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From mcasandra <mohitanch...@gmail.com>
Subject Re: Timeout during stress test
Date Tue, 12 Apr 2011 17:06:19 GMT
Here is what cfhistograms look like. Don't really understand what this means,
will try to read. I also %util in iostat continuously 90%. Not sure if this
is caused by extra reads by cassandra. It seems unusual.

[root@dsdb4 ~]# nodetool -h `hostname` cfhistograms StressKeyspace
StressStandard
StressKeyspace/StressStandard histograms
Offset      SSTables     Write Latency      Read Latency          Row Size     
Column Count
1              45720                 0                 0                 0           
498857
2                  0                 0                 0                 0               

0
3                  0                 0                 0                 0               

0
4                  0                 0                 0                 0               

0
5                  0                 0                 0                 0               

0
6                  0                 0                 1                 0               

0
7                  0                 0                 1                 0               

0
8                  0                 0                 0                 0               

0
10                 0                 0                 0                 0               

0
12                 0                 0                 0                 0               

0
14                 0                 0                 0                 0               

0
17                 0                 1                 0                 0               

0
20                 0                 2                 0                 0               

0
24                 0                 1                 0                 0               

0
29                 0                 6                 0                 0               

0
35                 0                68                 0                 0               

0
42                 0               509                 0                 0               

0
50                 0              1128                 0                 0               

0
60                 0              1449                 0                 0               

0
72                 0               789                 0                 0               

0
86                 0               400                 0                 0               

0
103                0               319                 0                 0               

0
124                0               388                 0                 0               

0
149                0               456                 0                 0               

0
179                0               519                 0                 0               

0
215                0               262                 0                 0               

0
258                0               194                 0                 0               

0
310                0                48                 0                 0               

0
372                0                 5                 0                 0               

0
446                0                 1                 0                 0               

0
535                0                 0                 0                 0               

0
642                0                 0                 0                 0               

0
770                0                 1                 0                 0               

0
924                0                 1                 0                 0               

0
1109               0                 0                 0                 0               

0
1331               0                 1                 0                 0               

0
1597                                 0                 0                 0               

0
1916                                 1                 0                 0               

0
2299                                 0                 0                 0               

0
2759                                 0                 0                 0               

0
3311                                 0                 0                 0               

0
3973                                 1                 0                 0               

0
4768                                 5                 0                 0               

0
5722                                19                 0                 0               

0
6866                                46                 0                 0               

0
8239                               102                 0                 0               

0
9887                               226                 0                 0               

0
11864                              368                 0                 0               

0
14237                              572                 0                 0               

0
17084                              690                 0                 0               

0
20501                              960                 0                 0               

0
24601                             1272                 0                 0               

0
29521                             1734                 0                 0               

0
35425                             2262                 0                 0               

0
42510                             2734                 0                 0               

0
51012                             3098                 0                 0               

0
61214                             3426                 0                 0               

0
73457                             3879                 0                 0               

0
88148                             4157                 0                 0               

0
105778                            4065                 0                 0               

0
126934                            3804                 0                 0               

0
152321                            2828                 0                 0               

0
182785                            1699                 0                 0               

0
219342                             821                 0                 0               

0
263210                             300                 0            249214               

0
315852                              88                 0            149731               

0
379022                              12                 0                 0               

0
454826                               3                 0                 0               

0
545791                               0                 0                 0               

0
654949                               0                 0                 0               

0
785939                               0                 0                 0               

0
943127                               0                 0             74915               

0
1131752                              0                 0                 0               

0
1358102                              0                 0                 0               

0
1629722                              0                 0                 0               

0
1955666                              0                 0                 0               

0
2346799                              0                 0                 0               

0
2816159                              0                 0                 0               

0
3379391                              0                 0             22438               

0
4055269                              0                 0                 0               

0
4866323                              0                 0                 0               

0
5839588                              0                 0              2559               

0
7007506                              0                 0                 0               

0
8409007                              0                 0                 0               

0
10090808                             0                 0                 0               

0
12108970                             0                 0                 0               

0
14530764                             0                 0                 0               

0
17436917                             0                 0                 0               

0
20924300                             0                 0                 0               

0
25109160                             0                 0                 0               

0


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