Chetan Mehrotra created OAK-5434:
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Summary: 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
Fix For: 1.8
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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