Stamatis Zampetakis created MAPREDUCE-7368:
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Summary: DBOutputFormat.DBRecordWriter#write must throw exception
when it fails
Key: MAPREDUCE-7368
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7368
Project: Hadoop Map/Reduce
Issue Type: Bug
Affects Versions: 3.3.1
Reporter: Stamatis Zampetakis
When the
[DBRecordWriter#write|https://github.com/apache/hadoop/blob/91af256a5b44925e5dfdf333293251a19685ba2a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.java#L120]
fails with an {{SQLException}} the problem is not propagated but printed in
{{System.err}} instead.
{code:java}
public void write(K key, V value) throws IOException {
try {
key.write(statement);
statement.addBatch();
} catch (SQLException e) {
e.printStackTrace();
}
}
{code}
The consumer of this API has no way to tell that the write failed. Moreover,
the exception is not present in the logs which makes the problem very hard
debug and can easily lead to data corruption since clients can easily assume
that everything went well.
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