Chetan Mehrotra created OAK-5924:
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Summary: Prevent long running query from delaying close of index
Key: OAK-5924
URL: https://issues.apache.org/jira/browse/OAK-5924
Project: Jackrabbit Oak
Issue Type: Improvement
Components: lucene
Reporter: Chetan Mehrotra
Assignee: Chetan Mehrotra
Fix For: 1.8
Whenever the index gets updated {{IndexTracker}} detects the changes and open
new {{IndexNode}} and closes old index nodes. This flow would block untill all
old IndexNode are closed.
IndexNode close itself relies on a writer lock. It can happen that a long
running query i.e. a query which is about to read a page of large is currently
executing on the old IndexNode instance. This query is trying load 100k docs
and is very slow (due to loading of excerpt) then such a query would prevent
the IndexNode from getting closed. This in turn would prevent the index from
seeing latest data and become stale.
To make query and indexing more resilient we should look if current IndexNode
being used for query is closing or not. If closing then query should open a
fresh searcher
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