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From Jean-Marc Spaggiari <jean-m...@spaggiari.org>
Subject Re: RPC - Queue Time when handlers are all waiting
Date Mon, 09 Dec 2013 15:53:08 GMT
Yes, default value is 3 in 0.94.14. If you have not changed it, then it's
still 3.

conf.getInt("hbase.regionserver.replication.handler.count", 3);

Keep us posted on the results.

JM


2013/12/9 Federico Gaule <fgaule@despegar.com>

> Default value for hbase.regionserver.replication.handler.count (can't find
> what is the default, Is it 3?)
> I'll do a try increasing that property
>
> Fri Dec 06 12:44:12 EST 2013REPL IPC Server handler 2 on 60020WAITING
> (since 8sec ago)Waiting for a call (since 8sec ago)Fri Dec 06 12:44:12 EST
> 2013REPL IPC Server handler 1 on 60020WAITING (since 8sec ago)Waiting for a
> call (since 8sec ago)Fri Dec 06 12:44:12 EST 2013REPL IPC Server handler 0
> on 60020WAITING (since 2sec ago)Waiting for a call (since 2sec ago)
> Thanks JM
>
>
> 2013/12/9 Jean-Marc Spaggiari <jean-marc@spaggiari.org>
>
> > For replications, the handlers used on the salve cluster are configured
> by
> > hbase.regionserver.replication.handler.count. What value do you have for
> > this property?
> >
> > JM
> >
> >
> > 2013/12/9 Federico Gaule <fgaule@despegar.com>
> >
> > > Here is a thread saying what i think it should be (
> > > http://grokbase.com/t/hbase/user/13bmndq53k/average-rpc-queue-time)
> > >
> > > "The RpcQueueTime metrics are a measurement of how long individual
> calls
> > > stay in this queued state. If your handlers were never 100% occupied,
> > this
> > > value would be 0. An average of 3 hours is concerning, it basically
> means
> > > that when a call comes into the RegionServer it takes on average 3
> hours
> > to
> > > start processing, because handlers are all occupied for that amount of
> > > time."
> > >
> > > Is that correct?
> > >
> > >
> > >
> > > 2013/12/9 Federico Gaule <fgaule@despegar.com>
> > >
> > > > Correct me if i'm wrong, but, Queues should be used only when
> handlers
> > > are
> > > > all busy, shouldn't it?.
> > > > If that's true, i don't get why there is activity related to queues.
> > > >
> > > > Maybe i'm missing some piece of knowledge about when hbase is using
> > > queues
> > > > :)
> > > >
> > > > Thanks
> > > >
> > > >
> > > > 2013/12/9 Jean-Marc Spaggiari <jean-marc@spaggiari.org>
> > > >
> > > >> There might be something I'm missing ;)
> > > >>
> > > >> On cluster B, as you said, never more than 50% of your handlers are
> > > used.
> > > >> Your Ganglia metrics are showing that there is activities (num ops
> is
> > > >> increasing), which is correct.
> > > >>
> > > >> Can you please confirm what you think is wrong from your charts?
> > > >>
> > > >> Thanks,
> > > >>
> > > >> JM
> > > >>
> > > >>
> > > >> 2013/12/9 Federico Gaule <fgaule@despegar.com>
> > > >>
> > > >> > Hi JM,
> > > >> > Cluster B is only receiving replication data (writes), but
> handlers
> > > are
> > > >> > waiting most of the time (never 50% of them are used). As i have
> > read,
> > > >> RPC
> > > >> > queue is only used when handlers are all waiting, does it count
> for
> > > >> > replication as well?
> > > >> >
> > > >> > Thanks!
> > > >> >
> > > >> >
> > > >> > 2013/12/9 Jean-Marc Spaggiari <jean-marc@spaggiari.org>
> > > >> >
> > > >> > > Hi,
> > > >> > >
> > > >> > > When you say that B doesn't get any read/write operation,
does
> it
> > > mean
> > > >> > you
> > > >> > > stopped the replication? Or B is still getting the write
> > operations
> > > >> from
> > > >> > A
> > > >> > > because of the replication? If so, that's why you RPC queue
is
> > > used...
