Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/3938#issuecomment-69105025
@vanzin Hm, maybe that's what I'm seeing. If I `mvn -Pyarn
-Dhadoop.version=2.4.0 -Dverbose dependency:tree` I see
```
[INFO] | +- org.apache.hadoop:hadoop-hdfs:jar:2.4.0:compile
...
[INFO] | | +- (org.codehaus.jackson:jackson-core-asl:jar:1.8.8:compile -
version managed from 1.9.13; omitted for duplicate)
[INFO] | | +- (org.codehaus.jackson:jackson-mapper-asl:jar:1.8.8:compile
- version managed from 1.9.13; omitted for duplicate)
```
But yeah if I remove the overrides, it looks like Hadoop uses 1.8.8.
So we could...
- Just also manage Hadoop 2.6 down to 1.8.8 (and just manage the new
artifact versions). No new profile.
- Manage everything up to Jackson 1.9.13. I don't know 100% this works but
would have thought it's safer than managing down. That said it was managed down
for a reason I presume
- Make the new profile and take the hit on yet more profile complexity
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