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From Gary Helmling <ghelml...@gmail.com>
Subject Re: Paths of evolution for Hadoop metrics
Date Fri, 17 Sep 2010 22:37:22 GMT
>From the HBase perspective, life is complicated by the need to support
running on multiple Hadoop versions.  Current HBase trunk is really targeted
at 0.20-append, but I'm also working to add 0.20-security (or
0.20-append-security) to that.  And there have been questions (though I'm
not sure a clear decision) on support for 0.21 now that it's released.  And
obviously I can't predict where things will stand in the 0.22 timeframe.

Sounds like the new framework will have some great stuff allowing us to
strip out some of the HBase code we've added for metrics (built-on JMX
support), which would be great to make use of.  But until HBase is targeting
only 0.22+ I don't think we'll fully be able to convert to it.

So I'd vote for option #2 to allow us to make a phased transition.

--gh

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