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From "Chetan Mehrotra (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-6622) Configure default core pool size for thread pool used by oak-lucene
Date Wed, 06 Sep 2017 10:24:00 GMT
Chetan Mehrotra created OAK-6622:
------------------------------------

             Summary: 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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