[jira] [Created] (ACCUMULO-2300) Leaking internal state in core/client code

["Josh Elser (JIRA)" <ji...@apache.org>]

Josh Elser created ACCUMULO-2300:
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             Summary: Leaking internal state in core/client code
                 Key: ACCUMULO-2300
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2300
             Project: Accumulo
          Issue Type: Improvement
          Components: client
    Affects Versions: 1.5.0
            Reporter: Josh Elser
            Priority: Minor


In perusing over the findbugs reports, I noticed that there was a fair amount of classes in the core module that were subject to leaking internal state (most commonly, returning the actual array it holds internally instead of a copy or a wrapper).

ArrayByteSequence, Column, ColumnUpdate, ComparableBytes, KeyValue, Mutation, Value, ColumnVisibility are the classes that caught my eye.

I would imagine that this is something we ultimately want to fix, but I'm not sure of what the timeline should be. A decent short-term would be to just return copies of those {{byte[]}} instead of the internal member. A longer-term solution might be to rework some of those classes to use an object instead (e.g. ByteBuffer) that might have constructs to provide r/o views instead of having to make a defensive copy.



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