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Date: Fri, 23 Dec 2011 16:00:30 +0000 (UTC)
From: "Keith Turner (Updated) (JIRA)" <jira@apache.org>
To: accumulo-dev@incubator.apache.org
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Subject: [jira] [Updated] (ACCUMULO-226) BatchScanner iterator
 implementation erroneously returns true for hasNext upon subsequent hasNext
 calls
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     [ https://issues.apache.org/jira/browse/ACCUMULO-226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Keith Turner updated ACCUMULO-226:
----------------------------------

    Resolution: Fixed
        Status: Resolved  (was: Patch Available)
    
> BatchScanner iterator implementation erroneously returns true for hasNext upon subsequent hasNext calls
> -------------------------------------------------------------------------------------------------------
>
>                 Key: ACCUMULO-226
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-226
>             Project: Accumulo
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 1.3.5
>         Environment: Platform independent 
>            Reporter: Matthew Kirkley
>            Assignee: Keith Turner
>              Labels: accumulo, batchscanner
>             Fix For: 1.4.0, 1.5.0
>
>         Attachments: accumulo_TabletServerBatchReaderIterator.patch
>
>
> If you open a batch scanner and iterate through its contents, after hasNext has returned false, subsequent calls to hasNext will return true. Below is a testcase which shows the issue.
>         Connector conn = new Connector(new ZooKeeperInstance("accumulo","localhost"),"root","password".getBytes());
>         BatchScanner scanner = conn.createBatchScanner("test", Constants.NO_AUTHS, 1);
>         scanner.setRanges(Collections.singletonList(new Range()));
>         
>         //exhaust the iterator
>         Iterator it = scanner.iterator();
>         while (it.hasNext()){
>             it.next();
>         }
>         assertFalse("hasNext should be false", it.hasNext());
> I found this issue when wrapping a BatchScanner in a IteratorChain which subsequently seems to call hasNext twice in it's hasNext method.  I will attach a patch which resolves the issue.

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