But with 200 threads, the problem is back. =\ On Sat, May 9, 2009 at 8:44 PM, Guilherme Germoglio <[email protected]>wrote:
> maybe you've just spotted the problem! I've raised > hbase.regionserver.handler.count to 100 and the threads are now executing > much faster! When 20 are running, they take about 80~90 ms each. > > > On Sat, May 9, 2009 at 8:36 PM, Ryan Rawson <[email protected]> wrote: > >> if we had a compare and set operation would this help you? >> >> Another thing, normally hbase regionserver only runs 10 ipc handler >> threads... I'm not sure how relevant or important this is yet. Holding a >> row >> open should not tie up an ipc thread though. >> >> On May 9, 2009 4:19 PM, "Guilherme Germoglio" <[email protected]> >> wrote: >> >> Hey Ryan, >> >> Thank for such a quick response! >> >> The log is here: http://germoglio.googlepages.com/log.zip Unfortunately, >> I >> wasn't running with debug on. I'll do it tomorrow in order to get more >> data >> (Will I be able to find how to turn on debug in the mailing list archives >> or >> in hbase wiki?). Also, you will notice that the log is only from the >> master >> server. The reason for this is that I'm running on the pseudodistributed >> mode and the region server log has only one message "2009-05-09 >> 19:04:26,242 >> WARN org.apache.hadoop.hbase.regionserver.HRegionServer: Not starting a >> distinct region server because hbase.master is set to 'local' mode". >> >> Thank you for the advice. I understand that a simple put doesn't make >> sense >> to lock a row. However, I'm just considering the performance of it. If the >> put operation into a single row (which I think is the fastest operation) >> isn't fast enough for my project, I'll not even try what I'm really >> intending to do, which is atomically getting a value, modifying it (not >> necessarily incrementing it), and then putting it back to the table. >> >> I wasn't expecting great performance either, but is it ok to execute a >> single put into a locked row in 5~10 minutes? >> >> On Sat, May 9, 2009 at 7:54 PM, Ryan Rawson <[email protected]> wrote: > >> Hey Guilherme, > > We'd ... >> -- >> >> Guilherme msn: [email protected] homepage: >> http://germoglio.googlepages.com >> > > > > -- > Guilherme > > msn: [email protected] > homepage: http://germoglio.googlepages.com > -- Guilherme msn: [email protected] homepage: http://germoglio.googlepages.com
