Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/3103#issuecomment-61943323
SBT produce the MF as follows, it discards other third party MANIFEST.MF
but fill in spark's:
```
Manifest-Version: 1.0
Implementation-Vendor: org.apache.spark
Implementation-Title: spark-assembly
Implementation-Version: 1.2.0-SNAPSHOT
Implementation-Vendor-Id: org.apache.spark
Specification-Vendor: org.apache.spark
Specification-Title: spark-assembly
Specification-Version: 1.2.0-SNAPSHOT
```
And no MANIFEST.MF is ok if #3124 and #3105 merged.
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