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From "Josh Elser" <josh.el...@gmail.com>
Subject Review Request 15752: ACCUMULO-1854 Persist AccumuloInputFormat information from Configuration into RangeInputSplit
Date Thu, 21 Nov 2013 05:31:45 GMT

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/15752/
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Review request for accumulo.


Bugs: ACCUMULO-1854
    https://issues.apache.org/jira/browse/ACCUMULO-1854


Repository: accumulo


Description
-------

The current way that AccumuloInputFormat works requires that the same *exact* Configuration
that was used to invoke getSplits() is also provided when createRecordReader() is called on
the InputFormat. In practice, notably looking at InputFormat implementations which merge or
delegate other InputFormats, this is a bad idea.

By serializing the necessary information into the RangeInputSplit from the provided Configuration
object in getSplits() we can completely avoid this problem, at the minimal expense of serialization
this information into each InputSplit. I tried to implement the changes in such a way that
would be backwards compatible. If the information is not provided (is null) in the RangeInputSplit,
the RecordReader will still attempt to pull a value from the Configuration object so as to
not fail immediately. This should provide a little more flexibility if users have custom code
built on top of the AccumuloInputFormat and RangeInputSplit


Diffs
-----

  src/core/src/main/java/org/apache/accumulo/core/client/mapreduce/AccumuloInputFormat.java
4de131f 
  src/core/src/main/java/org/apache/accumulo/core/client/mapreduce/InputFormatBase.java 8e238f1

  src/core/src/main/java/org/apache/accumulo/core/client/mapreduce/RangeInputSplit.java PRE-CREATION

  src/core/src/test/java/org/apache/accumulo/core/client/mapreduce/AccumuloInputFormatTest.java
ba647e9 
  src/core/src/test/java/org/apache/accumulo/core/client/mapreduce/AccumuloRowInputFormatTest.java
0673f1b 
  src/core/src/test/java/org/apache/accumulo/core/client/mapreduce/RangeInputSplitTest.java
PRE-CREATION 
  src/examples/simple/src/test/java/org/apache/accumulo/examples/simple/filedata/ChunkInputFormatTest.java
c31c738 

Diff: https://reviews.apache.org/r/15752/diff/


Testing
-------

Verified changes work as intended using PigInputFormat (which may delegate to many InputFormats).
Added additional unit tests and verified sufficient coverage using cobertura.


Thanks,

Josh Elser


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