Mailing-List: contact dev-help@hbase.apache.org; run by ezmlm
Precedence: bulk
Reply-To: dev@hbase.apache.org
Received-SPF: pass (athena.apache.org: domain of yuzhihong@gmail.com
 designates 209.85.216.182 as permitted sender)
MIME-Version: 1.0
In-Reply-To: 
 <CAAZ8DxryETtAF-i_8FaEicdNPB-5Yv-BpOPkKcE12=OzioA7OA@mail.gmail.com>
References: 
 <CAAZ8Dxp-2-n_RQAFukjJY+rCs+MFxz_4XKef+FxHuhm1B2qOrg@mail.gmail.com>
	<CALte62y-x4qptdCMSGSFONoVGVBwuPqozyFE=qmXaR2P6HGP4A@mail.gmail.com>
	<CAAZ8Dxr0HcTd+W7bU7WU1-SAv8GOtoJEzdCx2NDTLhDmmuBhoA@mail.gmail.com>
	<CALte62ws32M8huEk=KZGtGN6G8pfqvKvqJ=nTS86EFKptyBJ-Q@mail.gmail.com>
	<CAAZ8DxryETtAF-i_8FaEicdNPB-5Yv-BpOPkKcE12=OzioA7OA@mail.gmail.com>
Date: Wed, 1 Oct 2014 10:51:09 -0700
Message-ID: 
 <CALte62x2if27+KR3CBy=EjR5baP+cCgZ7QwE2Ub0rVsyL-KvkA@mail.gmail.com>
Subject: Re: WARN messages clarifications
From: Ted Yu <yuzhihong@gmail.com>
To: "dev@hbase.apache.org" <dev@hbase.apache.org>
Content-Type: multipart/alternative; boundary=089e0103e7301d3bb2050460258d

--089e0103e7301d3bb2050460258d
Content-Type: text/plain; charset=UTF-8

Suppose your OutlierHTable was communicating with a region server which
happened to go through GC pause.
The query would exhibit longer duration compared to one where no region
server goes through GC (assuming other factors being equal: network
traffic, size of data queried, etc).

bq. Is GC pause set on a timer?

I don't think so. It depends on the load region server handles.

Cheers

On Wed, Oct 1, 2014 at 10:37 AM, Jinal Shah <jinalshah2007@gmail.com> wrote:

> Is GC pause set on a timer? How much does that impact the query request?
>
> On Wed, Oct 1, 2014 at 10:48 AM, Ted Yu <yuzhihong@gmail.com> wrote:
>
> > One other possibility would be the region server going through GC pause.
> >
> > Cheers
> >
> > On Wed, Oct 1, 2014 at 8:04 AM, Jinal Shah <jinalshah2007@gmail.com>
> > wrote:
> >
> > > We are using 0.94.15 version.
> > >
> > > On Wed, Oct 1, 2014 at 10:03 AM, Ted Yu <yuzhihong@gmail.com> wrote:
> > >
> > > > I searched 0.94 and 0.98 code base but didn't find the message below.
> > > >
> > > > Which version of HBase are you using ?
> > > >
> > > > Cheers
> > > >
> > > > On Wed, Oct 1, 2014 at 7:58 AM, Jinal Shah <jinalshah2007@gmail.com>
> > > > wrote:
> > > >
> > > > > Hi everyone
> > > > >
> > > > > We are seeing these WARN log messages from this class
> > > > >
> > > >
> > >
> >
> com.cerner.hbase.extensions.OutlierHTableInterceptorFactory$OutlierHTable.
> > > > > It normally happens when the query takes a long time to execute and
> > > > > displays the duration as well like this
> > > > >
> > > > > Duration Threshold exceeded: [durationThreshold=1000]
> > > > > Actuals: [actualBatchSize=1: actualPayloadSize=0:
> > actualDuration=3929]
> > > > >
> > > > > The scenarios I found for the delay are
> > > > >
> > > > >
> > > > >    - Network issues taking time for delays
> > > > >    - Trying to establish a connection for the first time
> > > > >    - Some component failures occurred like Zookeeper node when down
> > or
> > > > >    Master failed over.
> > > > >
> > > > >
> > > > > So can someone give say what other possible scenarios for delays in
> > > > > executing a query.
> > > > >
> > > > > Thanks
> > > > > Jinal
> > > > >
> > > >
> > >
> >
>

--089e0103e7301d3bb2050460258d--