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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-740) Infinite loop in RFile code
Date Thu, 23 Aug 2012 16:24:42 GMT
Keith Turner created ACCUMULO-740:
-------------------------------------

             Summary: Infinite loop in RFile code
                 Key: ACCUMULO-740
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-740
             Project: Accumulo
          Issue Type: Bug
            Reporter: Keith Turner
             Fix For: 1.5.0


Saw an infinite loop in RFile code when new on demand indexing was turned on and table contained
zero length values.  I think this is only an issue in trunk, but need to analyze 1.4 code
to make sure it does not happen. 

The problematic code is 

{noformat}
org.apache.accumulo.core.file.rfile.RelativeKey.read(DataInput in, MByteSequence mbseq, int
len){...}
{noformat}

When the input mbseq is backed by a zero length array, an infinite loop will occur.  Also
noticed that the code could overflow the integer and cause an inifinite loop (a key or value
> 2^30 would be needed to trigger this).  I suspect 1.4 will never generate an input that
will cause the infinite loop, but I am not 100% sure about this.  



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