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From Andrey Ilinykh <ailin...@gmail.com>
Subject Re: cfhistograms
Date Mon, 25 Mar 2013 17:23:13 GMT
What I don't understand hete is "Row Size" column. Why is it  always 0?

Thank you,
   Andrey


On Mon, Mar 25, 2013 at 9:36 AM, Brian Tarbox <tarbox@cabotresearch.com>wrote:

> I think we all go through this learning curve.  Here is the answer I gave
> last time this question was asked:
>
> The output of this command seems to make no sense unless I think of it as
> 5 completely separate histograms that just happen to be displayed
> together.
>
> Using this example output should I read it as: my reads all took either 1
> or 2 sstable.  And separately, I had write latencies of 3,7,19.  And
> separately I had read latencies of 2, 8,69, etc?
>
> In other words...each row isn't really a row...i.e. on those 16033 reads
> from a single SSTable I didn't have 0 write latency, 0 read latency, 0 row
> size and 0 column count.  Is that right?
>
> Offset      SSTables     Write Latency      Read Latency          Row Size
>      Column Count
> 1              16033             0                            0
>                  0                 0
> 2                303               0                            0
>                    0                 1
> 3                  0                 0                            0
>                      0                 0
> 4                  0                 0                            0
>                      0                 0
> 5                  0                 0                            0
>                      0                 0
> 6                  0                 0                            0
>                      0                 0
> 7                  0                 0                            0
>                      0                 0
> 8                  0                 0                            2
>                      0                 0
> 10                 0                 0                            0
>                      0              6261
> 12                 0                 0                            2
>                      0               117
> 14                 0                 0                            8
>                      0                 0
> 17                 0                 3                           69
>                      0               255
> 20                 0                 7                          163
>                      0                 0
> 24                 0                19                         1369
>                      0                 0
>
>
> On Mon, Mar 25, 2013 at 11:52 AM, Kanwar Sangha <kanwar@mavenir.com>wrote:
>
>>  Can someone explain how to read the cfhistograms o/p ?****
>>
>> ** **
>>
>> [root@db4 ~]# nodetool cfhistograms usertable data****
>>
>> usertable/data histograms****
>>
>> Offset      SSTables     Write Latency      Read Latency          Row
>> Size      Column Count****
>>
>> 1            2857444              4051                 0
>> 0                             342711****
>>
>> 2            6355104             27021                 0
>>    0                                          201313****
>>
>> 3            2579941             61600                 0
>> 0                                          130489****
>>
>> 4             374067            119286                 0
>> 0             91378****
>>
>> 5               9175            210934                 0
>> 0             68548****
>>
>> 6                  0            321098                 0
>> 0             54479****
>>
>> 7                  0            476677                 0
>> 0             45427****
>>
>> 8                  0            734846                 0
>> 0             38814****
>>
>> 10                 0           2867967                 4
>> 0             65512****
>>
>> 12                 0           5366844                22
>> 0             59967****
>>
>> 14                 0           6911431                36
>> 0             63980****
>>
>> 17                 0          10155740               127
>> 0            115714****
>>
>> 20                 0           7432318               302
>>   0            138759****
>>
>> 24                 0           5231047               969
>> 0            193477****
>>
>> 29                 0           2368553              2790
>> 0            209998****
>>
>> 35                 0            859591              4385
>> 0            204751****
>>
>> 42                 0            456978              3790
>> 0            214658****
>>
>> 50                 0            306084              2465
>> 0            151838****
>>
>> 60                 0            223202              2158
>> 0             40277****
>>
>> 72                 0            122906              2896
>> 0              1735****
>>
>> ** **
>>
>> ** **
>>
>> Thanks****
>>
>> Kanwar****
>>
>> ** **
>>
>
>

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