Am I the only one here who can't see the pictures ? Loïc CHANEL System Big Data engineer MS&T - WASABI - Worldline (Villeurbanne, France)
2017-01-16 7:33 GMT+01:00 dinesh kumar <[email protected]>: > Hi, > Recently we upgraded our HBase cluster from 0.98.6-cdh5.3.0 > to 1.2.0-cdh5.8.3. The clients were also upgraded to use the new version of > the client library (1.2.0-cdh5.8.3). This caused a considerable decrease > in the scan speed in our apps. But when we switched the client to use an > old version (0.98.6-cdh5.3.0) of the client library to scan the new HBase > cluster (1.2.0-cdh5.8.3) we were able to get the old performance on scans. > It was made sure that there was no resource pressure on the HBase server > machines (both CPU load average and Free memory was monitored) > > To understand this better, we profiled the app that was calling the scans > with both the old (0.98.6-cdh5.3.0) and new (1.2.0-cdh5.8.3) HBase client > libraries (HBase server version: 1.2.0-cdh5.8.3) > > > Client Profile using Old HBase client library > > [image: Inline images 1] > > > Client Profile using New HBase client library > > [image: Inline images 2] > > There seems to be a difference in the call stack while making rpc calls to > the servers for scans. > > Can someone help shed some light on the performance difference between the > old and new client jar? Is there any configuration we should enable in the > new jar that will enable/disable some feature that we are not aware of? > > Thanks, > Dinesh >
