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References
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Current Instance Configuration
As per the current configuration,
We have single cluster - exposed using
CPS_NCMP_CACHES_CLUSTER_NAMEand defaults tocps-and-ncmp-common-cache-clusterEach data structure has its own instance per JVM. So for the below case we have 6 instance per JVM.
Data Structure Name | Configuration Name | Instance Name | |
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Target Instance Configuration
What I want to achieve,
Cluster would still be the same but want to limit the number of instances.
We will have a single Hazelcast instance that has all the configurations of different data structures and we can get hold off a datastructure when needed using that instance.
It will be a single instance per JVM.
How we can achieve,
By having a common configuration i.e master configuration for all the type of data structure that we need. We still have same config. but we are giving it different names everytime.
CPS_NCMP_INSTANCE_CONFIG_NAME is the environment variable to set the common config name and it defaults to cps-and-ncmp-hz-instance-config.
During initialization check if the configuration is present or not, if present return the initialized instance to get hold off the required data structures.
Impacts
There would be just one member per JVM now as opposed to 6 instances per JVM.
For multiple instance setup , lets say 2 instances , with new setup we will have 2 members as opposed to 12 members.
Less members , less number of TCP connections in between them.
More members , more chatty the members are in order to replicate the data or choose the leader partition etc.
Less members meaning less data to replicate , and since everything is in memory hence expecting some heap space to be free.
Number of exposed ports should be just one per JVM as opposed to 6 per JVM. ( may need to change the charts config to free up the exposed ports )
Performance Results
Before change
Parameter | Instance#1 | Instance#2 |
|---|---|---|
Max Heap Usage | 706MB | 869MB |
Max Number of Threads | 330 | 324 |
Max CPU Usage | 99.2% | 88.6% |
Startup Time | 45secs | 55secs |
After change
Parameter | Instance#1 | Instance#2 |
|---|---|---|
Max Heap Usage | 989MB | 898MB |
Max Number of Threads | 118 | 118 |
Max CPU Usage | 100% | 100% |
Startup Time | 18secs | 28secs |
K6 Performance Comparison
# | Test Name | Unit | Fs Requirement | Current Expectation | Actual(before_fix) | Actual(after_fix) | %Change |
|---|---|---|---|---|---|---|---|
0 | HTTP request failures for all tests | rate of failed requests | 0 | 0 | 0 | 0 | 0% |
1 | Registration of CM-handles | CM-handles/second | 22 | 110 | 236.678 | 222.497 | -6% |
2 | De-registration of CM-handles | CM-handles/second | 22 | 90 | 394.921 | 411.514 | 4% |
3a | CM-handle ID search with No filter | milliseconds | 2000 | 400 | 540.934 | 177.376 | -205% |
3b | CM-handle ID search with Module filter | milliseconds | 2000 | 200 | 276.204 | 88.233 | -213% |
3c | CM-handle ID search with Property filter | milliseconds | 2000 | 1300 | 1384.904 | 451.196 | -207% |
3d | CM-handle ID search with Cps Path filter | milliseconds | 2000 | 1300 | 1406.466 | 449.769 | -213% |
3e | CM-handle ID search with Trust Level filter | milliseconds | 2000 | 10000 | 10553.261 | 2107.99 | -401% |
4a | CM-handle search with No filter | milliseconds | 15000 | 14000 | 14407.047 | 3313.815 | -335% |
4b | CM-handle search with Module filter | milliseconds | 15000 | 16000 | 16569.609 | 3963.851 | -318% |
4c | CM-handle search with Property filter | milliseconds | 15000 | 16000 | 17245.757 | 4277.553 | -303% |
4d | CM-handle search with Cps Path filter | milliseconds | 15000 | 16000 | 5188.456 | 4306.489 | -20% |
4e | CM-handle search with Trust Level filter | milliseconds | 15000 | 26000 | 26429.774 | 5939.964 | -345% |
5a | NCMP overhead for Synchronous single CM-handle pass-through read | milliseconds | 40 | 30 | 745.818 | 16.33 | -4467% |
5b | NCMP overhead for Synchronous single CM-handle pass-through read with alternate id | milliseconds | 40 | 60 | 780.423 | 26.794 | -2813% |
6a | NCMP overhead for Synchronous single CM-handle pass-through write | milliseconds | 40 | 30 | 1606.115 | 17.382 | -9140% |
6b | NCMP overhead for Synchronous single CM-handle pass-through write with alternate id | milliseconds | 40 | 60 | 1639.396 | 29.645 | -5430% |
7 | Legacy batch read operation | events/second | 150 | 1500 | 5771.839 | 3882.515 | -49% |