Hi Ted， KeyOnlyFilter may improve the scan speed but I don't think the scan may finish less than leaseTimeout in such case； >From the HRegionServer#get I see：
HRegion region = getRegion(regionName); here getRegion may throw NotServingRegionException that is need by isSuccessfulScan; and HRegionServer#get can return as soon as possible; 2015-01-07 11:00 GMT+08:00 Ted Yu <[email protected]>: > For isSuccessfulScan(), I see: > > scan.setBatch(1) > scan.setCaching(1) > scan.setFilter(FirstKeyOnlyFilter.new()) > > How about adding a KeyOnlyFilter as well ? > > On Tue, Jan 6, 2015 at 6:37 PM, Bi,hongyu—mike <[email protected]> wrote: > > > Thanks Ted， > > Finally I resolved the issue, the RC is :region_mover will call > > isSuccessfulScan to scan the startkey of the moved region which filled > with > > lots of expired cells，so it seems scan hang； > > I think isSuccessfulScan is just to test whether the moved region is > > readable or not, why not to use get instead which may avoid such case > > > > > > > > 2015-01-06 20:59 GMT+08:00 Ted Yu <[email protected]>: > > > > > Can you pastebin region server log ? > > > > > > When the scan is being performed, can you get jstack and pastebin it ? > > > > > > 0.94.15 was an old release, any chance of upgrade ? > > > > > > Thanks > > > > > > > > > > > > > On Jan 6, 2015, at 2:34 AM, Bi,hongyu—mike <[email protected]> > wrote: > > > > > > > > sorry , forgot to attach the version： 0.94.15； > > > > > > > > and i call compact (as well as many times flush region) from hbase > > shell > > > > didn't take effect, no compaction happened; > > > > > > > > 2015-01-06 18:26 GMT+08:00 Bi,hongyu—mike <[email protected]>: > > > > > > > >> scan debug log： > > > >> 15/01/06 18:20:56 DEBUG client.ClientScanner: Creating scanner over > T > > > >> starting at key 'Rowx' > > > >> 15/01/06 18:20:56 DEBUG client.ClientScanner: Advancing internal > > scanner > > > >> to startKey at 'Rowx' > > > >> 15/01/06 18:20:56 DEBUG client.MetaScanner: Scanning .META. starting > > at > > > >> row=XXXX for max=10 rows using > > > >> > > > > > > org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@427b7b5d > > > >> 15/01/06 18:20:56 DEBUG > > > >> client.HConnectionManager$HConnectionImplementation: Cached location > > for > > > >> <THAT REGION> is RS_IP:60020 > > > >> ...... > > > >> 15/01/06 18:21:16 DEBUG zookeeper.ClientCnxn: Got ping response for > > > >> sessionid: 0x3499df682b076cf after 0ms > > > >> 15/01/06 18:21:36 DEBUG zookeeper.ClientCnxn: Got ping response for > > > >> sessionid: 0x3499df682b076cf after 0ms > > > >> 15/01/06 18:21:56 DEBUG zookeeper.ClientCnxn: Got ping response for > > > >> sessionid: 0x3499df682b076cf after 0ms > > > >> 15/01/06 18:21:56 DEBUG zookeeper.ClientCnxn: Reading reply > > > >> sessionid:0x3499df682b076cf, packet:: clientPath:null > serverPath:null > > > >> finished:false header:: 9,4 replyHeader:: 9,21519728740,-101 > > request:: > > > >> '/hbase/table/T,F response:: > > > >> 15/01/06 18:21:56 DEBUG > > > >> client.HConnectionManager$HConnectionImplementation: Removed <THAT > > > REGION> > > > >> for tableName=T from cache because of Rowx > > > >> 15/01/06 18:21:56 DEBUG > > > >> client.HConnectionManager$HConnectionImplementation: Cached location > > for > > > >> <THAT REGION> is RS_IP:60020 > > > >> 15/01/06 18:21:56 DEBUG client.ClientScanner: Advancing internal > > scanner > > > >> to startKey at 'Rowx' > > > >> > > > >> 2015-01-06 18:09 GMT+08:00 Bi,hongyu—mike <[email protected]>: > > > >> > > > >>> write traffic is ok: > > > >>> 2015-01-06 17:46:01,127 WARN > > org.apache.hadoop.hbase.ipc.SecureServer: > > > >>> (responseTooSlow): {"processingtimems":68,"call":"multi(Region=Rx > of > > > 149 > > > >>> actions and first row key= Rowx), rpc version=1, client version=29, > > > >>> methodsFingerPrint=-1105746420","client":"IP：port} > > > >>> > > > >>> scan on that region slow： > > > >>> 015-01-06 16:23:25,087 ERROR > > > >>> org.apache.hadoop.hbase.regionserver.HRegionServer: > > > >>> org.apache.hadoop.hbase.ipc.CallerDisconnectedException: Aborting > on > > > >>> region Rx, call next(8002464006782223710, 1, 0), rpc version=1, > > client > > > >>> version=29, methodsFingerPrint=-1771721648 from > 10.201.202.31:31285 > > > >>> after 87821 ms, since caller disconnected > > > >>> at > > > >>> > > > > > > org.apache.hadoop.hbase.ipc.HBaseServer$Call.throwExceptionIfCallerDisconnected(HBaseServer.java:438); > > > >>> > > > >>> hbase hfile -r 'Rx' -p can produce the result > > > >>> > > > >>> 2015-01-06 18:03 GMT+08:00 Bi,hongyu—mike <[email protected]>: > > > >>> > > > >>>> Hi all, > > > >>>> > > > >>>> There's one region which can take write request but scan； > > > >>>> If I scan on that region I'll get scanner lease timeout(60s by > > > >>>> default)，while I can scan other region of the same table and get > > the > > > >>>> result less than 10ms（our slow rpc threadhold is 10ms）； > > > >>>> > > > >>>> hbck report OK, and I use "hbase hfile" tool to check that > region's > > > >>>> storefile and the region ,which all extract the result； > > > >>>> > > > >>>> so I don't have any idea on it... > > > >>>> any help will be appreciate, many thanks! > > > >> > > > > > >
