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帮助文档（华北一、二）

我们利用 Elasticsearch 官方提供的 benchmark 压测工具 rally 对北京二的Elasticsearch集群（V5.5.1）进行测试，测试结果如下：

8C/16G 3个节点：

Metric	Operation	Value	Unit
Indexing time		31.7303	min
Merge time		9.5995	min
Refresh time		1.93053	min
Flush time		0.0881167	min
Merge throttle time		1.54493	min
Total Young Gen GC		58.079	s
Total Old Gen GC		0.196	s
Heap used for segments		18.3168	MB
Heap used for doc values		0.103638	MB
Heap used for terms		17.1259	MB
Heap used for norms		0.0717773	MB
Heap used for points		0.217482	MB
Heap used for stored fields		0.797966	MB
Segment count		94
Min Throughput	index-stats	100.045	ops/s
Median Throughput	index-stats	100.068	ops/s
Max Throughput	index-stats	100.125	ops/s
50th percentile latency	index-stats	3.61395	ms
90th percentile latency	index-stats	4.04719	ms
99th percentile latency	index-stats	4.96298	ms
99.9th percentile latency	index-stats	16.8928	ms
100th percentile latency	index-stats	23.5338	ms
Min Throughput	node-stats	100.031	ops/s
Median Throughput	node-stats	100.09	ops/s
Max Throughput	node-stats	100.506	ops/s
50th percentile latency	node-stats	4.48539	ms
90th percentile latency	node-stats	5.0753	ms
99th percentile latency	node-stats	7.10029	ms
99.9th percentile latency	node-stats	17.5065	ms
100th percentile latency	node-stats	23.1605	ms
Min Throughput	default	49.9519	ops/s
Median Throughput	default	50.013	ops/s
Max Throughput	default	50.0216	ops/s
50th percentile latency	default	15.2663	ms
90th percentile latency	default	16.0737	ms
99th percentile latency	default	18.9459	ms
99.9th percentile latency	default	40.3196	ms
100th percentile latency	default	45.0553	ms
Min Throughput	term	200.063	ops/s
Median Throughput	term	200.091	ops/s
Max Throughput	term	200.174	ops/s
50th percentile latency	term	2.59966	ms
90th percentile latency	term	3.12504	ms
99th percentile latency	term	31.4645	ms
99.9th percentile latency	term	43.7732	ms
100th percentile latency	term	45.5124	ms
Min Throughput	phrase	200.03	ops/s
Median Throughput	phrase	200.049	ops/s
Max Throughput	phrase	200.075	ops/s
50th percentile latency	phrase	3.88241	ms
90th percentile latency	phrase	5.3865	ms
99th percentile latency	phrase	44.4824	ms
Median Throughput	phrase	200.049	ops/s
Max Throughput	phrase