Recommended file-system for DataNode

[Stas Oskin-2]

Hi.

I'm using the stock Ext3 as the most tested one, but I wonder, has someone
ever tried, or even using there days in production another file system, like
JFS, XFS or even maybe Ext4?

I'm exploring way to boost the performance of DataNodes, and this seems as
one of possible venues.

Thanks for any info!