Silicon Valley startup MapR has unveiled what it calls the "next generation" of Hadoop, revealing that this revamp of the open source distributed number-crunching platform drives the Hadoop appliance recently announced by EMC. According to MapR CEO and cofounder John Schroeder, the company has rebuilt Hadoop's storage system, …
Is this a Hadoop distribution?
Not wishing to be negative here, but if they've replaced the filesystem and the MR engine, is this "a hadoop distribution", or is it "a replacement for hadoop that isn't tested at the same scale". It's fine if they come out and admit this, but it's such a major rework that it is completely different.
Multiple writers? Over NFS? Gulp.
If my EMC rep tells me that they're selling a cloud-scale system and relying on NFS to keep multiple writers in sync, I'm running for the hills.
NFS locking = evil. Anyone who's spent days wrestling with lockd and statd knows what I mean.
Hopefully this is all a bad dream and there is no locking required because no two writers ever update the same data shard. As soon as locking gets involved, you are doomed.
Maybe this is announcement is what all that end of the world stuff was about.
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