> > > >> > >
> > > >> > > JM
> > > >> > >
> > > >> > >
> > > >> > > 2013/12/9 Federico Gaule <fgaule@despegar.com>
> > > >> > >
> > > >> > > > Not much information in RS logs (DEBUG level set to
> > > >> > > > org.apache.hadoop.hbase). Here is a sample of one regionserver
> > > >> showing
> > > >> > > > increasing rpc.metrics.RpcQueueTime_num_ops and
> > > >> > > > rpc.metrics.RpcQueueTime_avg_time
> > > >> > > > activity:
> > > >> > > >
> > > >> > > > 2013-12-09 08:09:10,699 DEBUG
> > > >> > > > org.apache.hadoop.hbase.io.hfile.LruBlockCache: Stats:
> > total=23.14
> > > >> MB,
> > > >> > > > free=2.73 GB, max=2.75 GB, blocks=0, accesses=122442151,
> > > >> > hits=122168501,
> > > >> > > > hitRatio=99.77%, , cachingAccesses=122192927,
> > > cachingHits=122162378,
> > > >> > > > cachingHitsRatio=99.97%, , evictions=0, evicted=6768,
> > > >> > > > evictedPerRun=Infinity
> > > >> > > > 2013-12-09 08:09:11,396 INFO
> > > >> > > >
> > org.apache.hadoop.hbase.replication.regionserver.ReplicationSink:
> > > >> Total
> > > >> > > > replicated: 1
> > > >> > > > 2013-12-09 08:09:14,979 INFO
> > > >> > > >
> > org.apache.hadoop.hbase.replication.regionserver.ReplicationSink:
> > > >> Total
> > > >> > > > replicated: 2
> > > >> > > > 2013-12-09 08:09:16,016 INFO
> > > >> > > >
> > org.apache.hadoop.hbase.replication.regionserver.ReplicationSink:
> > > >> Total
> > > >> > > > replicated: 1
> > > >> > > > ...
> > > >> > > > 2013-12-09 08:14:07,659 INFO
> > > >> > > >
> > org.apache.hadoop.hbase.replication.regionserver.ReplicationSink:
> > > >> Total
> > > >> > > > replicated: 1
> > > >> > > > 2013-12-09 08:14:08,713 INFO
> > > >> > > >
> > org.apache.hadoop.hbase.replication.regionserver.ReplicationSink:
> > > >> Total
> > > >> > > > replicated: 3
> > > >> > > > 2013-12-09 08:14:10,699 DEBUG
> > > >> > > > org.apache.hadoop.hbase.io.hfile.LruBlockCache: Stats:
> > total=23.14
> > > >> MB,
> > > >> > > > free=2.73 GB, max=2.75 GB, blocks=0, accesses=122442151,
> > > >> > hits=122168501,
> > > >> > > > hitRatio=99.77%, , cachingAccesses=122192927,
> > > cachingHits=122162378,
> > > >> > > > cachingHitsRatio=99.97%, , evictions=0, evicted=6768,
> > > >> > > > evictedPerRun=Infinity
> > > >> > > > 2013-12-09 08:14:12,711 INFO
> > > >> > > >
> > org.apache.hadoop.hbase.replication.regionserver.ReplicationSink:
> > > >> Total
> > > >> > > > replicated: 1
> > > >> > > > 2013-12-09 08:14:14,778 INFO
> > > >> > > >
> > org.apache.hadoop.hbase.replication.regionserver.ReplicationSink:
> > > >> Total
> > > >> > > > replicated: 3
> > > >> > > > ...
> > > >> > > > 2013-12-09 08:15:09,199 INFO
> > > >> > > >
> > org.apache.hadoop.hbase.replication.regionserver.ReplicationSink:
> > > >> Total
> > > >> > > > replicated: 3
> > > >> > > > 2013-12-09 08:15:12,243 INFO
> > > >> > > >
> > org.apache.hadoop.hbase.replication.regionserver.ReplicationSink:
> > > >> Total
> > > >> > > > replicated: 2
> > > >> > > > 2013-12-09 08:15:22,086 INFO
> > > >> > > >
> > org.apache.hadoop.hbase.replication.regionserver.ReplicationSink:
> > > >> Total
> > > >> > > > replicated: 2
> > > >> > > >
> > > >> > > > Thanks
> > > >> > > >
> > > >> > > >
> > > >> > > > 2013/12/7 Bharath Vissapragada <bharathv@cloudera.com>
> > > >> > > >
> > > >> > > > > I'd look into the RS logs to see whats happening
there.
> > > Difficult
> > > >> to
> > > >> > > > guess
> > > >> > > > > from the given information!
