[linuxhansl]

Thanks. If there's a more detailed writeup you can point me to that'd be great. I would like to make sure then that all these issues are addressed in the current versions.

0.94+ has MSLAB by default, with HFileV2 (0.92+) we can support much larger regions (20G or bigger). Curious about the 512M HBlocks, did you have scan-heavy read-load?

14k TX peak per regionserver? x 2k that's 28M/s (56M with WAL). Should be doable now even with WAL (definitely with deferred flush). Well, maybe not with concurrent very heavy read load, depending on disk configuration.

Probably on top of Hadoop 0.20-append? Hadoop-2.x.x should be far better too.