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From: Elliott Clark <eclark@apache.org>
Date: Mon, 20 Jun 2016 10:13:14 -0700
Message-ID: <CALvzVW3Rw2Sit6sOkh9KTB4OG2f=MVPbuoMPvgFHPnkhG2wCpQ@mail.gmail.com>
Subject: Re: MutableQuantiles
To: "dev@hbase.apache.org" <dev@hbase.apache.org>
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archived-at: Mon, 20 Jun 2016 17:13:18 -0000

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MetricMutableHistogram and all ( The classes which were ports of hadoop's
classes) have been removed. They are no longer used.  However the ones
hadoop supplies were very slow so instead we use MutableHistogram.

See:  HBASE-15222

On Mon, Jun 20, 2016 at 5:19 AM, Lars George <lars.george@gmail.com> wrote:

> BTW, I am looking at 1.2 branch, though here the Hadoop one does
> exactly the same as what the HBase one does. Where do I see the
> difference? Master looks the same too. Are you referring to the
> histogram classes?
>
> On Mon, Jun 20, 2016 at 1:36 PM, Lars George <lars.george@gmail.com>
> wrote:
> > Ah thanks Andy. It seemed mostly a copy (with some internal
> > modification). Now, where is that used at all?
> >
> > On Sun, Jun 19, 2016 at 7:06 PM, Andrew Purtell
> > <andrew.purtell@gmail.com> wrote:
> >> We have additional functionality that the Hadoop supplied one does not,
> importantly the ability to dump counts by latency bucket rather than
> percentile measures at the moment. The former can be used to calculate
> mathematically meaningful percentile measures over the whole fleet and over
> longer timescales, the latter cannot.
> >>
> >>
> >>> On Jun 19, 2016, at 9:36 AM, Lars George <lars.george@gmail.com>
> wrote:
> >>>
> >>> Hi,
> >>>
> >>> As per https://issues.apache.org/jira/browse/HBASE-6409 we rolled our
> >>> own class. Is that still needed? Since 2012 lot's has changed and we
> >>> should have all in place to use the Hadoop supplied one?
> >>>
> >>> Just curious.
> >>>
> >>> Cheers,
> >>> Lars
>

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