> > > >> > > > >
> > > >> > > > >
> > > >> > > > > On Sat, Dec 7, 2013 at 8:52 PM, Federico Gaule
<
> > > >> fgaule@despegar.com>
> > > >> > > > > wrote:
> > > >> > > > >
> > > >> > > > > > Any clue?
> > > >> > > > > > El dic 5, 2013 9:49 a.m., "Federico Gaule"
<
> > > fgaule@despegar.com
> > > >> >
> > > >> > > > > escribió:
> > > >> > > > > >
> > > >> > > > > > > Hi,
> > > >> > > > > > >
> > > >> > > > > > > I have 2 clusters, Master (a) - Slave
(b) replication.
> > > >> > > > > > > B doesn't have client write or reads,
all handlers (100)
> > are
> > > >> > > waiting
> > > >> > > > > but
> > > >> > > > > > > rpc.metrics.RpcQueueTime_num_ops and
> > > >> > > > rpc.metrics.RpcQueueTime_avg_time
> > > >> > > > > > reports
> > > >> > > > > > > to be rpc calls to be queued.
> > > >> > > > > > > There are some screenshots below to
show ganglia
> metrics.
> > > How
> > > >> is
> > > >> > > this
> > > >> > > > > > > behaviour explained? I have looked for
metrics
> > > specifications
> > > >> but
> > > >> > > > can't
> > > >> > > > > > > find much information.
> > > >> > > > > > >
> > > >> > > > > > > Handlers
> > > >> > > > > > > http://i42.tinypic.com/242ssoz.png
> > > >> > > > > > >
> > > >> > > > > > > NumOps
> > > >> > > > > > > http://tinypic.com/r/of2c8k/5
> > > >> > > > > > >
> > > >> > > > > > > AvgTime
> > > >> > > > > > > http://tinypic.com/r/2lsvg5w/5
> > > >> > > > > > >
> > > >> > > > > > > Cheers
> > > >> > > > > > >
> > > >> > > > > >
> > > >> > > > >
> > > >> > > > >
> > > >> > > > >
> > > >> > > > > --
> > > >> > > > > Bharath Vissapragada
> > > >> > > > > <http://www.cloudera.com>
> > > >> > > > >
> > > >> > > >
> > > >> > > >
> > > >> > > >
> > > >> > > > --
> > > >> > > >
> > > >> > > > [image:
> > > >> http://www.despegar.com/galeria/images/promos/isodespegar1.png
> > > >> > ]
> > > >> > > >
> > > >> > > > *Ing. Federico Gaule*
> > > >> > > > Líder Técnico - PAM <hotels-pam-it@despegar.com>
> > > >> > > > Av. Corrientes 746 - Piso 9 - C.A.B.A. (C1043AAU)
> > > >> > > > tel. +54 (11) 4894-3500
> > > >> > > >
> > > >> > > > *[image: Seguinos en Twitter!] <
> > http://twitter.com/#!/despegarar>
> > > >> > > [image:
> > > >> > > > Seguinos en Facebook!] <http://www.facebook.com/despegar>
> > [image:
> > > >> > > Seguinos
> > > >> > > > en YouTube!] <http://www.youtube.com/Despegar>*
> > > >> > > > *Despegar.com, Inc. *
> > > >> > > > El mejor precio para tu viaje.
> > > >> > > >
> > > >> > > > Este mensaje es confidencial y puede contener información
> > > amparada
> > > >> por
> > > >> > > el
> > > >> > > > secreto profesional.
> > > >> > > > Si usted ha recibido este e-mail por error, por favor
> > > >> comuníquenoslo
> > > >> > > > inmediatamente respondiendo a este e-mail y luego
> eliminándolo
> > de
> > > >> su
> > > >> > > > sistema.
> > > >> > > > El contenido de este mensaje no deberá ser copiado
ni
> > divulgado a
> > > >> > > ninguna
> > > >> > > > persona.
> > > >> > > >
> > > >> > >
> > > >> >
> > > >> >
> > > >> >
> > > >> > --
> > > >> >
> > > >> > [image:
> > > http://www.despegar.com/galeria/images/promos/isodespegar1.png]
> > > >> >
> > > >> > *Ing. Federico Gaule*
> > > >> > Líder Técnico - PAM <hotels-pam-it@despegar.com>
> > > >> > Av. Corrientes 746 - Piso 9 - C.A.B.A. (C1043AAU)
> > > >> > tel. +54 (11) 4894-3500
> > > >> >
> > > >> > *[image: Seguinos en Twitter!] <http://twitter.com/#!/despegarar>
> > > >> [image:
> > > >> > Seguinos en Facebook!] <http://www.facebook.com/despegar>
[image:
> > > >> Seguinos
> > > >> > en YouTube!] <http://www.youtube.com/Despegar>*
> > > >> > *Despegar.com, Inc. *
> > > >> > El mejor precio para tu viaje.
