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From "Aaron McCurry (JIRA)" <j...@apache.org>
Subject [jira] [Created] (BLUR-142) Create IndexReader that can be exited at any time via AtomicBoolean
Date Wed, 19 Jun 2013 01:18:19 GMT
Aaron McCurry created BLUR-142:
----------------------------------

             Summary: Create IndexReader that can be exited at any time via AtomicBoolean
                 Key: BLUR-142
                 URL: https://issues.apache.org/jira/browse/BLUR-142
             Project: Apache Blur
          Issue Type: Bug
          Components: Blur
    Affects Versions: 0.2.0
            Reporter: Aaron McCurry
             Fix For: 0.2.0


This has to do with query cancelation and I thought that the way Lucene 4 implemented query
rewrites this would not be needed anymore.  However I was wrong.  During leading wildcard
queries the all the terms of a field have to be traversed and if the field is very large this
can cause a lot of processing to occur.  During this term iteration if the query is canceled
or it timeouts the thread has no way of exiting the iteration loop.

The ExitableReader provides a lightweight wrapper around a standard DirectoryReader and will
throw an exception once the internal AtomicBoolean is set to false.

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