Hi I am using YCSB to measure the performance of some complex Get/Scan,
i.e., with some filters. I found that I got weird high latency from YCSB
client but both HBase server and YCSB client are NOT saturated (in terms
of network, I/O, CPU). So I want to measure the server time a single
Get/Scan takes.

Is there a way to do it? From the documentation it seems that RPC logging
is a place to look but the semantics of the logging is not well-documented
so I wonder 1) if RPC logging is the right approach and 2) how I can
interpret it correctly.
Thanks!
Best Regards,
Wei

Hmm... I appreciate it if anybody can point me how to measure server side
Get/Scan time... Thanks!
Best Regards,
Wei
From:   Wei Tan/Watson/IBM
To:     [EMAIL PROTECTED],
Date:   12/02/2012 12:21 PM
Subject:        Meaure server time of Get/Scan - through RPC logging?
Hi I am using YCSB to measure the performance of some complex Get/Scan,
i.e., with some filters. I found that I got weird high latency from YCSB
client but both HBase server and YCSB client are NOT saturated (in terms
of network, I/O, CPU). So I want to measure the server time a single
Get/Scan takes.

Is there a way to do it? From the documentation it seems that RPC logging
is a place to look but the semantics of the logging is not well-documented
so I wonder 1) if RPC logging is the right approach and 2) how I can
interpret it correctly.
Thanks!
Best Regards,
Wei

The scan are done in parallel in many region servers and are specific
to your query, so I don't think any jmx counter can help you.
Maybe you measure it using your own Region Observer on Pre/Post Scan,
and writing it to a shared log file on hdfs.

Sent from my iPhone

On 9 בדצמ 2012, at 04:41, Wei Tan <[EMAIL PROTECTED]> wrote:

> Hmm... I appreciate it if anybody can point me how to measure server side
> Get/Scan time... Thanks!
>
>
> Best Regards,
> Wei
>
>
>
>
> From:   Wei Tan/Watson/IBM
> To:     [EMAIL PROTECTED],
> Date:   12/02/2012 12:21 PM
> Subject:        Meaure server time of Get/Scan - through RPC logging?
>
>
> Hi I am using YCSB to measure the performance of some complex Get/Scan,
> i.e., with some filters. I found that I got weird high latency from YCSB
> client but both HBase server and YCSB client are NOT saturated (in terms
> of network, I/O, CPU). So I want to measure the server time a single
> Get/Scan takes.
>
> Is there a way to do it? From the documentation it seems that RPC logging
> is a place to look but the semantics of the logging is not well-documented
> so I wonder 1) if RPC logging is the right approach and 2) how I can
> interpret it correctly.
>
>
> Thanks!
>
>
> Best Regards,
> Wei
>