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HBase cluster on heterogeneous filesystems

I was wondering if anyone has done an experiment with HBase or HDFS/MR where machines in the cluster have heterogeneous underlying file systems?
* 10 nodes with xfs
* 10 nodes with ext3
* 10 nodes with ext4

The goal being comparing performance of MapReduce jobs reading from and writing to HBase (or just HDFS).
And does anyone have any reason to believe doing the above would be super risky and cause data loss?

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