No one advice did't help to me for reduce GC load I tried these:
MAX_HEAP_SIZE from default(8GB) to 16G with HEAP_NEWSIZE from 400M to 9600M
key cache on/off
compacting memory size and other limits
15 c3.4xlarge nodes (adding 5 nodes to 10 nodes cluster did't help):
and many other
Reads ~5000 ops/s
Writes ~ 5000 ops/s
max batch is 50
heavy reads and heavy writes (and heavy deletes)
sometimes i have message:
Read 1001 live and 2691
Read 12 live and 2796
sudo jstat -gcutil -h15 `sudo cat /var/run/cassandra/cassandra.pid` 250ms 0
S0 S1 E O P YGC YGCT FGC FGCT GCT
18.93 0.00 4.52 75.36 59.77 225 30.119 18 28.361 58.480
0.00 13.12 3.78 81.09 59.77 226 30.193 18 28.617 58.810
0.00 13.12 39.50 81.09 59.78 226 30.193 18 28.617 58.810
0.00 13.12 80.70 81.09 59.78 226 30.193 18 28.617 58.810
17.21 9.13 0.66 87.38 59.78 228 30.235 18 28.617 58.852
0.00 10.96 29.43 87.89 59.78 228 30.328 18 28.617 58.945
0.00 10.96 62.67 87.89 59.78 228 30.328 18 28.617 58.945
0.00 10.96 96.62 87.89 59.78 228 30.328 18 28.617 58.945
0.00 10.69 10.29 94.56 59.78 230 30.462 18 28.617 59.078
0.00 10.69 38.08 94.56 59.78 230 30.462 18 28.617 59.078
0.00 10.69 71.70 94.56 59.78 230 30.462 18 28.617 59.078
15.91 6.24 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
S0 S1 E O P YGC YGCT FGC FGCT GCT
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
15.91 8.02 0.03 99.96 59.78 232 30.506 18 28.617 59.123
$ nodetool cfhistograms Social home_timeline
Social/home_timeline histograms
Offset SSTables Write Latency Read Latency Partition Size
Cell Count
(micros) (micros) (bytes)
1 10458 0 0 0
26330
2 72428 0 0 0
0
3 339490 11 0 0
42398
4 661819 156 0 0
0
5 67186 893 0 0
0
6 33284 3064 0 0
15907
7 41287 10542 0 0
0
8 49085 34689 0 0
0
10 82941 244013 0 0
19068
12 49438 523284 0 0
17726
14 45109 724026 0 0
0
17 69144 1181873 0 0
18888
20 52563 1039934 0 0
9859
24 63041 1007711 0 0
16223
29 53042 702118 34 0
6289
35 31725 395098 78 0
10434
42 25571 212531 81 0
13735
50 11984 120692 69 0
8020
60 3985 71142 51 0
12874
72 4681 44988 52 0
10466
86 0 31096 50 12336
9162
103 0 25435 41 0
11421
124 0 20666 35 0
11204
149 0 17810 42 4799
9953
179 0 18568 45 22462
12347
215 0 20129 89 1492
12628
258 0 26381 174 6605
13687
310 0 34731 412 19060
12978
372 0 58609 577 3848
17080
446 0 59318 1355 9504
13231
535 0 16462 2778 10685
13791
642 0 9985 6555 13931
12703
770 0 6403 14811 16859
11261
924 0 4149 34059 12032
12311
1109 0 3910 77621 8868
11829
1331 0 3617 154224 12096
12886
1597 0 3400 234929 10006
11738
1916 0 3156 264185 9443
11546
2299 0 2862 199240 10557
12011
2759 0 2548 145502 10370
12039
3311 0 1809 125259 10600
14861
3973 0 1401 83855 10081
13866
4768 0 1035 69407 10028
13341
5722 0 795 55982 10594
12707
6866 0 688 47374 10450
11429
8239 0 338 37722 10608
10324
9887 0 277 34395 12180
9418
11864 0 255 31126 12896
8542
14237 0 223 25607 12829
7796
17084 0 178 20661 15812
6803
20501 0 193 15916 15590
6128
24601 0 198 12606 14920
5290
29521 0 186 11137 14068
4598
35425 0 195 11111 14377
3891
42510 0 138 9597 14468
3439
51012 0 123 7032 14298
2701
61214 0 413 5288 15194
2333
73457 0 1911 3991 13549
1942
88148 0 940 3392 13178
1595
105778 0 427 3045 12835
1234
126934 0 431 2691 12676
1080
152321 0 987 2504 15068
787
182785 0 484 2337 14566
600
219342 0 595 2052 13664
516
263210 0 480 1736 13538
377
315852 0 428 1428 12007
316
379022 0 367 1093 10802
240
454826 0 330 816 9819
172
545791 0 285 555 8931
155
654949 0 240 339 8153
121
785939 0 168 201 7212
99
943127 0 154 103 6477
64
1131752 0 141 89 5693
65
1358102 0 135 87 4885
51
1629722 0 97 66 4210
42
1955666 0 88 18 3689
38
2346799 0 78 7 3027
18
2816159 0 73 21 2528
23
3379391 0 120 54 2104
11
4055269 0 70 107 1797
7
4866323 0 118 37 1429
3
5839588 0 56 73 1155
3
7007506 0 31 52 895
4
8409007 0 36 52 678
3
10090808 0 29 4 614
4
12108970 0 34 17 402
2
14530764 0 31 7 369
3
17436917 0 22 47 229
2
20924300 0 20 1 195
0
25109160 0 34 36 154
1
I'm at an impasse.
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