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From Loïc Chanel <loic.cha...@telecomnancy.net.INVALID>
Subject Re: Slow scan rate due to upgrade of HBase
Date Mon, 16 Jan 2017 11:55:30 GMT
Am I the only one here who can't see the pictures ?

System Big Data engineer
MS&T - WASABI - Worldline (Villeurbanne, France)

2017-01-16 7:33 GMT+01:00 dinesh kumar <dinesh12b@gmail.com>:

> 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

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