> > > >> >
> > > >> > Este mensaje es confidencial y puede contener información
> amparada
> > > por
> > > >> el
> > > >> > secreto profesional.
> > > >> > Si usted ha recibido este e-mail por error, por favor
> > comuníquenoslo
> > > >> > inmediatamente respondiendo a este e-mail y luego eliminándolo
de
> > su
> > > >> > sistema.
> > > >> > El contenido de este mensaje no deberá ser copiado ni divulgado
a
> > > >> ninguna
> > > >> > persona.
> > > >> >
> > > >>
> > > >
> > > >
> > > >
> > > > --
> > > >
> > > > [image:
> http://www.despegar.com/galeria/images/promos/isodespegar1.png
> > ]
> > > >
> > > > *Ing. Federico Gaule*
> > > > Líder Técnico - PAM <hotels-pam-it@despegar.com>
> > > >
> > > > Av. Corrientes 746 - Piso 9 - C.A.B.A. (C1043AAU)
> > > > tel. +54 (11) 4894-3500
> > > >
> > > >
> > > > *[image: Seguinos en Twitter!] <http://twitter.com/#!/despegarar>
> > > [image:
> > > > Seguinos en Facebook!] <http://www.facebook.com/despegar> [image:
> > > Seguinos
> > > > en YouTube!] <http://www.youtube.com/Despegar>*
> > > > *Despegar.com, Inc. *
> > > >
> > > > El mejor precio para tu viaje.
> > > >
> > > > Este mensaje es confidencial y puede contener información amparada
> por
> > > el
> > > > secreto profesional.
> > > > Si usted ha recibido este e-mail por error, por favor comuníquenoslo
> > > > inmediatamente respondiendo a este e-mail y luego eliminándolo de su
> > > > sistema.
> > > > El contenido de este mensaje no deberá ser copiado ni divulgado a
> > > ninguna
> > > > persona.
> > > >
> > >
> > >
> > >
> > > --
> > >
> > > [image: http://www.despegar.com/galeria/images/promos/isodespegar1.png
> ]
> > >
> > > *Ing. Federico Gaule*
> > > Líder Técnico - PAM <hotels-pam-it@despegar.com>
> > > Av. Corrientes 746 - Piso 9 - C.A.B.A. (C1043AAU)
> > > tel. +54 (11) 4894-3500
> > >
> > > *[image: Seguinos en Twitter!] <http://twitter.com/#!/despegarar>
> > [image:
> > > Seguinos en Facebook!] <http://www.facebook.com/despegar> [image:
> > Seguinos
> > > en YouTube!] <http://www.youtube.com/Despegar>*
> > > *Despegar.com, Inc. *
> > > El mejor precio para tu viaje.
> > >
> > > Este mensaje es confidencial y puede contener información amparada por
> > el
> > > secreto profesional.
> > > Si usted ha recibido este e-mail por error, por favor comuníquenoslo
> > > inmediatamente respondiendo a este e-mail y luego eliminándolo de su
> > > sistema.
> > > El contenido de este mensaje no deberá ser copiado ni divulgado a
> > ninguna
> > > persona.
> > >
> >
>
>
>
> --
>
> [image: http://www.despegar.com/galeria/images/promos/isodespegar1.png]
>
> *Ing. Federico Gaule*
> Líder Técnico - PAM <hotels-pam-it@despegar.com>
> Av. Corrientes 746 - Piso 9 - C.A.B.A. (C1043AAU)
> tel. +54 (11) 4894-3500
>
> *[image: Seguinos en Twitter!] <http://twitter.com/#!/despegarar> [image:
> Seguinos en Facebook!] <http://www.facebook.com/despegar> [image: Seguinos
> en YouTube!] <http://www.youtube.com/Despegar>*
> *Despegar.com, Inc. *
> El mejor precio para tu viaje.
>
> Este mensaje es confidencial y puede contener información amparada por el
> secreto profesional.
> Si usted ha recibido este e-mail por error, por favor comuníquenoslo
> inmediatamente respondiendo a este e-mail y luego eliminándolo de su
> sistema.
> El contenido de este mensaje no deberá ser copiado ni divulgado a ninguna
> persona.
>

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