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From "John Vines (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-664) Mock does not properly emulate object reuse
Date Fri, 29 Jun 2012 17:58:43 GMT
John Vines created ACCUMULO-664:
-----------------------------------

             Summary: Mock does not properly emulate object reuse
                 Key: ACCUMULO-664
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-664
             Project: Accumulo
          Issue Type: Improvement
          Components: test
    Affects Versions: 1.4.1, 1.3.6
            Reporter: John Vines
            Assignee: John Vines
             Fix For: 1.5.0, 1.4.2


Currently our MockAccumulo uses a Key,Value Map to emulate the back end. And next() calls
just get the Key and Value from the map, with no object reuse. This can cause users to create
iterators which use an object that succeed in Mock but fail on the real system. We should
have some sort of system to better emulate the appropriate behavior.

I talked to Adam offline about this, and there were a few initial ideas, which basically involve
reusing an object and reading in the Value from the Map. However, we think it would be a better
idea to create a special Key and Value extension which Mock uses. This special class would
have a flag that gets set by the internal Mock next() method to 'invalidate' the old Key and
Value, so if there are any indications of reuse, they throw an exception with a description
of their misuse.

There still may be an issue with that implementation if users are messing with internal byte
arrays, so we may need to make an additional step to either overwrite that data with an informative
message and/or have some sort of output when people get the byte array to warn them.

Additionally, Key use may not be an actual issue, since I think only RelativeKeys are reused
under the hood. However, this may not be the case for using MapFiles. Keith can probably quickly
answer this question.

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