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From "Chetan Mehrotra (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (OAK-5924) Prevent long running query from delaying refresh of index
Date Mon, 20 Nov 2017 11:21:00 GMT

     [ https://issues.apache.org/jira/browse/OAK-5924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chetan Mehrotra updated OAK-5924:
---------------------------------
    Fix Version/s:     (was: 1.8)
                   1.10

> Prevent long running query from delaying refresh 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: 1.10
>
>
> 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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