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https://issues.apache.org/jira/browse/OAK-6622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16155153#comment-16155153
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Chetan Mehrotra commented on OAK-6622:
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This default behaviour is bit counterintutive [1].
[1] https://stackoverflow.com/q/19528304
> Configure default core pool size for thread pool used by oak-lucene
> -------------------------------------------------------------------
>
> Key: OAK-6622
> URL: https://issues.apache.org/jira/browse/OAK-6622
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: lucene
> Reporter: Chetan Mehrotra
> Assignee: Chetan Mehrotra
> Fix For: 1.8
>
>
> {{LuceneIndexProviderService}} currently configures a thread pool like below
> {code}
> ThreadPoolExecutor executor = new ThreadPoolExecutor(
> 0, //corePoolSize
> 5, //maxPoolSize
> 60L,
> TimeUnit.SECONDS,
> new LinkedBlockingQueue<Runnable>(), //Unbounded queue
> new ThreadFactory() {
> {code}
> Per
> [ThreadPoolExecutor|https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadPoolExecutor.html]
>
> {quote}
> If there are more than corePoolSize but less than maximumPoolSize threads
> running, a new thread will be created *only if the queue is full*
> {quote}
> Due to this currently the thread pool created by oak-lucene would only have 1
> thread to handle all task as the queue is unbounded one. And if for some
> reason this thread gets stuck (due to some lock) then it would prevent other
> task in pool from further processing.
>
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