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From keith-turner <...@git.apache.org>
Subject [GitHub] incubator-fluo issue #805: Consider caching columns while scanning
Date Thu, 17 Nov 2016 19:29:47 GMT
GitHub user keith-turner opened an issue:

    https://github.com/apache/incubator-fluo/issues/805

    Consider caching columns while scanning

    In #804 I made some conservative changes to reuse columns objects.  These changes only
did this when the user passed in a set of wanted columns.  In this case it was wasy because
we knew what columns to expect.  For the case where a user scans over a row range and does
not provide a set of columns, nothing was done in #804.  In this case a cache of columns could
improve performance in some cases.  The cache would need to be smart and not hinder performance
in the case where the cache hit rate is low.  In the case maybe the cache could just stop
looking in the cache and always create new Column objects.  
    
    Could also look at caching on the family and qualifier level instead of in addition to
the column level.
    


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