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HBase >> mail # user >> rpc call logging

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Re: rpc call logging
Well, counts would help a lot, but actual queries displayed even more
so... For example I just found a bug in our code that runs in infinite
loop across only specific pages that cause region server CPU to
overrun.   It would be easier for us to ID the bugs if we had all
queries logged.


On Sat, Apr 9, 2011 at 6:02 PM, Ted Yu <[EMAIL PROTECTED]> wrote:
> I think HBASE-3647 was a good start but Jack asked might be a little more.
> BTW 3647 isn't in 0.90.2
> Currently regionserver.jsp displays RegionServerMetrics for every region in
> an unsorted order w.r.t. read/write request counts. For any region server in
> production, there would be hundreds of regions, it is not realistic to spot
> hot regions in the current display.
> Do we need to add capability to sort the regions on regionserver.jsp
> according to read/write request counts ?
> Cheers
> On Sat, Apr 9, 2011 at 1:59 PM, Stack <[EMAIL PROTECTED]> wrote:
>> You mean per-region Jack?
>> These went into TRUNK recently:
>>   HBASE-3647  Distinguish read and write request count in region
>>               (Ted Yu via Stack)
>>   HBASE-3704  Show per region request count in table.jsp
>>               (Ted Yu via Stack)
>> Would they help?
>> St.Ack
>> On Sat, Apr 9, 2011 at 12:22 PM, Jack Levin <[EMAIL PROTECTED]> wrote:
>> > It would be super nice to have RPC query call logging per region
>> > server.  Sometimes we have 'hot' regions getting hit by users, and
>> > this drives the CPU on a particular RS server up, except we have no
>> > idea what table it might be.  I could rig the tcpdump on port 60020,
>> > and log things with AWK, but that would be super hacky.  An insight
>> > what traffic drives the cpu will allow us (or anyone else) model the
>> > tables to user patterns accordingly.
>> >
>> > thanks.
>> >
>> > -Jack
>> >