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From Federico Gaule <fga...@despegar.com>
Subject Re: RPC - Queue Time when handlers are all waiting
Date Mon, 09 Dec 2013 14:13:39 GMT
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:
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>



-- 

[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
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