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https://issues.apache.org/jira/browse/MAPREDUCE-716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12734249#action_12734249
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Tsz Wo (Nicholas), SZE commented on MAPREDUCE-716:
--------------------------------------------------
Since test-patch is broken (see HADOOP-6124), the patch committed introduced
some javac warnings without being detected.
{noformat}
[javac]
d:\...@sze\hadoop\mapreduce\m1\src\java\org\apache\hadoop\mapreduce\lib\db\dbinputformat.java:184:
warning: [unchecked] unchecked conversion
[javac] found : java.lang.Class
[javac] required: java.lang.Class<T>
[javac] return new OracleDBRecordReader<T>(split, inputClass,
[javac] ^
[javac]
d:\...@sze\hadoop\mapreduce\m1\src\java\org\apache\hadoop\mapreduce\lib\db\dbinputformat.java:188:
warning: [unchecked] unchecked conversion
[javac] found : java.lang.Class
[javac] required: java.lang.Class<T>
[javac] return new MySQLDBRecordReader<T>(split, inputClass,
[javac] ^
[javac]
d:\...@sze\hadoop\mapreduce\m1\src\java\org\apache\hadoop\mapreduce\lib\db\dbinputformat.java:192:
warning: [unchecked] unchecked conversion
[javac] found : java.lang.Class
[javac] required: java.lang.Class<T>
[javac] return new DBRecordReader<T>(split, inputClass,
[javac] ^
{noformat}
> org.apache.hadoop.mapred.lib.db.DBInputformat not working with oracle
> ---------------------------------------------------------------------
>
> Key: MAPREDUCE-716
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-716
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Environment: Java 1.6, HAdoop0.19.0, Linux..Oracle,
> Reporter: evanand
> Assignee: Aaron Kimball
> Fix For: 0.21.0
>
> Attachments: HADOOP-5482.20-branch.patch, HADOOP-5482.patch,
> HADOOP-5482.trunk.patch, MAPREDUCE-716.2.branch20.patch,
> MAPREDUCE-716.2.trunk.patch, MAPREDUCE-716.3.trunk.patch,
> MAPREDUCE-716.4.branch20.patch, MAPREDUCE-716.4.trunk.patch
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> org.apache.hadoop.mapred.lib.db.DBInputformat not working with oracle.
> The out of the box implementation of the Hadoop is working properly with
> mysql/hsqldb, but NOT with oracle.
> Reason is DBInputformat is implemented with mysql/hsqldb specific query
> constructs like "LIMIT", "OFFSET".
> FIX:
> building a database provider specific logic based on the database
> providername (which we can get using connection).
> I HAVE ALREADY IMPLEMENTED IT FOR ORACLE...READY TO CHECK_IN CODE
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