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From "Marshall Schor (JIRA)" <...@uima.apache.org>
Subject [jira] [Resolved] (UIMA-2434) Feature structure removal from sorted index is very slow
Date Mon, 17 Jun 2013 15:50:20 GMT

     [ https://issues.apache.org/jira/browse/UIMA-2434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Marshall Schor resolved UIMA-2434.
----------------------------------

    Resolution: Fixed
    
> Feature structure removal from sorted index is very slow
> --------------------------------------------------------
>
>                 Key: UIMA-2434
>                 URL: https://issues.apache.org/jira/browse/UIMA-2434
>             Project: UIMA
>          Issue Type: Improvement
>          Components: Core Java Framework
>    Affects Versions: 2.3.1SDK
>            Reporter: Mikhail Sogrin
>            Assignee: Marshall Schor
>             Fix For: 2.4.1SDK
>
>
> Removal of feature structures from sorted indexes (e.g. default index) is very slow.
FSIntArrayIndex.remove() method performs two operations: linear search in the array until
the given FS is found, followed by the shift of elements to the end of this array by one position
to the left.
> If many annotations (millions and more) are being deleted at once, this operation gets
very very slow - much slower than adding these annotations in the first place. It seems to
require O(N^2) time to remove N annotations.
> One item is the linear search, which can be replaced by the binary search method, which
is already implemented in the same class.
> Second, array copy can be done with Java built-in method instead of a custom loop.
> Ideally, a method for bulk removal of a collection of annotations would have been the
most efficient, for example a method to remove all annotations of a given type.

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