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 <jinalshah2...@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 <yuzhih...@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 <jinalshah2...@gmail.com> > > wrote: > > > > > We are using 0.94.15 version. > > > > > > On Wed, Oct 1, 2014 at 10:03 AM, Ted Yu <yuzhih...@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 <jinalshah2...@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 > > > > > > > > > > > > > > >
