Github user dragos commented on the pull request:
https://github.com/apache/spark/pull/5563#issuecomment-116740081
This doesn't work with scalar attributes. For example:
```
mesos-slave --master=aquarius:5050 --attributes="zone:main;color:3"
```
and then
```
spark.mesos.constraints color:3
```
will never accept any resources.
I think this needs to support such attributes. It also needs to log
whenever a resource is declined because of attributes not matching, ideally
showing the mismatch.
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