
> ExternalIndexObserver is currently backed by a queue (its wrapped in
> BackgroundObserver). Currently it processed the changes one by one as
> received from the queue. If this processing takes long time then its possible
> that it would lag behind the async indexing cycle.
> So ExternalIndexObserver may be busy indexing changes from [r1-r2] but async
> indexing is already done indexing changes upto r3 (r3 > r2) and IndexTracker
> would move to newer index version. In such case work done by
> ExternalIndexObserver is wasted.
> This can be optimized by ensuring that ExternalIndexObserver can see the
> lastIndexTo of :async as per latest entry in queue. If that is newer than one
> its processing then it can skip processing the queue entry and thus free up
> space in queue
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