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HBase, mail # dev - Metrics in 0.96


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Re: Metrics in 0.96
Andrew Wang 2012-06-30, 00:41
I think Elliot's concern with the histogram improvements is that if it goes
in hadoop-common, HBase is only going to get it after it gets rolled into a
new hadoop-common release and HBase bumps the version on the hadoop-common
dependency. I don't think this is so bad.

For now though, I'm willing to maintain an HBase patchset against this
future improved hadoop-common until it's actually released.

Thanks,
Andrew

On Fri, Jun 29, 2012 at 5:31 PM, Andrew Purtell <[EMAIL PROTECTED]>wrote:

> Metrics2 is in both Hadoop 1 and 2. (?)
>
> But my thing was the latter point below anyhow.
>
> On Jun 29, 2012, at 1:53 PM, Elliott Clark <[EMAIL PROTECTED]> wrote:
>
> > I'm excited about the new accurate histogram, however I don't think that
> > we'll get it when we move to metrics2.  Any direct usage would break
> > backward compat for all older hadoop installs.
> > For backwards compatibility on hadoop versions we will either have to
> > create a shim layer with reflection, or pull the code in.  Since we
> already
> > have a MeticsHistogram I think pulling the code into hbase may be the
> right
> > choice.
> >
> > On Fri, Jun 29, 2012 at 1:15 PM, Andrew Purtell <[EMAIL PROTECTED]>
> wrote:
> >
> >> On Fri, Jun 29, 2012 at 1:10 PM, Alex Baranau <[EMAIL PROTECTED]
> >
> >> wrote:
> >>> Meanwhile I suggested taking on this one:
> >>> https://issues.apache.org/jira/browse/HBASE-4050 separately/first.
> What
> >> do
> >>> you think?
> >>
> >> +1
> >>
> >> In related discussion, it looks to me like Stack thinks pulling in the
> >> histogram accuracy improvement work via metrics2 is a good idea.
> >>
> >> Independent of this something I would like to be able to do is log
> >> metrics to a file as well as Ganglia concurrently, and metrics2 can do
> >> that.
> >>
> >>
> >> Best regards,
> >>
> >>   - Andy
> >>
> >> Problems worthy of attack prove their worth by hitting back. - Piet
> >> Hein (via Tom White)
> >>
>