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 <[email protected]> > 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 <[email protected]> > > > 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 <[email protected]> > > > > > 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 <[email protected]> > > > > > > > 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 <[email protected]> > > > > > > > > > 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 < > [email protected]> > > > > > wrote: > > > > > > > > > > > Any clue? > > > > > > El dic 5, 2013 9:49 a.m., "Federico Gaule" <[email protected]> > > > > > 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 <[email protected]> > > > > 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 comunÃquenoslo > > > > 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 <[email protected]> > > 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 comunÃquenoslo > > 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 <[email protected]> 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 comunÃquenoslo 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.
