Cassandra节点中的高负载平均值

我们观察到4节点Cassandra集群的平均CPU负载较高。RF大多为2，我们对读写一致性级别都使用本地_1

sjk ttop输出主要显示sharedpool工作线程

2016-06-24T11:59:08.894+0000 Process summary process cpu=704.99% application cpu=712.74% (user=678.15% sys=34.60%) other: cpu=-7.75% heap allocation rate 174mb/s [387229] user=32.01% sys= 1.49% alloc= 58mb/s - CompactionExecutor:12419 [000314] user=17.52% sys=-0.17% alloc= 3136kb/s - SharedPool-Worker-3 [000317] user=17.42% sys=-0.19% alloc= 3897kb/s - SharedPool-Worker-5 [000315] user=15.90% sys= 0.52% alloc= 1546kb/s - SharedPool-Worker-4 [000313] user=15.80% sys= 0.13% alloc= 2519kb/s - SharedPool-Worker-2 [000312] user=15.70% sys= 0.09% alloc= 1826kb/s - SharedPool-Worker-1 [000316] user=13.57% sys= 0.74% alloc= 2568kb/s - SharedPool-Worker-6 [000326] user=13.57% sys= 0.08% alloc= 832kb/s - SharedPool-Worker-13 [000320] user=13.57% sys= 0.03% alloc= 3024kb/s - SharedPool-Worker-7 [000325] user=13.07% sys= 0.23% alloc= 1781kb/s - SharedPool-Worker-12 [000318] user=12.46% sys= 0.74% alloc= 2174kb/s - SharedPool-Worker-8 [000327] user=11.65% sys= 0.46% alloc= 2371kb/s - SharedPool-Worker-11 [000328] user=11.45% sys= 0.21% alloc= 1233kb/s - SharedPool-Worker-24 [000319] user=11.65% sys= 0.00% alloc= 1861kb/s - SharedPool-Worker-10 [000321] user=11.34% sys= 0.14% alloc= 1037kb/s - SharedPool-Worker-14 [000322] user=11.45% sys=-0.05% alloc= 2120kb/s - SharedPool-Worker-9 [000324] user=10.84% sys= 0.12% alloc= 1860kb/s - SharedPool-Worker-15 [000332] user=10.74% sys= 0.09% alloc= 1219kb/s - SharedPool-Worker-22 [000335] user=10.43% sys= 0.19% alloc= 956kb/s - SharedPool-Worker-19 [000323] user=10.23% sys= 0.19% alloc= 688kb/s - SharedPool-Worker-16 [000333] user=10.13% sys= 0.03% alloc= 1450kb/s - SharedPool-Worker-21 [000330] user= 9.42% sys= 0.25% alloc= 1507kb/s - SharedPool-Worker-26 [000337] user= 9.32% sys= 0.29% alloc= 780kb/s - SharedPool-Worker-17 [000334] user= 9.32% sys= 0.06% alloc= 1698kb/s - SharedPool-Worker-20 [000339] user= 9.42% sys=-0.06% alloc= 1514kb/s - SharedPool-Worker-27 [000345] user= 8.61% sys= 0.15% alloc= 510kb/s - SharedPool-Worker-34 [000329] user= 8.41% sys= 0.34% alloc= 760kb/s - SharedPool-Worker-23 [000598] user= 8.31% sys= 0.06% alloc= 1124kb/s - SharedPool-Worker-39 [000336] user= 8.20% sys= 0.12% alloc= 1895kb/s - SharedPool-Worker-18 [000590] user= 8.00% sys= 0.22% alloc= 953kb/s - SharedPool-Worker-35 2016-06-24T11:59:08.894+0000工艺总结 进程cpu=704.99% 应用程序cpu=712.74%（用户=678.15%sys=34.60%） 其他：cpu=-7.75% 堆分配速率174mb/s [387229]用户=32.01%sys=1.49%alloc=58mb/s-CompactionExecutor:12419 [000314]用户=17.52%sys=-0.17%alloc=3136kb/s-SharedPool-Worker-3 [000317]用户=17.42%sys=-0.19%alloc=3897kb/s-SharedPool-Worker-5 [000315]用户=15.90%sys=0.52%alloc=1546kb/s-共享工具-Worker-4 [000313]用户=15.80%sys=0.13%alloc=2519kb/s-共享工具-Worker-2 [000312]用户=15.70%sys=0.09%alloc=1826kb/s-共享工具-Worker-1 [000316]用户=13.57%sys=0.74%alloc=2568kb/s-共享工具-Worker-6 [000326]用户=13.57%sys=0.08%alloc=832kb/s-共享工具-Worker-13 [000320]用户=13.57%sys=0.03%alloc=3024kb/s-共享工具-Worker-7 [000325]用户=13.07%sys=0.23%alloc=1781kb/s-共享工具-Worker-12 [000318]用户=12.46%sys=0.74%alloc=2174kb/s-SharedPool-Worker-8 [000327]用户=11.65%sys=0.46%alloc=2371kb/s-SharedPool-Worker-11 [000328]用户=11.45%sys=0.21%alloc=1233kb/s-共享工具-Worker-24 [000319]用户=11.65%sys=0.00%alloc=1861kb/s-共享工具-Worker-10 [000321]用户=11.34%sys=0.14%alloc=1037kb/s-SharedPool-Worker-14 [000322]用户=11.45%sys=-0.05%alloc=2120kb/s-SharedPool-Worker-9 [000324]用户=10.84%sys=0.12%alloc=1860kb/s-共享工具-Worker-15 [000332]用户=10.74%sys=0.09%alloc=1219kb/s-共享工具-Worker-22 [000335]用户=10.43%sys=0.19%alloc=956kb/s-共享工具-Worker-19 [000323]用户=10.23%sys=0.19%alloc=688kb/s-SharedPool-Worker-16 [000333]用户=10.13%sys=0.03%alloc=1450kb/s-共享工具-Worker-21 [000330]用户=9.42%sys=0.25%alloc=1507kb/s-SharedPool-Worker-26 [000337]用户=9.32%sys=0.29%alloc=780kb/s-SharedPool-Worker-17 [000334]用户=9.32%sys=0.06%alloc=1698kb/s-共享工具-Worker-20 [000339]用户=9.42%sys=-0.06%alloc=1514kb/s-SharedPool-Worker-27 [000345]用户=8.61%sys=0.15%alloc=510kb/s-SharedPool-Worker-34 [000329]用户=8.41%sys=0.34%alloc=760kb/s-共享工具-Worker-23 [000598]用户=8.31%sys=0.06%alloc=1124kb/s-共享工具-Worker-39 [000336]用户=8.20%sys=0.12%alloc=1895kb/s-共享工具-Worker-18 [000590]用户=8.00%sys=0.22%alloc=953kb/s-共享工具-Worker-35

群集中的读写请求包括：

---

我正在寻找如何进一步调试高负载的建议。在决定扩展集群之前，我想消除任何调优可能性。

DSE v4.8.5，Cassandra 2.1.13。